This is the first merge from main into MPI branch

Merge branch 'main' into local-MPI
2025-07-28 03:27:05 +00:00 · 2025-05-03 16:40:46 +03:30
parent 3d0f31a2b2 ab856e1df2
commit 14731a6c31
578 changed files with 118959 additions and 28494 deletions
--- a/src/Interaction/CMakeLists.txt
+++ b/src/Interaction/CMakeLists.txt
@ -21,6 +21,12 @@ interaction/interaction.cpp
 sphereInteraction/sphereInteractionsLinearModels.cpp
 sphereInteraction/sphereInteractionsNonLinearModels.cpp
 sphereInteraction/sphereInteractionsNonLinearModModels.cpp
+
+grainInteraction/grainInteractionsLinearModels.cpp
+grainInteraction/grainInteractionsNonLinearModels.cpp
+grainInteraction/grainInteractionsNonLinearModModels.cpp
+
+
 )

 if(pFlow_Build_MPI)
--- a/src/Interaction/Models/contactForce/cGAbsoluteLinearCF.hpp
+++ b/src/Interaction/Models/contactForce/cGAbsoluteLinearCF.hpp
@ -0,0 +1,339 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __cGAbsoluteLinearCF_hpp__
+#define __cGAbsoluteLinearCF_hpp__
+
+#include "types.hpp"
+#include "symArrays.hpp"
+
+
+namespace pFlow::cfModels
+{
+
+template<bool limited=true>
+class cGAbsoluteLinear
+{
+public:
+
+	struct contactForceStorage
+	{
+		realx3 overlap_t_ = 0.0;
+	};
+	
+	
+	struct linearProperties
+	{		
+		real 	kn_ 	= 1000.0;
+		real 	kt_	= 800.0;
+		real 	en_ 	= 0.0;
+		real 	ethat_ 	= 0.0;
+		real    mu_ 	= 0.00001;
+
+		INLINE_FUNCTION_HD
+		linearProperties(){}
+
+		INLINE_FUNCTION_HD
+		linearProperties(real kn, real kt, real en, real etha_t, real mu ):
+			kn_(kn), kt_(kt), en_(en),ethat_(etha_t), mu_(mu) 
+		{}		
+
+		INLINE_FUNCTION_HD
+		linearProperties(const linearProperties&)=default;
+
+		INLINE_FUNCTION_HD
+		linearProperties& operator=(const linearProperties&)=default;
+
+		INLINE_FUNCTION_HD
+		~linearProperties() = default;
+	};
+	
+	
+
+protected:
+
+	using LinearArrayType = symArray<linearProperties>;
+	
+	int32 					numMaterial_ = 0;
+
+	ViewType1D<real>  		 rho_;
+
+	LinearArrayType  	linearProperties_;
+	
+	int32 		addDissipationModel_;	
+	
+
+	bool readLinearDictionary(const dictionary& dict)
+	{
+	
+		
+		auto kn = dict.getVal<realVector>("kn");
+		auto kt = dict.getVal<realVector>("kt");
+		auto en = dict.getVal<realVector>("en");
+		auto et = dict.getVal<realVector>("et");
+		auto mu = dict.getVal<realVector>("mu");
+
+		auto nElem = kn.size();
+
+		if(nElem != kt.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and kt("<<kt.size()<<") do not match.\n";
+			return false;
+		}
+
+		if(nElem != kt.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and kt("<<kt.size()<<") do not match.\n";
+			return false;
+		}
+
+		if(nElem != en.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and en("<<en.size()<<") do not match.\n";
+			return false;
+		}
+
+		if(nElem != et.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and et("<<et.size()<<") do not match.\n";
+			return false;
+		}
+
+		if(nElem != mu.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and mu("<<mu.size()<<") do not match.\n";
+			return false;
+		}
+
+		
+		// check if size of vector matchs a symetric array
+		uint32 nMat;
+		if( !LinearArrayType::getN(nElem, nMat) )
+		{
+			fatalErrorInFunction<<
+			"sizes of properties do not match a symetric array with size ("<<
+			numMaterial_<<"x"<<numMaterial_<<").\n";
+			return false;
+		}
+		else if( numMaterial_ != nMat)
+		{
+			fatalErrorInFunction<<
+			"size mismatch for porperties. \n"<<
+			"you supplied "<< numMaterial_<<" items in materials list and "<<
+			nMat << " for other properties.\n";
+			return false;
+		}
+
+
+		realVector etha_t("etha_t", nElem);
+
+		ForAll(i , kn)
+		{
+
+			etha_t[i] = -2.0*log( et[i])*sqrt(kt[i]*2/7) /
+					sqrt(log(pow(et[i],2))+ pow(Pi,2));
+		}
+
+		Vector<linearProperties> prop("prop", nElem);
+		ForAll(i,kn)
+		{
+			prop[i] = {kn[i], kt[i], en[i], etha_t[i], mu[i] };
+		}
+
+		linearProperties_.assign(prop);
+		
+		auto adm = dict.getVal<word>("additionalDissipationModel");
+
+		
+		if(adm == "none")
+		{
+			addDissipationModel_ = 1;
+		}
+		else if(adm == "LU")
+		{
+			addDissipationModel_ = 2;
+		}
+		else if (adm == "GB")
+		{
+			addDissipationModel_ = 3;
+		}
+		else
+		{
+			addDissipationModel_ = 1;
+		}
+		
+		return true;
+
+	}
+
+	static const char* modelName()
+	{
+		if constexpr (limited)
+		{
+			return "cGAbsoluteLinearLimited";
+		}
+		else
+		{
+			return "cGAbsoluteLinearNonLimited";
+		}
+		return "";
+	}
+
+public:
+
+
+	TypeInfoNV(modelName());
+
+	INLINE_FUNCTION_HD
+	cGAbsoluteLinear(){}
+
+	cGAbsoluteLinear(int32 nMaterial, const ViewType1D<real>& rho, const dictionary& dict)
+	:
+		numMaterial_(nMaterial),
+		rho_("rho",nMaterial),
+		linearProperties_("linearProperties",nMaterial)
+	{
+
+		Kokkos::deep_copy(rho_,rho);
+		if(!readLinearDictionary(dict))
+		{
+			fatalExit;
+		}
+	}
+	
+	INLINE_FUNCTION_HD
+	cGAbsoluteLinear(const cGAbsoluteLinear&) = default;
+
+	INLINE_FUNCTION_HD
+	cGAbsoluteLinear(cGAbsoluteLinear&&) = default;
+
+	INLINE_FUNCTION_HD
+	cGAbsoluteLinear& operator=(const cGAbsoluteLinear&) = default;
+
+	INLINE_FUNCTION_HD
+	cGAbsoluteLinear& operator=(cGAbsoluteLinear&&) = default;
+
+
+	INLINE_FUNCTION_HD
+	~cGAbsoluteLinear()=default;
+
+	INLINE_FUNCTION_HD
+	int32 numMaterial()const
+	{
+		return numMaterial_;
+	}
+
+	//// - Methods
+	INLINE_FUNCTION_HD
+	void contactForce
+	(
+		const real dt,
+		const uint32 i,
+		const uint32 j,
+		const uint32 propId_i,
+		const uint32 propId_j,
+		const real Ri,
+		const real Rj,
+		const real cGFi,
+		const real cGFj,
+		const real ovrlp_n,
+		const realx3& Vr,
+		const realx3& Nij,
+		contactForceStorage& history,
+		realx3& FCn,
+		realx3& FCt
+	)const
+	{
+
+		
+		auto prop = linearProperties_(propId_i,propId_j);		
+
+
+		real f_ = ( cGFi + cGFj )/2 ;
+
+
+		real vrn = dot(Vr, Nij);	
+		realx3 Vt = Vr - vrn*Nij;
+
+		history.overlap_t_ += Vt*dt;
+
+		real mi = 3*Pi/4*pow(Ri,3)*rho_[propId_i];
+		real mj = 3*Pi/4*pow(Rj,3)*rho_[propId_j];
+
+		real sqrt_meff = sqrt((mi*mj)/(mi+mj));
+
+
+		// disipation model
+		if (addDissipationModel_==2)
+		{
+			prop.en_ = sqrt(1+((pow(prop.en_,2)-1)*f_));
+		}
+		else if (addDissipationModel_==3)
+		{
+			auto pie =3.14;
+			prop.en_ = exp((pow(f_,static_cast<real>(1.5))*log(prop.en_)*sqrt( (1-((pow(log(prop.en_),2))/(pow(log(prop.en_),2)+pow(pie,2))))/(1-(pow(f_,3)*(pow(log(prop.en_),2))/(pow(log(prop.en_),2)+pow(pie,2)))) ) ));
+		}
+
+		real ethan_  = -2.0*log(prop.en_)*sqrt(prop.kn_)/
+					sqrt(pow(log(prop.en_),2)+ pow(Pi,2));
+
+			//REPORT(0)<<"\n en n is  :  "<<END_REPORT;
+			//REPORT(0)<< prop.en_ <<END_REPORT;
+
+		FCn = (  -pow(f_,3)*prop.kn_ * ovrlp_n - sqrt_meff * pow(f_,static_cast<real>(1.5)) * ethan_ * vrn)*Nij;
+		FCt = ( -pow(f_,3)*prop.kt_ * history.overlap_t_ - sqrt_meff * pow(f_,static_cast<real>(1.5)) *  prop.ethat_*Vt);
+				
+		real ft = length(FCt);
+		real ft_fric = prop.mu_ * length(FCn);
+		
+		if(ft > ft_fric)
+		{
+			if( length(history.overlap_t_) >zero)
+			{
+				if constexpr (limited)
+				{
+					FCt *= (ft_fric/ft);
+                	history.overlap_t_ = - (FCt/prop.kt_);
+				}
+				else
+				{
+					FCt = (FCt/ft)*ft_fric;	
+				}
+				//cout<<"friction is applied here \n";
+				
+			}
+			else
+			{
+				FCt = 0.0;
+			}
+		}
+
+	}
+	
+};
+
+} //pFlow::cfModels
+
+#endif
--- a/src/Interaction/Models/contactForce/cGNonLinearCF.hpp
+++ b/src/Interaction/Models/contactForce/cGNonLinearCF.hpp
@ -0,0 +1,307 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __cGNonLinearCF_hpp__
+#define __cGNonLinearCF_hpp__
+
+#include "types.hpp"
+
+namespace pFlow::cfModels
+{
+
+template<bool limited=true>
+class cGNonLinear
+{
+public:
+
+	struct contactForceStorage
+	{
+		realx3 overlap_t_ = 0.0;
+	};
+
+	struct cGNonLinearProperties
+	{		
+		real 	Yeff_	= 1000000.0;
+		real 	Geff_	= 8000000.0;
+		real 	en_ 	= 1.0;
+		real  	mu_ 	= 0.00001;
+
+		INLINE_FUNCTION_HD
+		cGNonLinearProperties(){}
+
+		INLINE_FUNCTION_HD
+		cGNonLinearProperties(real Yeff, real Geff, real en, real mu ):
+			Yeff_(Yeff), Geff_(Geff), en_(en), mu_(mu)
+		{}		
+
+		INLINE_FUNCTION_HD
+		cGNonLinearProperties(const cGNonLinearProperties&)=default;
+
+		INLINE_FUNCTION_HD
+		cGNonLinearProperties& operator=(const cGNonLinearProperties&)=default;
+
+		INLINE_FUNCTION_HD
+		~cGNonLinearProperties() = default;
+	};
+
+protected:
+
+	using cGNonLinearArrayType = 	symArray<cGNonLinearProperties>;
+
+	int32 						numMaterial_ = 0;
+
+	ViewType1D<real>  		 	rho_;
+
+	int32 						addDissipationModel_;
+
+	cGNonLinearArrayType  		nonlinearProperties_;
+
+	bool readNonLinearDictionary(const dictionary& dict)
+	{
+		auto Yeff = dict.getVal<realVector>("Yeff");
+		auto Geff = dict.getVal<realVector>("Geff");
+		auto nu = dict.getVal<realVector>("nu");
+		auto en = dict.getVal<realVector>("en");
+		auto mu = dict.getVal<realVector>("mu");
+
+		auto nElem = Yeff.size();
+
+		if(nElem != nu.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of Yeff("<<nElem<<") and nu("<<nu.size()<<") do not match.\n";
+			return false;
+		}
+
+		if(nElem != en.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of Yeff("<<nElem<<") and en("<<en.size()<<") do not match.\n";
+			return false;
+		}
+
+
+		if(nElem != mu.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of Yeff("<<nElem<<") and mu("<<mu.size()<<") do not match.\n";
+			return false;
+		}
+
+		
+		// check if size of vector matchs a symetric array
+		uint32 nMat;
+		if( !cGNonLinearArrayType::getN(nElem, nMat) )
+		{
+			fatalErrorInFunction<<
+			"sizes of properties do not match a symetric array with size ("<<
+			numMaterial_<<"x"<<numMaterial_<<").\n";
+			return false;
+		}
+		else if( numMaterial_ != nMat)
+		{
+			fatalErrorInFunction<<
+			"size mismatch for porperties. \n";
+			return false;
+		}
+
+		Vector<cGNonLinearProperties> prop("prop",nElem);
+		ForAll(i,Yeff)
+		{
+			prop[i] = {Yeff[i], Geff[i], en[i], mu[i]};
+		}
+
+		nonlinearProperties_.assign(prop);
+
+		auto adm = dict.getVal<word>("additionalDissipationModel");
+		if(adm == "none")
+		{
+			addDissipationModel_ = 1;
+		}
+		else if(adm == "LU")
+		{
+			addDissipationModel_ = 2;
+		}
+		else if (adm == "GB")
+		{
+			addDissipationModel_ = 3;
+		}
+		else
+		{
+			addDissipationModel_ = 1;
+		}
+
+		return true;
+
+	}
+
+	static const char* modelName()
+	{
+		if constexpr (limited)
+		{
+			return "cGNonLinearLimited";
+		}
+		else
+		{
+			return "cGNonLinearNonLimited";
+		}
+		return "";
+	}
+
+public:
+
+	TypeInfoNV(modelName());
+
+	INLINE_FUNCTION_HD
+	cGNonLinear(){}
+
+	cGNonLinear(
+		int32 nMaterial,
+		const ViewType1D<real>& rho,
+		const dictionary& dict)
+	:
+		numMaterial_(nMaterial),
+		rho_("rho",nMaterial),
+		nonlinearProperties_("cGNonLinearProperties",nMaterial)
+	{
+
+		Kokkos::deep_copy(rho_,rho);
+		if(!readNonLinearDictionary(dict))
+		{
+			fatalExit;
+		}
+	}
+	
+	INLINE_FUNCTION_HD
+	cGNonLinear(const cGNonLinear&) = default;
+
+	INLINE_FUNCTION_HD
+	cGNonLinear(cGNonLinear&&) = default;
+
+	INLINE_FUNCTION_HD
+	cGNonLinear& operator=(const cGNonLinear&) = default;
+
+	INLINE_FUNCTION_HD
+	cGNonLinear& operator=(cGNonLinear&&) = default;
+
+
+	INLINE_FUNCTION_HD
+	~cGNonLinear()=default;
+
+	INLINE_FUNCTION_HD
+	int32 numMaterial()const
+	{
+		return numMaterial_;
+	}
+
+	//// - Methods
+
+	INLINE_FUNCTION_HD
+	void contactForce
+	(
+		const real dt,
+		const uint32 i,
+		const uint32 j,
+		const uint32 propId_i,
+		const uint32 propId_j,
+		const real Ri,
+		const real Rj,
+		const real cGFi,
+		const real cGFj,
+		const real ovrlp_n,
+		const realx3& Vr,
+		const realx3& Nij,
+		contactForceStorage& history,
+		realx3& FCn,
+		realx3& FCt
+	)const
+	{
+
+		const auto prop = nonlinearProperties_(propId_i,propId_j);
+
+		const real f = 2/( 1/cGFi + 1/cGFj );
+
+		real vrn = dot(Vr, Nij);	
+		realx3 Vt = Vr - vrn*Nij;
+
+		history.overlap_t_ += Vt*dt;
+
+		real mi = 3*Pi/4*pow(Ri,static_cast<real>(3))*rho_[propId_i];
+		real mj = 3*Pi/4*pow(Rj,static_cast<real>(3))*rho_[propId_j];
+		real Reff = 1/(1/Ri + 1/Rj);
+
+		real K_hertz = 4.0/3.0*prop.Yeff_*sqrt(Reff);
+		real sqrt_meff_K_hertz = sqrt((mi*mj)/(mi+mj) * K_hertz);
+
+		real en = prop.en_;
+		if (addDissipationModel_==2)
+		{
+			en = sqrt(1+((pow(prop.en_,2)-1)*f));
+		}
+		else if (addDissipationModel_==3)
+		{
+			
+			en = exp((pow(f,static_cast<real>(1.5))*log(prop.en_)*sqrt( (1-((pow(log(prop.en_),2))/(pow(log(prop.en_),2)+pow(Pi,2))))/(1-(pow(f,3)*(pow(log(prop.en_),2))/(pow(log(prop.en_),2)+pow(Pi,2)))) ) ));
+		}
+		
+		real Kn = static_cast<real>(4.0/3.0) * prop.Yeff_ * sqrt(Reff*ovrlp_n);
+
+		real ethan_  = -2.0*log(en)*sqrt(Kn)/
+			sqrt(pow(log(en),2)+ pow(Pi,2));
+
+		FCn = ( - Kn*ovrlp_n - 
+			   sqrt_meff_K_hertz*ethan_*pow(ovrlp_n,static_cast<real>(0.25))*vrn)*Nij;
+
+		FCt = (f*f)*(- static_cast<real>(8.0) * prop.Geff_ * sqrt(Reff*ovrlp_n) ) * history.overlap_t_;
+
+		real ft = length(FCt);
+		real ft_fric = prop.mu_ * length(FCn);
+
+		// apply friction 
+		if(ft > ft_fric)
+		{
+			if( length(history.overlap_t_) >0.0)
+			{
+				if constexpr (limited)
+				{
+					real kt = static_cast<real>(8.0) * prop.Geff_ * sqrt(Reff*ovrlp_n);
+					FCt *= (ft_fric/ft);
+                	history.overlap_t_ = - FCt/(f*f*kt);
+				}
+				else
+				{
+					FCt = (FCt/ft)*ft_fric;	
+				}
+				
+			}
+			else
+			{
+				FCt = 0.0;
+			}
+		}
+
+	}
+   
+
+};
+
+} //pFlow::CFModels
+
+#endif
--- a/src/Interaction/Models/contactForce/cGRelativeLinearCF.hpp
+++ b/src/Interaction/Models/contactForce/cGRelativeLinearCF.hpp
@ -0,0 +1,326 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __cGRelativeLinearCF_hpp__
+#define __cGRelativeLinearCF_hpp__
+
+#include "types.hpp"
+#include "symArrays.hpp"
+
+
+
+namespace pFlow::cfModels
+{
+
+template<bool limited=true>
+class cGRelativeLinear
+{
+public:
+
+	struct contactForceStorage
+	{
+		realx3 overlap_t_ = 0.0;
+	};
+	
+	
+	struct linearProperties
+	{		
+		real 	kn_ 	= 1000.0;
+		real 	kt_	= 800.0;
+		real 	en_ 	= 1.0;
+		real  mu_ 	= 0.00001;
+
+		INLINE_FUNCTION_HD
+		linearProperties(){}
+
+		INLINE_FUNCTION_HD
+		linearProperties(real kn, real kt, real en, real mu  ):
+			kn_(kn), kt_(kt), en_(en), mu_(mu)
+		{}		
+
+		INLINE_FUNCTION_HD
+		linearProperties(const linearProperties&)=default;
+
+		INLINE_FUNCTION_HD
+		linearProperties& operator=(const linearProperties&)=default;
+
+		INLINE_FUNCTION_HD
+		~linearProperties() = default;
+	};
+	
+	
+
+protected:
+
+	using LinearArrayType = symArray<linearProperties>;
+	
+	int32 					numMaterial_ = 0;
+
+	ViewType1D<real>  		 rho_;
+
+	LinearArrayType  	linearProperties_;
+	
+	int32 		addDissipationModel_;	
+	
+
+	bool readLinearDictionary(const dictionary& dict)
+	{
+	
+		
+		auto kn = dict.getVal<realVector>("kn");
+		auto kt = dict.getVal<realVector>("kt");
+		auto en = dict.getVal<realVector>("en");
+		auto mu = dict.getVal<realVector>("mu");
+		
+
+		auto nElem = kn.size();
+
+
+		if(nElem != kt.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and kt("<<kt.size()<<") do not match.\n";
+			return false;
+		}
+
+		if(nElem != en.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and en("<<en.size()<<") do not match.\n";
+			return false;
+		}
+
+
+		if(nElem != mu.size())
+		{
+			fatalErrorInFunction<<
+			"sizes of kn("<<nElem<<") and mu("<<mu.size()<<") do not match.\n";
+			return false;
+		}
+
+		
+		// check if size of vector matchs a symetric array
+		uint32 nMat;
+		if( !LinearArrayType::getN(nElem, nMat) )
+		{
+			fatalErrorInFunction<<
+			"sizes of properties do not match a symetric array with size ("<<
+			numMaterial_<<"x"<<numMaterial_<<").\n";
+			return false;
+		}
+		else if( numMaterial_ != nMat)
+		{
+			fatalErrorInFunction<<
+			"size mismatch for porperties. \n"<<
+			"you supplied "<< numMaterial_<<" items in materials list and "<<
+			nMat << " for other properties.\n";
+			return false;
+		}
+
+
+		Vector<linearProperties> prop("prop", nElem);
+		ForAll(i,kn)
+		{
+			prop[i] = {kn[i], kt[i], en[i], mu[i]  };
+		}
+
+		linearProperties_.assign(prop);
+		
+
+		auto adm = dict.getVal<word>("additionalDissipationModel");
+		if(adm == "none")
+		{
+			addDissipationModel_ = 1;
+		}
+		else if(adm == "LU")
+		{
+			addDissipationModel_ = 2;
+		}
+		else if (adm == "GB")
+		{
+			addDissipationModel_ = 3;
+		}
+		else
+		{
+			addDissipationModel_ = 1;
+		}
+
+		return true;
+
+	}
+
+	static const char* modelName()
+	{
+		if constexpr (limited)
+		{
+			return "cGRelativeLinearLimited";
+		}
+		else
+		{
+			return "cGRelativeLinearNonLimited";
+		}
+		return "";
+	}
+
+public:
+
+
+	TypeInfoNV(modelName());
+
+	INLINE_FUNCTION_HD
+	cGRelativeLinear(){}
+
+	cGRelativeLinear(int32 nMaterial, const ViewType1D<real>& rho, const dictionary& dict)
+	:
+		numMaterial_(nMaterial),
+		rho_("rho",nMaterial),
+		linearProperties_("linearProperties",nMaterial)
+	{
+
+		Kokkos::deep_copy(rho_,rho);
+		if(!readLinearDictionary(dict))
+		{
+			fatalExit;
+		}
+	}
+	
+	INLINE_FUNCTION_HD
+	cGRelativeLinear(const cGRelativeLinear&) = default;
+
+	INLINE_FUNCTION_HD
+	cGRelativeLinear(cGRelativeLinear&&) = default;
+
+	INLINE_FUNCTION_HD
+	cGRelativeLinear& operator=(const cGRelativeLinear&) = default;
+
+	INLINE_FUNCTION_HD
+	cGRelativeLinear& operator=(cGRelativeLinear&&) = default;
+
+
+	INLINE_FUNCTION_HD
+	~cGRelativeLinear()=default;
+
+	INLINE_FUNCTION_HD
+	int32 numMaterial()const
+	{
+		return numMaterial_;
+	}
+
+	//// - Methods
+	INLINE_FUNCTION_HD
+	void contactForce
+	(
+		const real dt,
+		const uint32 i,
+		const uint32 j,
+		const uint32 propId_i,
+		const uint32 propId_j,
+		const real Ri,
+		const real Rj,
+		const real cGFi,
+		const real cGFj,
+		const real ovrlp_n,
+		const realx3& Vr,
+		const realx3& Nij,
+		contactForceStorage& history,
+		realx3& FCn,
+		realx3& FCt
+	)const
+	{
+		
+		auto prop = linearProperties_(propId_i,propId_j);		
+
+		real f_ = ( cGFi + cGFj )/2 ;
+
+
+		real vrn = dot(Vr, Nij);	
+		realx3 Vt = Vr - vrn*Nij;
+
+		history.overlap_t_ += Vt*dt;
+
+		real mi = 3*Pi/4*pow(Ri,3)*rho_[propId_i];
+		real mj = 3*Pi/4*pow(Rj,3)*rho_[propId_j];
+
+		real sqrt_meff = sqrt((mi*mj)/(mi+mj));
+		
+		real en = prop.en_;
+		if (addDissipationModel_==2)
+		{
+			en = sqrt(1+((pow(prop.en_,2)-1)*f_));
+		}
+		else if (addDissipationModel_==3)
+		{
+			
+			en = exp(
+				(
+					pow(f_,static_cast<real>(1.5))*
+					log(prop.en_)*
+					sqrt( 
+						(1-((pow(log(prop.en_),static_cast<real>(2.0))
+						)/
+						(
+							pow(log(prop.en_),static_cast<real>(2.0))+
+							pow(Pi,static_cast<real>(2.0)))))/
+							(1-(pow(f_,3)*(pow(log(prop.en_),2))/
+							(pow(log(prop.en_),static_cast<real>(2.0))+
+							pow(Pi,static_cast<real>(2.0))))) ) ));
+		}
+
+		real ethan_  = -2.0*log(en)*sqrt(prop.kn_)/
+			sqrt(pow(log(en),2)+ pow(Pi,2));
+		
+
+		FCn = ( -f_*prop.kn_ * ovrlp_n - sqrt_meff * pow(f_,half) * ethan_ * vrn)*Nij;
+		FCt = ( -f_*prop.kt_ * history.overlap_t_);
+		
+
+		
+		real ft = length(FCt);
+		real ft_fric = prop.mu_ * length(FCn);
+		
+		if(ft > ft_fric)
+		{
+			if( length(history.overlap_t_) >static_cast<real>(0.0))
+			{
+				if constexpr (limited)
+				{
+					FCt *= (ft_fric/ft);
+                	history.overlap_t_ = - (FCt/prop.kt_);
+				}
+				else
+				{
+					FCt = (FCt/ft)*ft_fric;	
+				}
+				//cout<<"friction is applied here \n";
+				
+			}
+			else
+			{
+				FCt = 0.0;
+			}
+		}
+
+	}
+	
+};
+
+} //pFlow::cfModels
+
+#endif
--- a/src/Interaction/Models/contactForce/linearCF.hpp
+++ b/src/Interaction/Models/contactForce/linearCF.hpp
@ -139,10 +139,10 @@ protected:
 		ForAll(i , kn)
 		{
 			etha_n[i] = -2.0*log(en[i])*sqrt(kn[i])/
-					sqrt(pow(log(en[i]),2.0)+ pow(Pi,2.0));
+					sqrt(pow(log(en[i]),static_cast<real>(2.0))+ pow(Pi,static_cast<real>(2.0)));

 			etha_t[i] = -2.0*log( et[i]*sqrt(kt[i]) )/
-					sqrt(pow(log(et[i]),2.0)+ pow(Pi,2.0));
+					sqrt(pow(log(et[i]),static_cast<real>(2.0))+ pow(Pi,static_cast<real>(2.0)));
 		}

 		Vector<linearProperties> prop("prop", nElem);
@ -243,8 +243,8 @@ public:

 		history.overlap_t_ += Vt*dt;

-		real mi = 3*Pi/4*pow(Ri,3.0)*rho_[propId_i];
-		real mj = 3*Pi/4*pow(Rj,3.0)*rho_[propId_j];
+		real mi = 3*Pi/4*pow(Ri,static_cast<real>(3.0))*rho_[propId_i];
+		real mj = 3*Pi/4*pow(Rj,static_cast<real>(3.0))*rho_[propId_j];

 		real sqrt_meff = sqrt((mi*mj)/(mi+mj));

--- a/src/Interaction/Models/contactForce/nonLinearCF.hpp
+++ b/src/Interaction/Models/contactForce/nonLinearCF.hpp
@ -131,7 +131,7 @@ protected:
 			// we take out sqrt(meff*K_hertz) here and then consider this term 
 			// when calculating damping part. 
 			etha_n[i] = -2.2664*log(en[i])/
-					sqrt(pow(log(en[i]),2.0)+ pow(Pi,2.0));
+					sqrt(pow(log(en[i]),static_cast<real>(2.0))+ pow(Pi,static_cast<real>(2.0)));

 			// no damping for tangential part 

@ -255,7 +255,7 @@ public:
 		// apply friction 
 		if(ft > ft_fric)
 		{
-			if( length(history.overlap_t_) >0.0)
+			if( length(history.overlap_t_) >zero)
 			{
 				if constexpr (limited)
 				{
--- a/src/Interaction/Models/grainContactForceModels.hpp
+++ b/src/Interaction/Models/grainContactForceModels.hpp
@ -0,0 +1,50 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __grainContactForceModels_hpp__
+#define __grainContactForceModels_hpp__
+
+#include "cGAbsoluteLinearCF.hpp"
+#include "cGRelativeLinearCF.hpp"
+#include "cGNonLinearCF.hpp"
+
+#include "grainRolling.hpp"
+
+
+
+namespace pFlow::cfModels 
+{
+
+
+using limitedCGAbsoluteLinearGrainRolling 	= grainRolling<cGAbsoluteLinear<true>>;
+using nonLimitedCGAbsoluteLinearGrainRolling = grainRolling<cGAbsoluteLinear<false>>;
+
+using limitedCGRelativeLinearGrainRolling   = grainRolling<cGRelativeLinear<true>>;
+using nonLimitedCGRelativeLinearGrainRolling = grainRolling<cGRelativeLinear<false>>;
+
+using limitedCGNonLinearGrainRolling   = grainRolling<cGNonLinear<true>>;
+using nonLimitedCGNonLinearGrainRolling = grainRolling<cGNonLinear<false>>;
+
+
+}
+
+
+
+#endif //__grainContactForceModels_hpp__
--- a/src/Interaction/Models/rolling/grainRolling.hpp
+++ b/src/Interaction/Models/rolling/grainRolling.hpp
@ -0,0 +1,119 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __grainRolling_hpp__
+#define __grainRolling_hpp__
+
+
+namespace pFlow::cfModels
+{
+
+template<typename contactForceModel>
+class grainRolling
+:
+	public contactForceModel
+{
+public:
+	
+	using contactForceStorage = 
+		typename contactForceModel::contactForceStorage;
+
+
+	realSymArray_D  	mur_;
+
+	bool readGrainDict(const dictionary& dict)
+	{
+		auto mur = dict.getVal<realVector>("mur");
+
+		uint32 nMat;
+
+		if(!realSymArray_D::getN(mur.size(),nMat) || nMat != this->numMaterial())
+		{
+			fatalErrorInFunction<<
+			"wrong number of values supplied in mur. \n";
+			return false;
+		}
+
+		mur_.assign(mur);
+
+		return true; 
+	}
+
+public:
+
+	TypeInfoNV(word("normal<"+contactForceModel::TYPENAME()+">"));
+	
+
+	grainRolling(int32 nMaterial, const ViewType1D<real>& rho, const dictionary& dict)
+	:
+		contactForceModel(nMaterial, rho, dict),
+		mur_("mur", nMaterial)
+	{
+		if(!readGrainDict(dict))
+		{
+			fatalExit;
+		}
+	}
+
+	INLINE_FUNCTION_HD
+	void rollingFriction
+	(
+		const real dt,
+		const uint32 i,
+		const uint32 j,
+		const uint32 propId_i,
+		const uint32 propId_j,
+		const real Ri,
+		const real Rj,
+		const real cGFi,
+		const real cGFj,
+		const realx3& wi,
+		const realx3& wj,
+		const realx3& Nij,
+		const realx3& FCn,
+		realx3& Mri,
+		realx3& Mrj
+	)const
+	{
+
+		realx3 w_hat = wi-wj;
+		real w_hat_mag = length(w_hat);
+
+		if( !equal(w_hat_mag,static_cast<real>(0.0)) )
+			w_hat /= w_hat_mag;
+		else
+			w_hat = static_cast<real>(0.0);
+
+		auto Reff = (Ri*Rj)/(Ri+Rj);
+
+		Mri = ( -mur_(propId_i,propId_j) *length(FCn) * Reff ) * w_hat ;
+       
+       	//removing the normal part 
+       	// Mri = Mri - ( (Mri .dot. nij)*nij )
+
+       	Mrj = -Mri;
+	}
+
+
+};
+
+}
+ 
+#endif 
--- a/src/Interaction/Models/rolling/normalRolling.hpp
+++ b/src/Interaction/Models/rolling/normalRolling.hpp
@ -94,10 +94,10 @@ public:
 		realx3 w_hat = wi-wj;
 		real w_hat_mag = length(w_hat);

-		if( !equal(w_hat_mag,0.0) )
+		if( !equal(w_hat_mag,static_cast<real>(0.0)) )
 			w_hat /= w_hat_mag;
 		else
-			w_hat = 0.0;
+			w_hat = static_cast<real>(0.0);

 		auto Reff = (Ri*Rj)/(Ri+Rj);

--- a/src/Interaction/contactLists/sortedContactList.hpp
+++ b/src/Interaction/contactLists/sortedContactList.hpp
@ -80,13 +80,17 @@ public:

 	TypeInfoNV("sortedContactList");

-
-	explicit sortedContactList(uint32 initialSize =1)
+	sortedContactList(uint32 initialSize =1)
 	:
-		SortedPairs(initialSize),
-		values_("values", SortedPairs::capacity()),
-		sortedPairs0_("sortedPairs0", SortedPairs::capacity()),
-		values0_("values0", SortedPairs::capacity())
+		sortedContactList("sortedContactList", initialSize)
+	{}
+	
+	sortedContactList(const word& name, uint32 initialSize =1)
+	:
+		SortedPairs(name, initialSize),
+		values_(groupNames(name, "values"), SortedPairs::capacity()),
+		sortedPairs0_(groupNames(name, "sortedPairs0"), SortedPairs::capacity()),
+		values0_(groupNames(name, "values0"), SortedPairs::capacity())
 	{}

 	bool beforeBroadSearch()
--- a/src/Interaction/contactLists/sortedPairs.hpp
+++ b/src/Interaction/contactLists/sortedPairs.hpp
@ -110,11 +110,11 @@ public:


 	// constructors
-	explicit sortedPairs(uint32 initialSize =1)
+	explicit sortedPairs(const word& name, uint32 initialSize =1)
 	:
 		UnsortedPairs(initialSize),
-		flags_("flags_",UnsortedPairs::capacity()+1),
-		sortedPairs_("sortedPairs_",UnsortedPairs::capacity())
+		flags_( groupNames(name, "flags_"), UnsortedPairs::capacity()+1),
+		sortedPairs_(groupNames(name, "sortedPairs_"), UnsortedPairs::capacity())
 	{}

 	
@ -193,7 +193,7 @@ public:

 		if( capacity+1 > flags_.size() )
 		{
-			reallocNoInit(flags_, capacity+1);
+			reallocInit(flags_, capacity+1);
 		}

 		// fill the flags
@ -219,7 +219,7 @@ public:
 		{
 			// get more space to prevent reallocations in next iterations
 			uint32 len = size_*1.1+1; 
-			reallocNoInit(sortedPairs_, len);
+			reallocInit(sortedPairs_, len);
 		}
 		
 		Kokkos::parallel_for(
@ -231,6 +231,7 @@ public:
 		// - sort paris based on the first and second
 		sort(sortedPairs_, 0, size_ );
 		
+		

 	}

--- a/src/Interaction/contactLists/unsortedContactList.hpp
+++ b/src/Interaction/contactLists/unsortedContactList.hpp
@ -82,11 +82,16 @@ public:
 	TypeInfoNV("unsortedContactList");

 	explicit unsortedContactList(uint32 capacity=1)
+	:
+	unsortedContactList("unsortedContactList", capacity)
+	{}
+	
+	unsortedContactList(const word& name, uint32 capacity=1)
 	:
 		UnsortedPairs(capacity),
-		values_("values", UnsortedPairs::capacity()),
+		values_(groupNames(name, "values"), UnsortedPairs::capacity()),
 		container0_(capacity),
-		values0_("values0",container0_.capacity())
+		values0_(groupNames(name, "values0"),container0_.capacity())
 	{}


--- a/src/Interaction/contactLists/unsortedPairs.hpp
+++ b/src/Interaction/contactLists/unsortedPairs.hpp
@ -194,7 +194,9 @@ public:
 	{
 		uint newCap = container_.capacity()+len;
 		this->clear();
+		//output<<"----------------before "<<capacity()<< " " << size()<<endl;
 		container_.rehash(newCap);
+		//output<<"----------------after "<<capacity()<< " " << size()<<endl;
 	}

 	INLINE_FUNCTION_H
--- a/src/Interaction/contactSearch/ContactSearch/ContactSearch.hpp
+++ b/src/Interaction/contactSearch/ContactSearch/ContactSearch.hpp
@ -53,6 +53,47 @@ private:

 	boundaryContactSearchList 		csBoundaries_;

+	bool BroadSearch(
+		const timeInfo& ti,
+		csPairContainerType& ppPairs,
+		csPairContainerType& pwPairs,
+		bool force = false) override
+	{
+		
+		auto position = Particles().pointPosition().deviceViewAll();
+		auto flags = Particles().dynPointStruct().activePointsMaskDevice();
+		auto diam = Particles().boundingSphere().deviceViewAll();
+
+		return ppwContactSearch_().broadSearch(
+			ti.iter(),
+			ti.t(),
+			ti.dt(),
+			ppPairs, 
+			pwPairs,
+			position, 
+			flags, 
+			diam,
+			force
+		);
+	}
+
+	bool BoundaryBroadSearch(
+		uint32 bndryIndex,
+		const timeInfo& ti,
+		csPairContainerType& ppPairs,
+		csPairContainerType& pwPairs,
+		bool force = false)override
+	{		
+		return csBoundaries_[bndryIndex].broadSearch(
+			ti.iter(), 
+			ti.t(), 
+			ti.dt(), 
+			ppPairs, 
+			pwPairs, 
+			force
+		);
+	}
+
 public:

 	TypeInfoTemplate11("ContactSearch", SearchMethodType);
@ -93,7 +134,7 @@ public:
 		ppwContactSearch_ = 
 			makeUnique<SearchMethodType>
 			(
-				dict(),
+				csDict,
 				this->extendedDomainBox(),
 				minD,
 				maxD,
@ -108,95 +149,19 @@ public:
 			);
 	}

-
 	add_vCtor(
 		contactSearch,
 		ContactSearch,
 		dictionary);

+	bool enterBroadSearchBoundary(const timeInfo& ti, bool force=false)const override;
 	
-	bool broadSearch(
-		uint32 iter,
-		real t,
-		real dt,
-		csPairContainerType& ppPairs,
-		csPairContainerType& pwPairs,
-		bool force = false) override
-	{
-		
-
-		ppTimer().start();
-	
-		const auto& position = Particles().pointPosition().deviceViewAll();
-		const auto& flags = Particles().dynPointStruct().activePointsMaskDevice();
-		const auto& diam = Particles().boundingSphere().deviceViewAll();
-		
-		
-		if( !ppwContactSearch_().broadSearch(
-			iter,
-			t,
-			dt,
-			ppPairs, 
-			pwPairs,
-			position, 
-			flags, 
-			diam,
-			force) )
-		{
-			fatalErrorInFunction;
-			return false;
-		}
-		ppTimer().end();
-
-		return true;
-	}
-
-	bool boundaryBroadSearch(
-		uint32 i,
-		uint32 iter,
-		real t,
-		real dt,
-		csPairContainerType& ppPairs,
-		csPairContainerType& pwPairs,
-		bool force = false)override
-	{
-		if(i==0u)
-			Particles().boundingSphere().updateBoundaries(DataDirection::SlaveToMaster);
-		return csBoundaries_[i].broadSearch(
-			iter, 
-			t, 
-			dt, 
-			ppPairs, 
-			pwPairs, 
-			force);
-	}
-
-	bool enterBroadSearch(uint32 iter, real t, real dt)const override
-	{
-		if(ppwContactSearch_)
-		{
-			return ppwContactSearch_().performSearch(iter); 
-		}
-		return false;
-	}
-
-	bool performedBroadSearch()const override
-	{
-		return ppwContactSearch_().performedSearch();
-	}
-
-	
-	uint32 updateInterval()const override
-	{
-		return ppwContactSearch_().updateInterval();
-	}

 	real sizeRatio()const override
 	{
 		return ppwContactSearch_().sizeRatio();
 	}

-	 
 	real cellExtent()const override
 	{
 		return ppwContactSearch_().cellExtent();
@ -204,7 +169,12 @@ public:
 	
 };

+template <class searchMethod>
+inline bool ContactSearch<searchMethod>::enterBroadSearchBoundary(const timeInfo &ti, bool force) const
+{
+	return performSearch(ti.iter(),force) || csBoundaries_.boundariesUpdated();
 }

+}

 #endif //__ContactSearch_hpp__
--- a/src/Interaction/contactSearch/boundaries/boundaryContactSearch/boundaryContactSearch.hpp
+++ b/src/Interaction/contactSearch/boundaries/boundaryContactSearch/boundaryContactSearch.hpp
@ -73,9 +73,7 @@ public:
    }

    bool hearChanges(
-        real t,
-        real dt,
-        uint32 iter,
+        const timeInfo& ti,
        const message &msg,
        const anyList &varList) override
    {
@ -83,8 +81,10 @@ public:
        if (msg.equivalentTo(message::BNDR_RESET))
        {
            // do nothing
+            return true;
        }
-        return true;
+        fatalErrorInFunction;
+        return false;
    }

    virtual bool broadSearch(
@ -98,6 +98,11 @@ public:
        return true;
    }

+    bool isActive()const override
+    {
+        return false;
+    }
+
    static uniquePtr<boundaryContactSearch> create(
        const dictionary &dict,
        const boundaryBase &boundary,
--- a/src/Interaction/contactSearch/boundaries/boundaryContactSearchList.cpp
+++ b/src/Interaction/contactSearch/boundaries/boundaryContactSearchList.cpp
@ -1,3 +1,23 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions.
+
+  phasicFlow is distributed to help others in their research in the field of
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
 #include "boundaryContactSearchList.hpp"
 #include "boundaryList.hpp"

@ -5,7 +25,7 @@ void pFlow::boundaryContactSearchList::setList(
    const dictionary &dict, 
    const contactSearch &cSearch)
 {
-    for(auto i=0; i<boundaries_.size(); i++)
+    ForAllBoundariesPtr(i, this)
    {
        this->set
        (
@ -20,10 +40,13 @@ pFlow::boundaryContactSearchList::boundaryContactSearchList(
    const boundaryList& bndrs,
    const contactSearch &cSearch)
    :
-    ListPtr(bndrs.size()), 
+    boundaryListPtr(), 
    boundaries_(bndrs)
 {
    setList(dict, cSearch);
 }

-
+bool pFlow::boundaryContactSearchList::boundariesUpdated() const
+{
+    return boundaries_.boundariesUpdated();
+}
--- a/src/Interaction/contactSearch/boundaries/boundaryContactSearchList.hpp
+++ b/src/Interaction/contactSearch/boundaries/boundaryContactSearchList.hpp
@ -1,4 +1,24 @@
-#include "ListPtr.hpp"
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions.
+
+  phasicFlow is distributed to help others in their research in the field of
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#include "boundaryListPtr.hpp"
 #include "boundaryContactSearch.hpp"

 namespace pFlow
@ -9,7 +29,7 @@ class contactSearch;

 class boundaryContactSearchList
 :
-    public ListPtr<boundaryContactSearch>
+    public boundaryListPtr<boundaryContactSearch>
 {
 private:

@ -28,6 +48,14 @@ public:
        const contactSearch& cSearch);
    
    ~boundaryContactSearchList()=default;
+
+    inline
+    const boundaryList& boundaries()const
+    {
+        return boundaries_;
+    } 
+
+    bool boundariesUpdated()const;
    
 };

--- a/src/Interaction/contactSearch/boundaries/periodicBoundaryContactSearch/periodicBoundaryContactSearch.hpp
+++ b/src/Interaction/contactSearch/boundaries/periodicBoundaryContactSearch/periodicBoundaryContactSearch.hpp
@ -74,6 +74,11 @@ public:
 		csPairContainerType &ppPairs,
 		csPairContainerType &pwPairs,
 		bool force = false) override;
+	
+	bool isActive()const override
+	{
+		return true;
+	}
 };

 }
--- a/src/Interaction/contactSearch/boundaries/periodicBoundaryContactSearch/wallBoundaryContactSearch.cpp
+++ b/src/Interaction/contactSearch/boundaries/periodicBoundaryContactSearch/wallBoundaryContactSearch.cpp
@ -11,7 +11,7 @@ pFlow::wallBoundaryContactSearch::wallBoundaryContactSearch
    const ViewType1D<realx3, memory_space> &normals
 )
 :
-    cellExtent_( max(cellExtent, 0.5 ) ),
+    cellExtent_( max(cellExtent, half ) ),
    numElements_(numElements),
    numPoints_(numPoints),
    vertices_(vertices),
--- a/src/Interaction/contactSearch/contactSearch/contactSearch.cpp
+++ b/src/Interaction/contactSearch/contactSearch/contactSearch.cpp
@ -31,11 +31,11 @@ pFlow::contactSearch::contactSearch(
 	Timers& timers)
 :
 	extendedDomainBox_(extDomain),
+	updateInterval_(dict.getValMax<uint32>("updateInterval", 1u)),
 	particles_(prtcl),
 	geometry_(geom),
-	ppTimer_("particle-particle contact search", &timers),
-	pwTimer_("particle-wall contact search", &timers),
-	dict_(dict)
+	bTimer_("Boundary particles contact search", &timers),
+	ppTimer_("Internal particles contact search", &timers)
 {

 }
@ -45,6 +45,78 @@ const pFlow::pointStructure &pFlow::contactSearch::pStruct() const
   return particles_.pStruct();
 }

+bool pFlow::contactSearch::broadSearch
+(
+	const timeInfo &ti, 
+	csPairContainerType &ppPairs, 
+	csPairContainerType &pwPairs, 
+	bool force
+)
+{
+
+	if(enterBroadSearch(ti, force))
+	{
+		ppTimer_.start();
+		if( !BroadSearch(
+			ti,
+			ppPairs,
+			pwPairs,
+			force ) )
+		{
+			fatalErrorInFunction;
+			performedSearch_ = false;
+			return false;
+		}
+		ppTimer_.end();
+		performedSearch_ = true;
+		lastUpdated_ = ti.currentIter();
+	}
+	else
+	{
+		performedSearch_ = false;
+	}
+
+	return true;
+}
+
+bool pFlow::contactSearch::boundaryBroadSearch
+(
+	uint32 bndryIndex, 
+	const timeInfo &ti, 
+	csPairContainerType &ppPairs, 
+	csPairContainerType &pwPairs, 
+	bool force
+)
+{
+	if(enterBroadSearchBoundary(ti, force))
+	{
+		bTimer_.start();
+		for(uint32 i=0u; i<6u; i++)
+		{
+			//output<<" boundarySearch "<< i <<" for iter "<< ti.iter()<<endl;
+			if(!BoundaryBroadSearch(
+				i,
+				ti,
+				ppPairs,
+				pwPairs,
+				force))
+			{
+				performedSearchBoundary_ = false;
+				return false;
+			}
+		}
+		bTimer_.end();
+		performedSearchBoundary_ = true;
+	}
+	else
+	{
+
+		performedSearchBoundary_ = false;
+	}
+
+    return true;
+}
+
 pFlow::uniquePtr<pFlow::contactSearch> pFlow::contactSearch::create(
    const dictionary &dict,
    const box &extDomain,
--- a/src/Interaction/contactSearch/contactSearch/contactSearch.hpp
+++ b/src/Interaction/contactSearch/contactSearch/contactSearch.hpp
@ -26,6 +26,7 @@ Licence:
 #include "contactSearchGlobals.hpp"
 #include "dictionary.hpp"
 #include "virtualConstructor.hpp"
+#include "timeInfo.hpp"
 #include "Timer.hpp"

 namespace pFlow
@ -44,15 +45,44 @@ private:

 	const box& 	extendedDomainBox_;

+	/// @brief update interval in terms of iteration numebr 
+	uint32 		updateInterval_= 1;
+
+	/// @brief  last iteration number which contact search has been performed
+	uint32 		lastUpdated_ 	= 0;
+
+	/// @brief performed search? 
+	bool 		performedSearch_ = false;
+
+	/// @brief performed search in boundaries
+	bool 		performedSearchBoundary_ = false;
+
+	/// const ref to particles
 	const particles& 		particles_;

+	/// const ref to geometry 
 	const geometry&			geometry_;

+	Timer 		bTimer_;
+
 	Timer 		ppTimer_;

-	Timer 		pwTimer_;
+	virtual
+	bool BroadSearch(
+		const timeInfo& ti,
+		csPairContainerType& ppPairs,
+		csPairContainerType& pwPairs,
+		bool force
+	)=0;

-	dictionary 	dict_;
+	virtual
+	bool  BoundaryBroadSearch(
+		uint32 bndryIndex,
+		const timeInfo& ti,
+		csPairContainerType& ppPairs,
+		csPairContainerType& pwPairs,
+		bool force = false
+	)=0;

 public:

@ -82,66 +112,86 @@ public:
 	 	(dict, domain, prtcl, geom, timers)
 	);

-	
-	const auto& dict()const
+	inline
+	bool performedSearch()const
 	{
-		return dict_;
+		return performedSearch_;
 	}

-	const auto& extendedDomainBox()const
+	inline 
+	bool performedSearchBoundary()const 
+	{
+		return performedSearchBoundary_;
+	}
+
+	inline
+	bool performSearch(uint32 iter, bool force = false)const
+	{
+		if((iter-lastUpdated_) % updateInterval_ == 0 || iter == 0 || force )
+		{
+			return true;
+		}
+		return false;		
+	}
+
+	bool enterBroadSearch(const timeInfo& ti, bool force = false)const
+	{
+		return performSearch(ti.iter(), force);
+	}
+
+	virtual 
+	bool enterBroadSearchBoundary(const timeInfo& ti, bool force=false)const = 0;
+
+	inline
+	uint32 updateInterval()const
+	{
+		return updateInterval_;
+	}
+
+	inline
+	const box& extendedDomainBox()const
 	{
 		return extendedDomainBox_;
 	}

-	const auto& Particles()const
+	inline
+	const particles& Particles()const
 	{
 		return particles_;
 	}

 	const pointStructure& pStruct()const;

-	const auto& Geometry()const
+	inline
+	const geometry& Geometry()const
 	{
 		return geometry_;
 	}

-	auto& ppTimer()
+	inline
+	Timer& ppTimer()
 	{
 		return ppTimer_;
 	}

-	auto& pwTimer()
+	inline
+	Timer& bTimer()
 	{
-		return pwTimer_;
+		return bTimer_;
 	}
-
-	virtual 
+ 
 	bool broadSearch(
-		uint32 iter,
-		real t,
-		real dt,
+		const timeInfo& ti,
 		csPairContainerType& ppPairs,
 		csPairContainerType& pwPairs,
-		bool force = false) = 0;
+		bool force = false);
 	
-	virtual 
 	bool boundaryBroadSearch(
-		uint32 i,
-		uint32 iter,
-		real t,
-		real dt,
+		uint32 bndryIndex,
+		const timeInfo& ti,
 		csPairContainerType& ppPairs,
 		csPairContainerType& pwPairs,
-		bool force = false)=0;
-
-	virtual 
-	bool enterBroadSearch(uint32 iter, real t, real dt)const = 0;
-
-	virtual 
-	bool performedBroadSearch()const = 0;
-
-	virtual
-	uint32 updateInterval()const = 0;
+		bool force = false);

 	virtual 
 	real sizeRatio()const = 0;
--- a/src/Interaction/contactSearch/methods/cellBased/NBS/NBS.cpp
+++ b/src/Interaction/contactSearch/methods/cellBased/NBS/NBS.cpp
@ -44,9 +44,9 @@ pFlow::NBS::NBS
        position,
        flags,
        diam),
-    sizeRatio_(max(dict.getVal<real>("sizeRatio"), 1.0)),
-    cellExtent_(max(dict.getVal<real>("cellExtent"), 0.5)),
-    adjustableBox_(dict.getVal<Logical>("adjustableBox")),
+    sizeRatio_(max(dict.getVal<real>("sizeRatio"), one)),
+    cellExtent_(max(dict.getVal<real>("cellExtent"), half)),
+    adjustableBox_(false),//adjustableBox_(dict.getVal<Logical>("adjustableBox")),
    NBSLevel0_
 	(
        this->domainBox_,
--- a/src/Interaction/contactSearch/methods/cellBased/NBS/cellsWallLevel0.cpp
+++ b/src/Interaction/contactSearch/methods/cellBased/NBS/cellsWallLevel0.cpp
@ -31,7 +31,7 @@ pFlow::cellsWallLevel0::cellsWallLevel0
 	const ViewType1D<realx3, memory_space>& normals
 )
 :
-    cellExtent_( max(cellExtent, 0.5 ) ),
+    cellExtent_( max(cellExtent, half ) ),
    numElements_(numElements),
    numPoints_(numPoints),
    vertices_(vertices),
--- a/src/Interaction/contactSearch/methods/cellBased/NBS/mapperNBS.cpp
+++ b/src/Interaction/contactSearch/methods/cellBased/NBS/mapperNBS.cpp
@ -23,7 +23,7 @@ Licence:
 #include "streams.hpp"

 pFlow::uint32 pFlow::mapperNBS::checkInterval_ = 1000;
-pFlow::real pFlow::mapperNBS::enlargementFactor_ = 1.1;
+pFlow::real pFlow::mapperNBS::enlargementFactor_ = 1.5;

 bool pFlow::mapperNBS::setSearchBox
 (
--- a/src/Interaction/contactSearch/methods/cellBased/NBS/mapperNBSKernels.cpp
+++ b/src/Interaction/contactSearch/methods/cellBased/NBS/mapperNBSKernels.cpp
@ -21,7 +21,7 @@ Licence:
 -----------------------------------------------------------------------------*/

 #include "mapperNBSKernels.hpp"
-
+#include "streams.hpp"

 void pFlow::mapperNBSKernels::findPointExtends
 (
@ -153,16 +153,19 @@ bool pFlow::mapperNBSKernels::buildLists
    const pFlagTypeDevice &flags
 )
 {
+    
    auto aRange = flags.activeRange();
+    
+    auto pp = points;
    if(flags.isAllActive() )
-    {
+    { 
        Kokkos::parallel_for
        (
            "pFlow::mapperNBSKernels::buildLists",
            deviceRPolicyStatic(aRange.start(), aRange.end()),
            LAMBDA_HD(uint32 i)
-            {
-                auto ind = searchCell.pointIndex(points[i]);	
+            {               
+                auto ind = searchCell.pointIndex(pp[i]);
                uint32 old = Kokkos::atomic_exchange(&head(ind.x(), ind.y(), ind.z()), i);
                next[i] = old;
            }
--- a/src/Interaction/contactSearch/methods/particleWallContactSearchs.cpp
+++ b/src/Interaction/contactSearch/methods/particleWallContactSearchs.cpp
@ -31,48 +31,36 @@ pFlow::particleWallContactSearchs<method>::particleWallContactSearchs
    const ViewType1D<real, memory_space> &diam
 )
 :
-    domainBox_(domain),
-    updateInterval_
-    (
-        max(dict.getValOrSet<uint32>("updateInterval", 1),1u)
-    )
-{
-    
-}
+    domainBox_(domain)
+{}

 template <typename method>
 bool pFlow::particleWallContactSearchs<method>::broadSearch
-	(
-		uint32 iter,
-		real t,
-		real dt,
-		csPairContainerType& ppPairs,
-		csPairContainerType& pwPairs,
-		const deviceViewType1D<realx3>& pointPos,
-		const pFlagTypeDevice& flags,
-		const deviceViewType1D<real>& diameter,
-		bool  force
-	)
+(
+	uint32 iter,
+	real t,
+	real dt,
+	csPairContainerType& ppPairs,
+	csPairContainerType& pwPairs,
+	const deviceViewType1D<realx3>& pointPos,
+	const pFlagTypeDevice& flags,
+	const deviceViewType1D<real>& diameter,
+	bool  force
+)
+{
+	
+	if(!getMethod().impl_broadSearch(
+		ppPairs,
+		pwPairs,
+		pointPos,
+		flags,
+		diameter))
 	{
-		
-		performedSearch_ = false;
-		if( !performSearch(iter, force) ) return true;
-
-		if(!getMethod().impl_broadSearch(
-			ppPairs,
-			pwPairs,
-			pointPos,
-			flags,
-			diameter))
-		{
-			fatalErrorInFunction<<
-			"Error in performing particle-particle broadSearch in method"<<
-			getMethod().typeName()<<endl;
-			return false;
-		}
-
-		lastUpdated_ = iter;
-		
-		performedSearch_ = true;		
-		return true;
-	}
+		fatalErrorInFunction<<
+		"Error in performing particle-particle broadSearch in method"<<
+		getMethod().typeName()<<endl;
+		return false;
+	}
+	
+	return true;
+}
--- a/src/Interaction/contactSearch/methods/particleWallContactSearchs.hpp
+++ b/src/Interaction/contactSearch/methods/particleWallContactSearchs.hpp
@ -48,18 +48,6 @@ private:
 	/// @brief  box enclosing the simulation domain (local to processor)
 	box 		domainBox_;

-	/*/// @brief box enclosing the area for contact search (region with points)
-	box 		searchBox_;*/
-
-	/// @brief update interval in terms of iteration numebr 
-	uint32 		updateInterval_= 1;
-
-	/// @brief  last iteration number which contact search has been performed
-	uint32 		lastUpdated_ 	= 0;
-
-	/// @brief performed search? 
-	bool 		performedSearch_ = false;
-
 protected:

 	inline
@ -98,25 +86,6 @@ public:
    	const deviceViewType1D<real>& diameter,
 		bool  force = false
 	);
-		
-	bool performedSearch()const
-	{
-		return performedSearch_;
-	}
-
-	bool performSearch(uint32 iter, bool force = false)const
-	{
-		if((iter-lastUpdated_) % updateInterval_ == 0 || iter == 0 || force )
-		{
-			return true;
-		}
-		return false;		
-	}
-
-	uint32 updateInterval()const
-	{
-		return updateInterval_;
-	}

 	real sizeRatio()const
 	{
--- a/src/Interaction/grainInteraction/boundaries/boundaryGrainInteraction/boundaryGrainInteraction.cpp
+++ b/src/Interaction/grainInteraction/boundaries/boundaryGrainInteraction/boundaryGrainInteraction.cpp
@ -0,0 +1,104 @@
+#include "boundarySphereInteraction.hpp"
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+template <typename cFM, typename gMM>
+void pFlow::boundaryGrainInteraction<cFM, gMM>::allocatePPPairs()
+{
+	ppPairs_.reset(nullptr);
+	ppPairs_ = makeUnique<ContactListType>(1);
+}
+
+template <typename cFM, typename gMM>
+void pFlow::boundaryGrainInteraction<cFM, gMM>::allocatePWPairs()
+{
+	pwPairs_.reset(nullptr);
+	pwPairs_ = makeUnique<ContactListType>(1);
+}
+
+
+template <typename cFM, typename gMM>
+pFlow::boundaryGrainInteraction<cFM, gMM>::boundaryGrainInteraction(
+	const boundaryBase &boundary,
+	const grainParticles &grnPrtcls,
+	const GeometryMotionModel &geomMotion)
+	: generalBoundary(boundary, grnPrtcls.pStruct(), "", ""),
+	  geometryMotion_(geomMotion),
+	  grnParticles_(grnPrtcls)
+{
+}
+
+template <typename cFM, typename gMM>
+pFlow::uniquePtr<pFlow::boundaryGrainInteraction<cFM, gMM>>
+pFlow::boundaryGrainInteraction<cFM, gMM>::create(
+	const boundaryBase &boundary,
+	const grainParticles &grnPrtcls,
+	const GeometryMotionModel &geomMotion)
+{
+	word cfTypeName = ContactForceModel::TYPENAME();
+	word gmTypeName = MotionModel::TYPENAME();
+	word bType = boundary.type();
+
+	word boundaryTypeName = angleBracketsNames3(
+		"boundaryGrainInteraction",
+		bType,
+		cfTypeName,
+		gmTypeName);
+
+	word altBTypeName = angleBracketsNames2(
+		"boundaryGrainInteraction",
+		cfTypeName,
+		gmTypeName);
+
+	if (boundaryBasevCtorSelector_.search(boundaryTypeName))
+	{
+		pOutput.space(4) << "Creating boundry type " << Green_Text(boundaryTypeName) << 
+		" for boundary " << boundary.name() << " . . ." << END_REPORT;
+		return boundaryBasevCtorSelector_[boundaryTypeName](
+			boundary,
+			grnPrtcls,
+			geomMotion);
+	}
+	else if(boundaryBasevCtorSelector_[altBTypeName])
+	{
+		// if boundary condition is not implemented, the default is used
+		
+		pOutput.space(4) << "Creating boundry type " << Green_Text(altBTypeName) << 
+		" for boundary " << boundary.name() << " . . ." << END_REPORT;
+		return boundaryBasevCtorSelector_[altBTypeName](
+			boundary,
+			grnPrtcls,
+			geomMotion);
+	}
+	else
+	{
+		printKeys
+		( 
+			fatalError << "Ctor Selector "<< boundaryTypeName<<
+			" and "<< altBTypeName << " do not exist. \n"
+			<<"Avaiable ones are: \n\n"
+			,
+			boundaryBasevCtorSelector_
+		);
+		fatalExit;
+	}
+
+	return nullptr;
+}
--- a/src/Interaction/grainInteraction/boundaries/boundaryGrainInteraction/boundaryGrainInteraction.hpp
+++ b/src/Interaction/grainInteraction/boundaries/boundaryGrainInteraction/boundaryGrainInteraction.hpp
@ -0,0 +1,188 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+#ifndef __boundaryGrainInteraction_hpp__
+#define __boundaryGrainInteraction_hpp__
+
+#include "virtualConstructor.hpp"
+#include "generalBoundary.hpp"
+#include "sortedContactList.hpp"
+#include "grainParticles.hpp"
+
+namespace pFlow
+{
+
+template<typename contactForceModel,typename geometryMotionModel>
+class boundaryGrainInteraction
+:
+    public generalBoundary
+{
+public:
+	
+	using BoundaryGrainInteractionType
+			= boundaryGrainInteraction<contactForceModel, geometryMotionModel>;
+
+    using GeometryMotionModel 	= geometryMotionModel;
+	
+	using ContactForceModel 	= contactForceModel;
+
+	using MotionModel 			= typename geometryMotionModel::MotionModel;
+
+	using ModelStorage 			= typename ContactForceModel::contactForceStorage;
+	
+	using IdType 			    = uint32;
+
+	using IndexType    		    = uint32;
+    
+    using ContactListType = 
+        sortedContactList<ModelStorage, DefaultExecutionSpace, IdType>;
+
+private:
+
+	const GeometryMotionModel& 			geometryMotion_;
+
+	/// const reference to sphere particles 
+	const grainParticles& 				grnParticles_;
+    
+	uniquePtr<ContactListType> 			ppPairs_ = nullptr;
+
+	uniquePtr<ContactListType>			pwPairs_ = nullptr;
+
+protected:
+
+	void allocatePPPairs();
+
+	void allocatePWPairs();
+
+public:
+
+	TypeInfoTemplate12("boundaryGrainInteraction", ContactForceModel, MotionModel);
+
+	boundaryGrainInteraction(
+		const boundaryBase& boundary,
+		const grainParticles& grnPrtcls,
+		const GeometryMotionModel& geomMotion);
+
+	create_vCtor
+	(
+		BoundaryGrainInteractionType,
+		boundaryBase,
+		(
+			const boundaryBase& boundary,
+			const grainParticles& grnPrtcls,
+			const GeometryMotionModel& geomMotion
+		),
+		(boundary, grnPrtcls, geomMotion)
+	);
+
+	add_vCtor
+	(
+		BoundaryGrainInteractionType,
+		BoundaryGrainInteractionType,
+		boundaryBase
+	);
+
+	~boundaryGrainInteraction()override=default;
+
+	const auto& grnParticles()const
+	{
+		return grnParticles_;
+	}
+
+	const auto& geometryMotion()const
+	{
+		return geometryMotion_;
+	}
+
+	ContactListType& ppPairs()
+	{
+		return ppPairs_();
+	}
+
+	const ContactListType& ppPairs()const
+	{
+		return ppPairs_();
+	}
+
+	ContactListType& pwPairs()
+	{
+		return pwPairs_();
+	}
+
+	const ContactListType& pwPairs()const
+	{
+		return pwPairs_();
+	}
+
+	bool ppPairsAllocated()const
+	{
+		if( ppPairs_)return true;
+		return false;
+	}
+
+	bool pwPairsAllocated()const
+	{
+		if( pwPairs_)return true;
+		return false;
+	}
+
+	virtual
+	bool grainGrainInteraction(
+		real dt,
+		const ContactForceModel& cfModel,
+		uint32 step)
+	{
+		// for default boundary, no thing to be done 
+		return false;
+	}
+
+	bool hearChanges
+	(
+		const timeInfo& ti,
+		const message& msg, 
+    	const anyList& varList
+	) override
+    {
+		if(msg.equivalentTo(message::BNDR_RESET))
+		{
+			return true;
+		}
+		fatalErrorInFunction<<"Event "<< msg.eventNames() << " is not handled !"<<endl;
+		return false;
+	}
+
+	bool isActive()const override
+	{
+		return false;
+	}
+
+	static
+	uniquePtr<BoundaryGrainInteractionType> create(
+		const boundaryBase& boundary,
+		const grainParticles& sphPrtcls,
+		const GeometryMotionModel& geomMotion
+	);
+
+};
+
+}
+
+#include "boundaryGrainInteraction.cpp"
+
+#endif //__boundaryGrainInteraction_hpp__
--- a/src/Interaction/grainInteraction/boundaries/boundaryGrainInteractionList.cpp
+++ b/src/Interaction/grainInteraction/boundaries/boundaryGrainInteractionList.cpp
@ -0,0 +1,23 @@
+
+
+template <typename CFModel, typename gMModel>
+pFlow::boundaryGrainInteractionList<CFModel, gMModel>::boundaryGrainInteractionList
+(
+    const grainParticles &grnPrtcls, 
+    const gMModel &geomMotion
+)
+:
+	boundaryListPtr<boundaryGrainInteraction<CFModel,gMModel>>(),
+	boundaries_(grnPrtcls.pStruct().boundaries())
+{
+	//gSettings::sleepMiliSeconds(1000*pFlowProcessors().localRank());
+	ForAllBoundariesPtr(i, this)
+	{
+		this->set(
+			i,
+			boundaryGrainInteraction<CFModel, gMModel>::create(
+				boundaries_[i],
+				grnPrtcls, 
+				geomMotion));
+	}	
+}
--- a/src/Interaction/grainInteraction/boundaries/boundaryGrainInteractionList.hpp
+++ b/src/Interaction/grainInteraction/boundaries/boundaryGrainInteractionList.hpp
@ -0,0 +1,40 @@
+#ifndef __boundaryGrainInteractionList_hpp__
+#define __boundaryGrainInteractionList_hpp__
+
+
+#include "boundaryList.hpp"
+#include "boundaryListPtr.hpp"
+#include "boundaryGrainInteraction.hpp"
+
+
+namespace pFlow
+{
+
+
+template<typename contactForceModel,typename geometryMotionModel>
+class boundaryGrainInteractionList
+:
+    public boundaryListPtr<boundaryGrainInteraction<contactForceModel,geometryMotionModel>>
+{
+private:
+
+    const boundaryList&         boundaries_;
+
+public:
+
+    boundaryGrainInteractionList(
+        const grainParticles& grnPrtcls,
+		const geometryMotionModel& geomMotion
+    );
+
+    ~boundaryGrainInteractionList()=default;
+
+};
+
+
+
+}
+
+#include "boundaryGrainInteractionList.cpp"
+
+#endif //__boundaryGrainInteractionList_hpp__
--- a/src/Interaction/grainInteraction/boundaries/createBoundaryGrainInteraction.hpp
+++ b/src/Interaction/grainInteraction/boundaries/createBoundaryGrainInteraction.hpp
@ -0,0 +1,31 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+-----------------------------------------------------------------------------*/
+
+#include "boundaryGrainInteraction.hpp"
+#include "periodicBoundaryGrainInteraction.hpp"
+
+#define createBoundaryGrainInteraction(ForceModel,GeomModel) 	\
+	template class pFlow::boundaryGrainInteraction<			\
+	ForceModel,													\
+	GeomModel>;													\
+																\
+	template class pFlow::periodicBoundaryGrainInteraction<	\
+	ForceModel,													\
+	GeomModel>;
+
--- a/src/Interaction/grainInteraction/boundaries/periodicBoundaryGrainInteraction/periodicBoundaryGrainInteraction.cpp
+++ b/src/Interaction/grainInteraction/boundaries/periodicBoundaryGrainInteraction/periodicBoundaryGrainInteraction.cpp
@ -0,0 +1,70 @@
+/*------------------------------- phasicFlow ---------------------------------
+	  O        C enter of
+	 O O       E ngineering and
+	O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions.
+
+  phasicFlow is distributed to help others in their research in the field of
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#include "periodicBoundarySIKernels.hpp"
+
+template <typename cFM, typename gMM>
+pFlow::periodicBoundaryGrainInteraction<cFM, gMM>::periodicBoundaryGrainInteraction(
+	const boundaryBase &boundary,
+	const grainParticles &grnPrtcls,
+	const GeometryMotionModel &geomMotion)
+	: boundaryGrainInteraction<cFM,gMM>(boundary, grnPrtcls, geomMotion),
+	transferVec_(boundary.mirrorBoundary().displacementVectroToMirror())
+{
+	if(boundary.thisBoundaryIndex()%2==1)
+    {
+    	masterInteraction_ = true;
+		this->allocatePPPairs();
+		this->allocatePWPairs();
+	   
+    }
+    else
+    {
+        masterInteraction_ = false;
+    }
+}
+
+template <typename cFM, typename gMM>
+bool pFlow::periodicBoundaryGrainInteraction<cFM, gMM>::grainGrainInteraction
+(
+	real dt,
+	const ContactForceModel &cfModel,
+	uint32 step
+)
+{
+	if(!masterInteraction_) return false;
+	
+	pFlow::periodicBoundarySIKernels::grainGrainInteraction(
+		dt,
+		this->ppPairs(),
+		cfModel,
+		transferVec_,
+		this->boundary().thisPoints(),
+		this->mirrorBoundary().thisPoints(),
+		this->grnParticles().diameter().deviceViewAll(),
+		this->grnParticles().coarseGrainFactor().deviceViewAll(),
+		this->grnParticles().propertyId().deviceViewAll(),
+		this->grnParticles().velocity().deviceViewAll(),
+		this->grnParticles().rVelocity().deviceViewAll(),
+		this->grnParticles().contactForce().deviceViewAll(),
+		this->grnParticles().contactTorque().deviceViewAll());
+
+	return false;
+}
--- a/src/Interaction/grainInteraction/boundaries/periodicBoundaryGrainInteraction/periodicBoundaryGrainInteraction.hpp
+++ b/src/Interaction/grainInteraction/boundaries/periodicBoundaryGrainInteraction/periodicBoundaryGrainInteraction.hpp
@ -0,0 +1,98 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __periodicBoundaryGrainInteraction_hpp__
+#define __periodicBoundaryGrainInteraction_hpp__
+
+#include "boundaryGrainInteraction.hpp"
+
+namespace pFlow
+{
+
+template<typename contactForceModel,typename geometryMotionModel>
+class periodicBoundaryGrainInteraction
+:
+    public boundaryGrainInteraction<contactForceModel, geometryMotionModel>
+{
+public:
+
+    using PBSInteractionType = 
+        periodicBoundaryGrainInteraction<contactForceModel,geometryMotionModel>;
+
+    using BSInteractionType = 
+        boundaryGrainInteraction<contactForceModel, geometryMotionModel>;
+
+    using GeometryMotionModel 	= typename BSInteractionType::GeometryMotionModel;
+	
+	using ContactForceModel 	= typename BSInteractionType::ContactForceModel;
+
+	using MotionModel 			= typename geometryMotionModel::MotionModel;
+
+	using ModelStorage 			= typename ContactForceModel::contactForceStorage;
+	
+	using IdType 			    = typename BSInteractionType::IdType;
+
+	using IndexType    		    = typename BSInteractionType::IndexType;
+    
+    using ContactListType       = typename BSInteractionType::ContactListType; 
+
+private:
+
+    realx3  transferVec_;
+    
+    bool    masterInteraction_;
+public:
+
+    TypeInfoTemplate22("boundaryGrainInteraction", "periodic",ContactForceModel, MotionModel);
+
+	
+    periodicBoundaryGrainInteraction(
+        const boundaryBase& boundary,
+		const grainParticles& grnPrtcls,
+		const GeometryMotionModel& geomMotion
+    );
+
+    add_vCtor
+    (
+        BSInteractionType,
+        PBSInteractionType,
+        boundaryBase
+    );
+    
+    ~periodicBoundaryGrainInteraction()override = default;
+
+    bool grainGrainInteraction(
+        real dt,
+		const ContactForceModel& cfModel,
+        uint32 step)override;
+    
+    bool isActive()const override
+	{
+		return true;
+	}
+	
+};
+
+}
+
+#include "periodicBoundaryGrainInteraction.cpp"
+
+
+#endif //__periodicBoundaryGrainInteraction_hpp__
--- a/src/Interaction/grainInteraction/boundaries/periodicBoundaryGrainInteraction/periodicBoundarySIKernels.hpp
+++ b/src/Interaction/grainInteraction/boundaries/periodicBoundaryGrainInteraction/periodicBoundarySIKernels.hpp
@ -0,0 +1,121 @@
+
+namespace pFlow::periodicBoundarySIKernels
+{
+
+template<typename ContactListType, typename ContactForceModel>
+inline
+void grainGrainInteraction
+(
+    real dt,
+    const ContactListType&              cntctList,
+    const ContactForceModel&            forceModel,
+    const realx3&                       transferVec,
+    const deviceScatteredFieldAccess<realx3>& thisPoints,
+    const deviceScatteredFieldAccess<realx3>& mirrorPoints,
+    const deviceViewType1D<real>& diam,
+    const deviceViewType1D<real>& coarseGrainFactor,
+    const deviceViewType1D<uint32>& propId,
+    const deviceViewType1D<realx3>& vel,
+    const deviceViewType1D<realx3>& rVel,
+    const deviceViewType1D<realx3>& cForce,
+    const deviceViewType1D<realx3>& cTorque
+)
+{
+    
+    using ValueType = typename ContactListType::ValueType;
+    uint32 ss = cntctList.size();
+    uint32 lastItem = cntctList.loopCount();
+    if(lastItem == 0u)return;
+
+    Kokkos::parallel_for(
+        "pFlow::periodicBoundarySIKernels::grainGrainInteraction",
+        deviceRPolicyDynamic(0,lastItem),
+        LAMBDA_HD(uint32 n)
+        {
+
+        if(!cntctList.isValid(n))return;
+
+            auto [i,j] = cntctList.getPair(n);
+            uint32 ind_i = thisPoints.index(i);
+            uint32 ind_j = mirrorPoints.index(j);
+
+            real Ri = 0.5*diam[ind_i];
+            real Rj = 0.5*diam[ind_j];
+            real cGFi = coarseGrainFactor[ind_i];
+            real cGFj = coarseGrainFactor[ind_j];
+            realx3 xi = thisPoints.field()[ind_i];
+            realx3 xj = mirrorPoints.field()[ind_j]+transferVec;
+            real dist = length(xj-xi);
+            real ovrlp = (Ri+Rj) - dist;
+            
+            if( ovrlp >0.0 )
+            {
+                auto Nij = (xj-xi)/dist;
+                auto wi = rVel[ind_i];
+                auto wj = rVel[ind_j];
+                auto Vr = vel[ind_i] - vel[ind_j] + cross((Ri*wi+Rj*wj), Nij);
+                
+                auto history = cntctList.getValue(n);
+
+                int32 propId_i = propId[ind_i];
+                int32 propId_j = propId[ind_j];
+
+                realx3 FCn, FCt, Mri, Mrj, Mij, Mji;
+
+                // calculates contact force 
+                forceModel.contactForce(
+                    dt, i, j,
+                    propId_i, propId_j,
+                    Ri, Rj, cGFi , cGFj ,
+                    ovrlp,
+                    Vr, Nij,
+                    history,
+                    FCn, FCt);
+
+                forceModel.rollingFriction(
+                    dt, i, j,
+                    propId_i, propId_j,
+                    Ri, Rj, cGFi , cGFj ,
+                    wi, wj,
+                    Nij,
+                    FCn,
+                    Mri, Mrj);
+
+                auto M = cross(Nij,FCt);
+                Mij = Ri*M+Mri;
+                Mji = Rj*M+Mrj;
+                
+                auto FC = FCn + FCt;
+                
+
+                Kokkos::atomic_add(&cForce[ind_i].x_,FC.x_);
+                Kokkos::atomic_add(&cForce[ind_i].y_,FC.y_);
+                Kokkos::atomic_add(&cForce[ind_i].z_,FC.z_);
+
+                Kokkos::atomic_add(&cForce[ind_j].x_,-FC.x_);
+                Kokkos::atomic_add(&cForce[ind_j].y_,-FC.y_);
+                Kokkos::atomic_add(&cForce[ind_j].z_,-FC.z_);
+
+                Kokkos::atomic_add(&cTorque[ind_i].x_, Mij.x_);
+                Kokkos::atomic_add(&cTorque[ind_i].y_, Mij.y_);
+                Kokkos::atomic_add(&cTorque[ind_i].z_, Mij.z_);
+
+                Kokkos::atomic_add(&cTorque[ind_j].x_, Mji.x_);
+                Kokkos::atomic_add(&cTorque[ind_j].y_, Mji.y_);
+                Kokkos::atomic_add(&cTorque[ind_j].z_, Mji.z_);
+                
+
+                cntctList.setValue(n,history);
+
+            }
+            else
+            {
+                cntctList.setValue(n, ValueType());
+            }
+
+        });
+    Kokkos::fence();
+}
+
+
+} //pFlow::periodicBoundarySIKernels
--- a/src/Interaction/grainInteraction/grainInteraction/grainInteraction.cpp
+++ b/src/Interaction/grainInteraction/grainInteraction/grainInteraction.cpp
@ -0,0 +1,355 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+bool pFlow::grainInteraction<cFM,gMM, cLT>::createGrainInteraction()
+{
+	
+	realVector_D rhoD("densities", this->densities());
+
+	auto modelDict = this->subDict("model");
+
+	forceModel_ = makeUnique<ContactForceModel>(
+		this->numMaterials(),
+		rhoD.deviceView(),
+		modelDict );
+
+
+	uint32 nPrtcl = grnParticles_.size();
+
+	contactSearch_ = contactSearch::create(
+	subDict("contactSearch"),
+	grnParticles_.extendedDomain().domainBox(),
+	grnParticles_,
+	geometryMotion_,
+	timers());
+
+	ppContactList_ = makeUnique<ContactListType>("Grain-Grain",nPrtcl+1);
+	
+	pwContactList_ = makeUnique<ContactListType>("Grain-wall",nPrtcl/5+1);
+
+	return true;
+}
+
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+bool pFlow::grainInteraction<cFM,gMM, cLT>::grainGrainInteraction()
+{
+	auto lastItem = ppContactList_().loopCount();
+
+	// create the kernel functor 
+	pFlow::grainInteractionKernels::ppInteractionFunctor 
+		ppInteraction(
+			this->dt(),
+			this->forceModel_(),
+			ppContactList_(), // to be read
+			grnParticles_.diameter().deviceViewAll(),
+			grnParticles_.coarseGrainFactor().deviceViewAll(),
+			grnParticles_.propertyId().deviceViewAll(),
+			grnParticles_.pointPosition().deviceViewAll(),
+			grnParticles_.velocity().deviceViewAll(),
+			grnParticles_.rVelocity().deviceViewAll(),
+			grnParticles_.contactForce().deviceViewAll(),
+			grnParticles_.contactTorque().deviceViewAll()
+			);
+	
+	Kokkos::parallel_for(
+		"ppInteraction",
+		rpPPInteraction(0,lastItem),
+		ppInteraction
+		);
+
+	Kokkos::fence();	
+
+	return true;
+}
+
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+bool pFlow::grainInteraction<cFM,gMM, cLT>::grainWallInteraction()
+{
+	
+	uint32 lastItem = pwContactList_().loopCount();
+	uint32 iter = this->currentIter();
+	real t = this->currentTime();
+	real dt = this->dt();
+
+	pFlow::grainInteractionKernels::pwInteractionFunctor
+		pwInteraction(
+			dt,
+			this->forceModel_(),
+			pwContactList_(),
+			geometryMotion_.getTriangleAccessor(), 
+			geometryMotion_.getModel(iter, t, dt) , 
+			grnParticles_.diameter().deviceViewAll() ,
+			grnParticles_.coarseGrainFactor().deviceViewAll() ,
+			grnParticles_.propertyId().deviceViewAll(),
+			grnParticles_.pointPosition().deviceViewAll(),
+			grnParticles_.velocity().deviceViewAll(),
+			grnParticles_.rVelocity().deviceViewAll() ,
+			grnParticles_.contactForce().deviceViewAll(),
+			grnParticles_.contactTorque().deviceViewAll() ,
+			geometryMotion_.triMotionIndex().deviceViewAll(),
+			geometryMotion_.propertyId().deviceViewAll(),
+			geometryMotion_.contactForceWall().deviceViewAll()
+		);
+
+	Kokkos::parallel_for(
+		"",
+		rpPWInteraction(0,lastItem),
+		pwInteraction
+		);
+
+	
+	Kokkos::fence();
+
+	return true;
+}
+
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+pFlow::grainInteraction<cFM,gMM, cLT>::grainInteraction
+(
+	systemControl& control,
+	const particles& prtcl,
+	const geometry& geom
+)
+:
+	interaction(control, prtcl, geom),
+	geometryMotion_(dynamic_cast<const GeometryMotionModel&>(geom)),
+	grnParticles_(dynamic_cast<const grainParticles&>(prtcl)),
+	boundaryInteraction_(grnParticles_,geometryMotion_),
+	ppInteractionTimer_("grain-graine interaction (internal)", &this->timers()),
+	pwInteractionTimer_("grain-wall interaction (internal)", &this->timers()),
+	boundaryInteractionTimer_("grain-grain interaction (boundary)",&this->timers()),
+	contactListMangementTimer_("list management (interal)", &this->timers()),
+	contactListMangementBoundaryTimer_("list management (boundary)", &this->timers())
+{
+	
+	if(!createGrainInteraction())
+	{
+		fatalExit;
+	}
+
+	for(uint32 i=0; i<6; i++)
+	{
+		activeBoundaries_[i] = boundaryInteraction_[i].ppPairsAllocated();
+	}
+}
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+bool pFlow::grainInteraction<cFM,gMM, cLT>::beforeIteration()
+{
+	return true;
+}
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+bool pFlow::grainInteraction<cFM,gMM, cLT>::iterate()
+{
+	
+	timeInfo ti = this->TimeInfo();
+	auto iter = ti.iter();
+	auto t = ti.t();
+	auto dt = ti.dt();
+
+	auto& contactSearchRef = contactSearch_();
+
+	bool broadSearch = contactSearchRef.enterBroadSearch(ti);
+	bool broadSearchBoundary = contactSearchRef.enterBroadSearchBoundary(ti);
+
+	/// update boundaries of the fields that are being used by inreaction 
+	grnParticles_.diameter().updateBoundaries(DataDirection::SlaveToMaster);
+	grnParticles_.velocity().updateBoundaries(DataDirection::SlaveToMaster);
+	grnParticles_.rVelocity().updateBoundaries(DataDirection::SlaveToMaster);
+	grnParticles_.propertyId().updateBoundaries(DataDirection::SlaveToMaster);
+	
+	/// lists 
+	if(broadSearch)
+	{
+		contactListMangementTimer_.start();
+		ComputationTimer().start();
+			ppContactList_().beforeBroadSearch();
+			pwContactList_().beforeBroadSearch();
+		ComputationTimer().end();
+		contactListMangementTimer_.pause();
+	} 
+
+	if(broadSearchBoundary)
+	{
+		contactListMangementBoundaryTimer_.start();
+		ComputationTimer().start();
+		for(uint32 i=0; i<6u; i++)
+		{
+			if(activeBoundaries_[i])
+			{
+				auto& BI = boundaryInteraction_[i];
+				BI.ppPairs().beforeBroadSearch();
+				BI.pwPairs().beforeBroadSearch();
+			} 
+		}
+		ComputationTimer().end();
+		contactListMangementBoundaryTimer_.pause();	
+	}
+	
+	if( grnParticles_.numActive()<=0)return true;
+	
+	ComputationTimer().start();
+	if( !contactSearchRef.broadSearch(
+			ti,		
+			ppContactList_(),
+			pwContactList_()) )
+	{
+		fatalErrorInFunction<<
+		"unable to perform broadSearch.\n";
+		fatalExit;
+	}
+	
+	for(uint32 i=0; i<6u; i++)
+	{
+		if(activeBoundaries_[i])
+		{
+			auto& BI = boundaryInteraction_[i];
+			if(!contactSearchRef.boundaryBroadSearch(
+				i,
+				ti,
+				BI.ppPairs(),
+				BI.pwPairs())
+			)
+			{
+				fatalErrorInFunction<<
+				"failed to perform broadSearch for boundary index "<<i<<endl;
+				return false;
+			}
+		}
+	}
+	ComputationTimer().end();
+	
+	if(broadSearch && contactSearchRef.performedSearch())
+	{
+		contactListMangementTimer_.resume();
+		ComputationTimer().start();
+			ppContactList_().afterBroadSearch();
+			pwContactList_().afterBroadSearch();
+		ComputationTimer().end();
+		contactListMangementTimer_.end();
+	}
+
+	if(broadSearchBoundary && contactSearchRef.performedSearchBoundary())
+	{
+		contactListMangementBoundaryTimer_.resume();
+		ComputationTimer().start();
+		for(uint32 i=0; i<6u; i++)
+		{
+			if(activeBoundaries_[i])
+			{
+				auto& BI = boundaryInteraction_[i];
+				BI.ppPairs().afterBroadSearch();
+				BI.pwPairs().afterBroadSearch();
+			}
+		}
+		ComputationTimer().end();
+		contactListMangementBoundaryTimer_.end();
+	}
+	
+	/// peform contact search on boundareis with active contact search (master boundaries)
+	auto requireStep = boundariesMask<6>(true);
+	const auto& cfModel = this->forceModel_();
+	uint32 step=1;
+	boundaryInteractionTimer_.start();
+	ComputationTimer().start();
+	while(requireStep.anyElement(true) && step <= 10)
+	{
+		for(uint32 i=0; i<6u; i++)
+		{
+			if(requireStep[i] )
+			{
+				requireStep[i] = boundaryInteraction_[i].grainGrainInteraction(
+					dt, 
+					this->forceModel_(),
+					step
+				);
+			}		
+		}
+		step++;
+	}
+	ComputationTimer().end();
+	boundaryInteractionTimer_.pause();
+	
+
+	ppInteractionTimer_.start();
+	ComputationTimer().start();
+		grainGrainInteraction();
+	ComputationTimer().end();
+	ppInteractionTimer_.end();
+
+	
+	pwInteractionTimer_.start();
+	ComputationTimer().start();
+		grainWallInteraction();
+	ComputationTimer().start();
+	pwInteractionTimer_.end();
+
+	{
+	boundaryInteractionTimer_.resume();
+	ComputationTimer().start();
+	auto requireStep = boundariesMask<6>(true);
+
+	uint32 step = 11;
+	const auto& cfModel = this->forceModel_();
+	while( requireStep.anyElement(true) && step < 20 )
+	{
+		for(uint32 i=0; i<6u; i++)
+		{
+			if(requireStep[i])
+			{
+				requireStep[i] = boundaryInteraction_[i].grainGrainInteraction(
+					dt, 
+					cfModel,
+					step
+				);
+			}		
+		}
+		step++;
+	}
+	ComputationTimer().end();
+	boundaryInteractionTimer_.end();
+	}
+	
+	return true;
+}
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+bool pFlow::grainInteraction<cFM,gMM, cLT>::afterIteration()
+{
+	return true;
+}
+
+template<typename cFM,typename gMM,template <class, class, class> class cLT>
+bool pFlow::grainInteraction<cFM,gMM, cLT>::hearChanges
+(
+	const timeInfo& ti,
+	const message& msg, 
+	const anyList& varList
+)
+{
+	fatalErrorInFunction<<"Event "<< msg.eventNames()<<
+	" is not handled in grainInteraction"<<endl;
+	return false;
+}
--- a/src/Interaction/grainInteraction/grainInteraction/grainInteraction.hpp
+++ b/src/Interaction/grainInteraction/grainInteraction/grainInteraction.hpp
@ -0,0 +1,167 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __grainInteraction_hpp__ 
+#define __grainInteraction_hpp__
+
+#include "interaction.hpp"
+#include "grainParticles.hpp"
+#include "boundaryGrainInteractionList.hpp"
+#include "grainInteractionKernels.hpp"
+#include "boundariesMask.hpp"
+#include "MPITimer.hpp"
+//#include "unsortedContactList.hpp"
+
+
+
+namespace pFlow
+{
+
+template<
+	typename contactForceModel,
+	typename geometryMotionModel,
+	template <class, class, class> class contactListType>
+class grainInteraction
+:
+	public interaction
+{
+public:
+
+	using GeometryMotionModel 	= geometryMotionModel;
+	
+	using ContactForceModel 	= contactForceModel;
+
+	using MotionModel 			= typename geometryMotionModel::MotionModel;
+
+	using ModelStorage 			= typename ContactForceModel::contactForceStorage;
+
+	using BoundaryListType 		= boundaryGrainInteractionList<ContactForceModel,GeometryMotionModel>;
+	
+	using IdType 			= uint32;
+
+	using IndexType    		= uint32;
+
+	using ContactListType 	= 
+			contactListType<ModelStorage, DefaultExecutionSpace, IdType>;
+
+	//using BoundaryContactListType = unsortedContactList<ModelStorage, DefaultExecutionSpace, IdType>;
+	
+
+
+private:
+	
+	/// const reference to geometry
+	const GeometryMotionModel& 			geometryMotion_;
+
+	/// const reference to particles 
+	const grainParticles& 				grnParticles_;
+
+	/// particle-particle and particle-wall interactions at boundaries 
+	BoundaryListType 					boundaryInteraction_;	
+
+	/// a mask for active boundaries (boundaries with intreaction)
+	boundariesMask<6> 					activeBoundaries_;
+
+	/// contact search object for pp and pw interactions 
+	uniquePtr<contactSearch> 			contactSearch_ = nullptr;
+
+	/// contact force model 
+	uniquePtr<ContactForceModel>  		forceModel_ 	= nullptr;
+
+	/// contact list for particle-particle interactoins (keeps the history)
+	uniquePtr<ContactListType> 			ppContactList_ = nullptr;
+
+	/// contact list for particle-wall interactions (keeps the history)
+	uniquePtr<ContactListType> 			pwContactList_ = nullptr;
+
+
+	/// timer for particle-particle interaction computations
+	Timer 		ppInteractionTimer_;
+
+	/// timer for particle-wall interaction computations
+	Timer       pwInteractionTimer_;
+
+	/// timer for boundary interaction time 
+	Timer 		boundaryInteractionTimer_;
+
+	/// timer for managing contact lists (only inernal points)
+	Timer 		contactListMangementTimer_;	
+
+	Timer 		contactListMangementBoundaryTimer_;
+
+	
+
+	bool createGrainInteraction();
+
+	bool grainGrainInteraction();
+
+	bool grainWallInteraction();
+
+	/// range policy for p-p interaction execution 
+	using rpPPInteraction = 
+		Kokkos::RangePolicy<Kokkos::IndexType<uint32>, Kokkos::Schedule<Kokkos::Dynamic>>;
+
+	/// range policy for p-w interaction execution 
+	using rpPWInteraction = rpPPInteraction;
+
+public:
+
+	TypeInfoTemplate13("grainInteraction", ContactForceModel, MotionModel, ContactListType);
+
+	/// Constructor from components
+	grainInteraction(
+		systemControl& control,
+		const particles& prtcl,
+		const geometry& geom);
+	
+
+	/// Add virtual constructor 
+	add_vCtor
+	(
+		interaction,
+		grainInteraction, 
+		systemControl
+	);
+
+	/// This is called in time loop, before iterate. (overriden from demComponent)
+	bool beforeIteration() override;
+	
+	/// This is called in time loop. Perform the main calculations 
+	/// when the component should evolve along time. (overriden from demComponent)
+	bool iterate() override; 
+	
+	/// This is called in time loop, after iterate. (overriden from demComponent)
+	bool afterIteration() override;
+
+	/// Check for changes in the point structures. (overriden from observer)
+	bool hearChanges(
+		const timeInfo& ti,
+		const message& msg, 
+		const anyList& varList)override;
+	
+	
+};
+
+
+}
+
+#include "grainInteraction.cpp"
+
+#endif //__grainInteraction_hpp__
--- a/src/Interaction/grainInteraction/grainInteraction/grainInteractionKernels.hpp
+++ b/src/Interaction/grainInteraction/grainInteraction/grainInteractionKernels.hpp
@ -0,0 +1,337 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __grainInteractionKernels_hpp__
+#define __grainInteractionKernels_hpp__
+
+
+#include "grainTriSurfaceContact.hpp"
+
+namespace pFlow::grainInteractionKernels
+{
+
+template<
+	typename ContactForceModel, 
+	typename ContactListType>
+struct ppInteractionFunctor
+{
+
+	using PairType = typename ContactListType::PairType;
+	using ValueType = typename ContactListType::ValueType;
+
+	real dt_;
+
+	ContactForceModel forceModel_;
+	ContactListType   tobeFilled_;
+
+	deviceViewType1D<real>  		diam_;
+	deviceViewType1D<real>  		coarseGrainFactor_;
+	deviceViewType1D<uint32> 		propId_;
+	deviceViewType1D<realx3>  		pos_;
+	deviceViewType1D<realx3>  		lVel_;
+	deviceViewType1D<realx3>  		rVel_;
+	deviceViewType1D<realx3>	cForce_;
+	deviceViewType1D<realx3>	cTorque_;
+
+
+	ppInteractionFunctor(
+		real dt,
+		ContactForceModel 		forceModel,
+		ContactListType 		tobeFilled,
+		deviceViewType1D<real>  		diam,
+		deviceViewType1D<real>  coarseGrainFactor,
+		deviceViewType1D<uint32> 		propId,
+		deviceViewType1D<realx3>  		pos,
+		deviceViewType1D<realx3>  		lVel,
+		deviceViewType1D<realx3>  		rVel,
+		deviceViewType1D<realx3>		cForce,
+		deviceViewType1D<realx3> 		cTorque )
+	:
+		dt_(dt),
+		forceModel_(forceModel),
+		tobeFilled_(tobeFilled),
+		diam_(diam),
+		coarseGrainFactor_(coarseGrainFactor),
+		propId_(propId),
+		pos_(pos),
+		lVel_(lVel),
+		rVel_(rVel),
+		cForce_(cForce), // this is converted to an atomic vector 
+		cTorque_(cTorque) // this is converted to an atomic vector 
+	{}
+
+	INLINE_FUNCTION_HD
+	void operator()(const uint32 n)const
+	{
+		
+		if(!tobeFilled_.isValid(n))return;
+
+		auto [i,j] = tobeFilled_.getPair(n);
+		
+		real Ri = 0.5*diam_[i];
+		real Rj = 0.5*diam_[j];
+
+		real cGFi = coarseGrainFactor_[j];
+		real cGFj = coarseGrainFactor_[j];
+
+		realx3 xi = pos_[i];
+		realx3 xj = pos_[j];
+		real dist = length(xj-xi);
+		real ovrlp = (Ri+Rj) - dist;
+		
+		if( ovrlp >0.0 )
+		{
+			
+			auto Vi = lVel_[i];
+			auto Vj = lVel_[j];
+			auto wi = rVel_[i];
+			auto wj = rVel_[j];
+			auto Nij = (xj-xi)/dist;
+			auto Vr = Vi - Vj + cross((Ri*wi+Rj*wj), Nij);
+			
+			auto history = tobeFilled_.getValue(n);
+
+			int32 propId_i = propId_[i];
+			int32 propId_j = propId_[j];
+
+			realx3 FCn, FCt, Mri, Mrj, Mij, Mji;
+
+			// calculates contact force 
+			forceModel_.contactForce(
+				dt_, i, j,
+				propId_i, propId_j,
+				Ri, Rj, cGFi , cGFj ,
+				ovrlp,
+				Vr, Nij,
+				history,
+				FCn, FCt
+				);
+
+			forceModel_.rollingFriction(
+				dt_, i, j,
+				propId_i, propId_j,
+				Ri, Rj, cGFi , cGFj , 
+				wi, wj,
+				Nij,
+				FCn,
+				Mri, Mrj
+				);
+
+			auto M = cross(Nij,FCt);
+			Mij = Ri*M+Mri;
+			Mji = Rj*M+Mrj;
+			
+			auto FC = FCn + FCt;
+			
+			Kokkos::atomic_add(&cForce_[i].x_,FC.x_);
+			Kokkos::atomic_add(&cForce_[i].y_,FC.y_);
+			Kokkos::atomic_add(&cForce_[i].z_,FC.z_);
+
+			Kokkos::atomic_add(&cForce_[j].x_,-FC.x_);
+			Kokkos::atomic_add(&cForce_[j].y_,-FC.y_);
+			Kokkos::atomic_add(&cForce_[j].z_,-FC.z_);
+
+			Kokkos::atomic_add(&cTorque_[i].x_, Mij.x_);
+			Kokkos::atomic_add(&cTorque_[i].y_, Mij.y_);
+			Kokkos::atomic_add(&cTorque_[i].z_, Mij.z_);
+
+			Kokkos::atomic_add(&cTorque_[j].x_, Mji.x_);
+			Kokkos::atomic_add(&cTorque_[j].y_, Mji.y_);
+			Kokkos::atomic_add(&cTorque_[j].z_, Mji.z_);
+			
+
+			tobeFilled_.setValue(n,history);
+
+		}
+		else
+		{
+			tobeFilled_.setValue(n, ValueType());
+		}
+
+	}
+};
+
+
+template<
+	typename ContactForceModel, 
+	typename ContactListType,
+	typename TraingleAccessor,
+	typename MotionModel>
+struct pwInteractionFunctor
+{
+	using PairType = typename ContactListType::PairType;
+	using ValueType = typename ContactListType::ValueType;
+
+	real dt_;
+
+	ContactForceModel 	forceModel_;
+	ContactListType   	tobeFilled_;
+
+	TraingleAccessor 		triangles_;
+	MotionModel  			motionModel_;
+
+	deviceViewType1D<real>  	diam_;
+	deviceViewType1D<real>  	coarseGrainFactor_;
+	deviceViewType1D<uint32>	propId_;
+	deviceViewType1D<realx3>  	pos_;
+	deviceViewType1D<realx3>  	lVel_;
+	deviceViewType1D<realx3>  	rVel_;
+	deviceViewType1D<realx3>	cForce_;
+	deviceViewType1D<realx3>	cTorque_;
+	deviceViewType1D<uint32> 	wTriMotionIndex_;
+	deviceViewType1D<uint32>    wPropId_;
+	deviceViewType1D<realx3>    wCForce_;
+	
+
+	pwInteractionFunctor(
+		real dt,
+		ContactForceModel 		forceModel,
+		ContactListType   		tobeFilled,
+		TraingleAccessor		triangles,
+		MotionModel 			motionModel ,
+		deviceViewType1D<real>  	diam ,
+		deviceViewType1D<real>  	coarseGrainFactor,
+		deviceViewType1D<uint32>  	propId,
+		deviceViewType1D<realx3>   	pos ,
+		deviceViewType1D<realx3>   	lVel,
+		deviceViewType1D<realx3>   	rVel,
+		deviceViewType1D<realx3> 	cForce,
+		deviceViewType1D<realx3> 	cTorque ,
+		deviceViewType1D<uint32> 	wTriMotionIndex,
+		deviceViewType1D<uint32>    wPropId,
+		deviceViewType1D<realx3>    wCForce)
+	:
+		dt_(dt),
+		forceModel_(forceModel),
+		tobeFilled_(tobeFilled),
+		triangles_(triangles) ,
+		motionModel_(motionModel) ,
+		diam_(diam) ,
+		coarseGrainFactor_(coarseGrainFactor),
+		propId_(propId),
+		pos_(pos) ,
+		lVel_(lVel),
+		rVel_(rVel) ,
+		cForce_(cForce),
+		cTorque_(cTorque) ,
+		wTriMotionIndex_(wTriMotionIndex) ,
+		wPropId_(wPropId),
+		wCForce_(wCForce)
+	{}
+
+	INLINE_FUNCTION_HD
+	void operator()(const int32 n)const
+	{
+
+		if(!tobeFilled_.isValid(n))return;
+
+		auto [i,tj] = tobeFilled_.getPair(n);
+		
+		real Ri = 0.5*diam_[i];
+		real Rj = 10000.0;
+		real cGFi = coarseGrainFactor_[i];
+		real cGFj = coarseGrainFactor_[i];
+		realx3 xi = pos_[i];
+		
+		realx3x3 tri = triangles_(tj); 
+		real ovrlp;
+		realx3 Nij, cp;
+
+		if(	pFlow::grnTriInteraction::isGrainInContactBothSides(
+			tri, xi, Ri, ovrlp, Nij, cp) )
+		{
+			auto  Vi = lVel_[i];
+			auto wi = rVel_[i];
+
+			int32 mInd	= wTriMotionIndex_[tj];
+			
+			auto Vw = motionModel_(mInd, cp);
+			
+			//output<< "par-wall index "<< i<<" - "<< tj<<endl;
+			
+			auto Vr = Vi - Vw + cross(Ri*wi, Nij);
+			
+			auto history = tobeFilled_.getValue(n);
+
+			int32 propId_i = propId_[i];
+			int32 wPropId_j = wPropId_[tj];
+
+			realx3 FCn, FCt, Mri, Mrj, Mij;
+			//output<< "before "<<history.overlap_t_<<endl;
+			// calculates contact force 
+			forceModel_.contactForce(
+				dt_, i, tj,
+				propId_i, wPropId_j,
+				Ri, Rj, cGFi , cGFj ,
+				ovrlp,
+				Vr, Nij,
+				history,
+				FCn, FCt
+				);
+
+			//output<< "after "<<history.overlap_t_<<endl;
+
+			forceModel_.rollingFriction(
+				dt_, i, tj,
+				propId_i, wPropId_j,
+				Ri, Rj, cGFi , cGFj ,
+				wi, 0.0,
+				Nij,
+				FCn,
+				Mri, Mrj
+				);
+
+			auto M = cross(Nij,FCt);
+			Mij = Ri*M+Mri;
+			//output<< "FCt = "<<FCt <<endl;
+			//output<< "FCn = "<<FCn <<endl;
+			//output<<"propId i, tj"<< propId_i << " "<<wPropId_j<<endl;
+			//output<<"par i , wj"<< i<<" "<< tj<<endl;
+
+			auto FC = FCn + FCt;
+
+			Kokkos::atomic_add(&cForce_[i].x_,FC.x_);
+			Kokkos::atomic_add(&cForce_[i].y_,FC.y_);
+			Kokkos::atomic_add(&cForce_[i].z_,FC.z_);
+
+			Kokkos::atomic_add(&wCForce_[tj].x_,-FC.x_);
+			Kokkos::atomic_add(&wCForce_[tj].y_,-FC.y_);
+			Kokkos::atomic_add(&wCForce_[tj].z_,-FC.z_);
+
+			
+			Kokkos::atomic_add(&cTorque_[i].x_, Mij.x_);
+			Kokkos::atomic_add(&cTorque_[i].y_, Mij.y_);
+			Kokkos::atomic_add(&cTorque_[i].z_, Mij.z_);
+
+			tobeFilled_.setValue(n,history);
+
+		}
+		else
+		{
+			tobeFilled_.setValue(n,ValueType());
+		}
+		
+	}
+
+};
+
+} 
+
+#endif //__grainInteractionKernels_hpp__
--- a/src/Interaction/grainInteraction/grainInteraction/grainTriSurfaceContact.hpp
+++ b/src/Interaction/grainInteraction/grainInteraction/grainTriSurfaceContact.hpp
@ -0,0 +1,231 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+
+#ifndef __grainTriSurfaceContact_hpp__
+#define __grainTriSurfaceContact_hpp__
+
+#include "triWall.hpp"
+#include "pLine.hpp"
+
+namespace pFlow::grnTriInteraction
+{
+
+INLINE_FUNCTION_HD
+bool pointInPlane(
+	const realx3& p1,
+	const realx3& p2,
+	const realx3& p3,
+	const realx3& p )
+{
+
+	realx3 p1p = p1 - p;
+	realx3 p2p = p2 - p;
+	realx3 p3p = p3 - p;
+
+	real p1p2 = dot(p1p, p2p);
+	real p2p3 = dot(p2p, p3p);
+	real p2p2 = dot(p2p, p2p);
+	real p1p3 = dot(p1p, p3p);
+
+	// first condition u.v < 0
+	// u.v = [(p1-p)x(p2-p)].[(p2-p)x(p3-p)] = (p1p.p2p)(p2p.p3p) - (p2p.p2p)(p1p.p3p) 
+	if (p1p2*p2p3 - p2p2*p1p3 < 0.0) return false;
+
+
+	// second condition u.w < 0
+	// u.w = [(p1-p)x(p2-p)].[(p3-p)x(p1-p)] = (p1p.p3p)(p2p.p1p) - (p2p.p3p)(p1p.p1p)
+	real p1p1 = dot(p1p, p1p);
+	if (p1p3*p1p2 - p2p3*p1p1 < (0.0)) return false;
+
+	return true;
+}
+
+INLINE_FUNCTION_HD
+void cramerRule2(real A[2][2], real B[2], real & x1, real &x2)
+{
+	real det = (A[0][0] * A[1][1] - A[1][0]*A[0][1]);
+	x1 = (B[0]*A[1][1] - B[1]*A[0][1]) / det;
+	x2 = (A[0][0] * B[1] - A[1][0] * B[0])/ det;
+}
+
+INLINE_FUNCTION_HD
+bool pointInPlane(
+	const realx3& p1,
+	const realx3& p2,
+	const realx3& p3,
+	const realx3 &p,
+	int32 &Ln)
+{
+	realx3 v0 = p2 - p1;
+	realx3 v1 = p3 - p1;
+	realx3 v2 = p - p1;
+
+	real A[2][2] = { dot(v0, v0), dot(v0, v1), dot(v1, v0), dot(v1, v1) };
+	real B[2] = { dot(v0, v2), dot(v1, v2) };
+	real nu, w;
+
+	cramerRule2(A, B, nu, w);
+	real nuW = nu + w;
+		
+	
+	if (nuW > 1) 
+	{
+		Ln = 2;	return true;
+	}
+	else if (nuW >= 0)
+	{
+		if (nu >= 0 && w >= 0)
+		{
+			Ln = 0;	return true;
+		}
+		if (nu > 0 && w < 0)
+		{
+			Ln = 1;	return true;
+		}
+		if (nu < 0 && w > 0)
+		{
+			Ln = 3;	return true;
+		}
+	}
+	else
+	{
+		Ln = 1;	return true;
+	}
+	
+	return false;
+}
+
+INLINE_FUNCTION_HD
+bool isGrainInContactActiveSide(
+	const realx3& p1,
+	const realx3& p2,
+	const realx3& p3,
+	const realx3& cntr,
+	real 	rad,
+	real& 	ovrlp,
+	realx3& norm,
+	realx3& cp)
+{
+	
+	triWall wall(true, p1,p2,p3);
+
+	real dist = wall.normalDistFromWall(cntr);
+	
+	if(dist < 0.0 )return false;
+
+	ovrlp = rad - dist;
+
+	if (ovrlp > 0)
+	{
+		realx3 ptOnPlane = wall.nearestPointOnWall(cntr);
+		
+		if (pointInPlane(p1, p2, p3, ptOnPlane))
+		{
+			cp = ptOnPlane;
+			norm = -wall.n_;
+			return true;
+		}
+
+		realx3 lnv;
+		
+		if (pLine(p1,p2).lineGrainCheck(cntr, rad, lnv, cp, ovrlp))
+		{
+			norm = -lnv;
+			return true;
+		}
+
+		if ( pLine(p2,p3).lineGrainCheck(cntr, rad, lnv, cp, ovrlp))
+		{
+			norm = -lnv;
+			return true;
+		}
+
+		if ( pLine(p3,p1).lineGrainCheck(cntr, rad, lnv, cp, ovrlp))
+		{
+			norm = -lnv;
+			return true;
+		}
+	}
+			
+	return false;
+}
+
+INLINE_FUNCTION_HD
+bool isGrainInContactBothSides(
+	const realx3x3& tri,
+	const realx3& cntr,
+	real 	Rad,
+	real& 	ovrlp,
+	realx3& norm,
+	realx3& cp)
+{
+	
+	triWall wall(true, tri.x_,tri.y_,tri.z_);
+
+	real dist = wall.normalDistFromWall(cntr);
+	
+	
+	ovrlp = Rad - abs(dist);
+
+	if (ovrlp > 0)
+	{
+		realx3 ptOnPlane = wall.nearestPointOnWall(cntr);
+		
+		if (pointInPlane(tri.x_,tri.y_,tri.z_,ptOnPlane))
+		{
+			cp = ptOnPlane;
+			
+			if(dist >= 0.0)
+				norm = -wall.n_;
+			else
+				norm = wall.n_;
+			return true;
+		}
+
+		realx3 lnv;
+		
+		if (pLine(tri.x_, tri.y_).lineGrainCheck(cntr, Rad, lnv, cp, ovrlp))
+		{
+			norm = -lnv;
+			return true;
+		}
+
+		if ( pLine(tri.y_, tri.z_).lineGrainCheck(cntr, Rad, lnv, cp, ovrlp))
+		{
+			norm = -lnv;
+			return true;
+		}
+
+		if ( pLine(tri.z_, tri.x_).lineGrainCheck(cntr, Rad, lnv, cp, ovrlp))
+		{
+			norm = -lnv;
+			return true;
+		}
+	}
+			
+	return false;
+}
+
+
+} // pFlow::grnTriInteraction
+
+
+#endif //__grainTriSurfaceContact_hpp__
--- a/src/Interaction/grainInteraction/grainInteraction/pLine.hpp
+++ b/src/Interaction/grainInteraction/grainInteraction/pLine.hpp
@ -0,0 +1,107 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __pLine_hpp__
+#define __pLine_hpp__
+
+#include "types.hpp"
+
+namespace pFlow::grnTriInteraction
+{
+
+struct pLine
+{
+
+	realx3 p1_; // point 1
+	realx3 p2_; // piont 2
+	realx3 v_;  // direction vector 
+	real  L_;  // line lenght
+
+	INLINE_FUNCTION_HD
+	pLine(){}
+
+	INLINE_FUNCTION_HD 
+	pLine(const realx3 &p1, const realx3 &p2)
+	:
+		p1_(p1),
+		p2_(p2),
+		v_(p2-p1),
+		L_(length(v_))
+	{}
+	 	
+	// get a point on the line based on input  0<= t <= 1
+	INLINE_FUNCTION_HD 
+	realx3 point(real t)const {
+		return v_ * t + p1_;
+		}
+
+	// return the projected point of point p on line
+	INLINE_FUNCTION_HD
+	realx3 projectPoint(const realx3 &p) const
+	{
+		return point(projectNormLength(p));
+	}
+
+	// calculates the normalized distance between projected p and p1 
+	INLINE_FUNCTION_HD
+	real projectNormLength(realx3 p) const 
+	{
+		realx3 w = p - p1_;
+		return dot(w,v_) / (L_*L_);
+	}
+
+	INLINE_FUNCTION_HD
+	bool lineGrainCheck(
+		const realx3 pos,
+		real Rad,
+		realx3 &nv,
+		realx3 &cp,
+		real &ovrlp)const
+	{
+
+		
+		real t = projectNormLength(pos);
+
+		if(t >= 0.0 && t <= 1.0) 			 	 cp = point(t);
+		else if(t >= (-Rad / L_) && t < 0.0) 	 cp = point(0.0);
+		else if(t>1.0 && t >= (1.0 + Rad / L_)) cp = point(1.0);
+		else return false;
+		
+		realx3 vec = pos - cp; // from cp to pos
+
+		real dist = length(vec);
+		ovrlp = Rad - dist;
+
+		if (ovrlp >= 0.0)
+		{
+			if (dist > 0)
+				nv = vec / dist;
+			else
+				nv = v_;
+			return true;
+		}
+
+		return false;
+	}
+};
+
+} //pFlow::grnTriInteractio
+
+#endif 
--- a/src/Interaction/grainInteraction/grainInteraction/triWall.hpp
+++ b/src/Interaction/grainInteraction/grainInteraction/triWall.hpp
@ -0,0 +1,108 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __triWall_hpp__
+#define __triWall_hpp__
+
+#include "types.hpp"
+
+namespace pFlow::grnTriInteraction
+{
+
+struct triWall
+{
+	
+	realx3 n_;
+	real   offset_;
+
+	INLINE_FUNCTION_H
+	triWall(const realx3& p1, const realx3& p2, const realx3& p3)
+	{
+		if(!makeWall(p1,p2,p3, n_, offset_))
+		{
+			fatalErrorInFunction<<
+			"bad input for the wall.\n";
+			fatalExit;
+		}
+	}
+
+	INLINE_FUNCTION_HD
+	triWall(bool, const realx3& p1, const realx3& p2, const realx3& p3)
+	{
+		makeWall(p1,p2,p3,n_,offset_);
+	}
+
+	INLINE_FUNCTION_HD
+	triWall(const realx3x3& tri)
+	{
+		makeWall(tri.x_, tri.y_, tri.z_, n_, offset_);
+	}
+
+	INLINE_FUNCTION_HD
+	triWall(const triWall&) = default;
+
+	INLINE_FUNCTION_HD
+	triWall& operator=(const triWall&) = default;
+
+	INLINE_FUNCTION_HD
+	triWall(triWall&&) = default;
+
+	INLINE_FUNCTION_HD
+	triWall& operator=(triWall&&) = default;
+
+	INLINE_FUNCTION_HD
+	~triWall()=default;
+
+	
+	INLINE_FUNCTION_HD 
+	real normalDistFromWall(const realx3 &p) const
+	{
+		return dot(n_, p) + offset_;
+	}
+
+	INLINE_FUNCTION_HD
+	realx3 nearestPointOnWall(const realx3 &p) const
+	{
+		real t = -(dot(n_, p) + offset_);
+		return realx3(n_.x_*t + p.x_, n_.y_*t + p.y_, n_.z_*t + p.z_);
+	}
+
+	INLINE_FUNCTION_HD static 
+	bool makeWall(
+		const realx3& p1,
+		const realx3& p2,
+		const realx3& p3,
+		realx3& n, real& offset)
+	{
+		n = cross(p2 - p1, p3 - p1);
+		real len = length(n);
+	
+		if (len < 0.00000000001) return false;
+		n /= len;
+		offset = -dot(n, p1);
+		return true;
+	}
+
+
+}; 
+
+}
+
+#endif
--- a/src/Interaction/grainInteraction/grainInteractionsLinearModels.cpp
+++ b/src/Interaction/grainInteraction/grainInteractionsLinearModels.cpp
@ -0,0 +1,68 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#include "grainInteraction.hpp"
+#include "geometryMotions.hpp"
+#include "grainContactForceModels.hpp"
+#include "unsortedContactList.hpp"
+#include "sortedContactList.hpp"
+#include "createBoundaryGrainInteraction.hpp"
+
+
+
+#define createInteraction(ForceModel,GeomModel) 	\
+													\
+	template class pFlow::grainInteraction< 		\
+		ForceModel,									\
+		GeomModel,									\
+		pFlow::unsortedContactList>;				\
+													\
+	template class pFlow::grainInteraction< 		\
+		ForceModel,									\
+		GeomModel,									\
+		pFlow::sortedContactList>;					\
+	createBoundaryGrainInteraction(ForceModel, GeomModel)
+
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<true>>, pFlow::rotationAxisMotionGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<true>>, pFlow::rotationAxisMotionGeometry);
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<false>>, pFlow::rotationAxisMotionGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<false>>, pFlow::rotationAxisMotionGeometry);
+
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<true>>, pFlow::stationaryGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<true>>, pFlow::stationaryGeometry);
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<false>>, pFlow::stationaryGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<false>>, pFlow::stationaryGeometry);
+
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<true>>, pFlow::vibratingMotionGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<true>>, pFlow::vibratingMotionGeometry);
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<false>>, pFlow::vibratingMotionGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<false>>, pFlow::vibratingMotionGeometry);
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<true>>, pFlow::conveyorBeltMotionGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<true>>, pFlow::conveyorBeltMotionGeometry);
+
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGAbsoluteLinear<false>>, pFlow::conveyorBeltMotionGeometry);
+createInteraction(pFlow::cfModels::grainRolling<pFlow::cfModels::cGRelativeLinear<false>>, pFlow::conveyorBeltMotionGeometry);
--- a/src/Interaction/grainInteraction/grainInteractionsNonLinearModModels.cpp
+++ b/src/Interaction/grainInteraction/grainInteractionsNonLinearModModels.cpp
@ -0,0 +1,43 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#include "grainInteraction.hpp"
+#include "geometryMotions.hpp"
+#include "grainContactForceModels.hpp"
+#include "unsortedContactList.hpp"
+#include "sortedContactList.hpp"
+#include "createBoundaryGrainInteraction.hpp"
+
+
+
+#define createInteraction(ForceModel,GeomModel) 	\
+													\
+	template class pFlow::grainInteraction< 		\
+		ForceModel,									\
+		GeomModel,									\
+		pFlow::unsortedContactList>;				\
+													\
+	template class pFlow::grainInteraction< 		\
+		ForceModel,									\
+		GeomModel,									\
+		pFlow::sortedContactList>;					\
+	createBoundaryGrainInteraction(ForceModel, GeomModel)
+
+
--- a/src/Interaction/grainInteraction/grainInteractionsNonLinearModels.cpp
+++ b/src/Interaction/grainInteraction/grainInteractionsNonLinearModels.cpp
@ -0,0 +1,49 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow       
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------  
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating 
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions. 
+ 
+  phasicFlow is distributed to help others in their research in the field of 
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#include "grainInteraction.hpp"
+#include "geometryMotions.hpp"
+#include "grainContactForceModels.hpp"
+#include "unsortedContactList.hpp"
+#include "sortedContactList.hpp"
+#include "createBoundaryGrainInteraction.hpp"
+
+
+
+#define createInteraction(ForceModel,GeomModel) 	\
+													\
+	template class pFlow::grainInteraction< 		\
+		ForceModel,									\
+		GeomModel,									\
+		pFlow::unsortedContactList>;				\
+													\
+	template class pFlow::grainInteraction< 		\
+		ForceModel,									\
+		GeomModel,									\
+		pFlow::sortedContactList>;					\
+	createBoundaryGrainInteraction(ForceModel, GeomModel)
+
+
+createInteraction(pFlow::cfModels::limitedCGNonLinearGrainRolling, pFlow::rotationAxisMotionGeometry);
+
+createInteraction(pFlow::cfModels::nonLimitedCGNonLinearGrainRolling, pFlow::rotationAxisMotionGeometry);
+
+createInteraction(pFlow::cfModels::limitedCGNonLinearGrainRolling, pFlow::stationaryGeometry);
+createInteraction(pFlow::cfModels::nonLimitedCGNonLinearGrainRolling, pFlow::stationaryGeometry);
--- a/src/Interaction/interaction/interaction.hpp
+++ b/src/Interaction/interaction/interaction.hpp
@ -51,7 +51,7 @@ private:
 	const geometry& 	geometry_;

 	static inline
-	const message msg_ = message::ITEM_REARRANGE;
+	const message msg_ = message::ITEMS_REARRANGE;

 public:

--- a/src/Interaction/sphereInteraction/boundaries/boundarySphereInteraction/boundarySphereInteraction.hpp
+++ b/src/Interaction/sphereInteraction/boundaries/boundarySphereInteraction/boundarySphereInteraction.hpp
@ -110,7 +110,7 @@ public:
 		return geometryMotion_;
 	}

-	ContactListType& ppPairs()
+	ContactListType& ppPairs() 
 	{
 		return ppPairs_();
 	}
@ -148,7 +148,7 @@ public:
 		const ContactForceModel& cfModel,
 		uint32 step)
 	{
-		// for default boundary, no thing to be done 
+		// for default boundary, nothing to be done 
 		return false;
 	}

@ -156,20 +156,26 @@ public:

 	bool hearChanges
 	(
-		real t,
-		real dt,
-		uint32 iter,
+		const timeInfo& ti,
 		const message& msg, 
    	const anyList& varList
 	) override
    {
-		
+		if(msg.equivalentTo(message::BNDR_RESET))
+		{
+			// do nothing 
+			return true;
+		}
 		pOutput<<"Function (hearChanges in boundarySphereInteractions)is not implmented Message "<<
-		 msg <<endl<<" name "<< this->name() <<" type "<< this->type()<<endl;;
-		//notImplementedFunction;
+		 msg <<endl<<" name "<< this->boundaryName() <<" type "<< this->type()<<endl;
 		return true;
 	}

+	bool isActive()const override
+	{
+		return false;
+	}
+
 	static
 	uniquePtr<BoundarySphereInteractionType> create(
 		const boundaryBase& boundary,
--- a/src/Interaction/sphereInteraction/boundaries/boundarySphereInteractionList.cpp
+++ b/src/Interaction/sphereInteraction/boundaries/boundarySphereInteractionList.cpp
@ -7,11 +7,11 @@ pFlow::boundarySphereInteractionList<CFModel, gMModel>::boundarySphereInteractio
    const gMModel &geomMotion
 )
 :
-	ListPtr<boundarySphereInteraction<CFModel,gMModel>>(6),
+	boundaryListPtr<boundarySphereInteraction<CFModel,gMModel>>(),
 	boundaries_(sphPrtcls.pStruct().boundaries())
 {
-	//gSettings::sleepMiliSeconds(1000*pFlowProcessors().localRank());
-	for(uint32 i=0; i<6; i++)
+	output<<boundaries_.size()<<endl;
+	ForAllBoundariesPtr(i, this)
 	{
 		this->set(
 			i,
--- a/src/Interaction/sphereInteraction/boundaries/boundarySphereInteractionList.hpp
+++ b/src/Interaction/sphereInteraction/boundaries/boundarySphereInteractionList.hpp
@ -3,7 +3,7 @@


 #include "boundaryList.hpp"
-#include "ListPtr.hpp"
+#include "boundaryListPtr.hpp"
 #include "boundarySphereInteraction.hpp"


@ -14,7 +14,7 @@ namespace pFlow
 template<typename contactForceModel,typename geometryMotionModel>
 class boundarySphereInteractionList
 :
-    public ListPtr<boundarySphereInteraction<contactForceModel,geometryMotionModel>>
+    public boundaryListPtr<boundarySphereInteraction<contactForceModel,geometryMotionModel>>
 {
 private:

--- a/src/Interaction/sphereInteraction/boundaries/periodicBoundarySphereInteraction/periodicBoundarySphereInteraction.hpp
+++ b/src/Interaction/sphereInteraction/boundaries/periodicBoundarySphereInteraction/periodicBoundarySphereInteraction.hpp
@ -76,15 +76,17 @@ public:
        boundaryBase
    );
    
-    ~periodicBoundarySphereInteraction()override = default;
-
-
-    
+    ~periodicBoundarySphereInteraction()override = default;  

    bool sphereSphereInteraction(
        real dt,
 		const ContactForceModel& cfModel,
        uint32 step)override;
+    
+    bool isActive()const override
+	{
+		return true;
+	}
 	
 };

--- a/src/Interaction/sphereInteraction/sphereInteraction/sphereInteraction.cpp
+++ b/src/Interaction/sphereInteraction/sphereInteraction/sphereInteraction.cpp
@ -41,9 +41,9 @@ bool pFlow::sphereInteraction<cFM,gMM, cLT>::createSphereInteraction()
 	geometryMotion_,
 	timers());

-	ppContactList_ = makeUnique<ContactListType>(nPrtcl+1);
+	ppContactList_ = makeUnique<ContactListType>("sphere-sphere",nPrtcl+1);
 	
-	pwContactList_ = makeUnique<ContactListType>(nPrtcl/5+1);
+	pwContactList_ = makeUnique<ContactListType>("sphere-wall",nPrtcl/5+1);

 	return true;
 }
@ -134,18 +134,22 @@ pFlow::sphereInteraction<cFM,gMM, cLT>::sphereInteraction
 	geometryMotion_(dynamic_cast<const GeometryMotionModel&>(geom)),
 	sphParticles_(dynamic_cast<const sphereParticles&>(prtcl)),
 	boundaryInteraction_(sphParticles_,geometryMotion_),
-	ppInteractionTimer_("sphere-sphere interaction", &this->timers()),
-	pwInteractionTimer_("sphere-wall interaction", &this->timers()),
-	contactListMangementTimer_("contact-list management", &this->timers()),
-	boundaryContactSearchTimer_("contact search for boundary", &this->timers()),
-	boundaryInteractionTimer_("interaction for boundary", &this->timers()),
-	contactListBoundaryTimer_("contact-list management for boundary", &this->timers())
+	ppInteractionTimer_("sphere-sphere interaction (internal)", &this->timers()),
+	pwInteractionTimer_("sphere-wall interaction (internal)", &this->timers()),
+	boundaryInteractionTimer_("sphere-sphere interaction (boundary)",&this->timers()),
+	contactListMangementTimer_("list management (interal)", &this->timers()),
+	contactListMangementBoundaryTimer_("list management (boundary)", &this->timers())
 {
 	
 	if(!createSphereInteraction())
 	{
 		fatalExit;
 	}
+
+	for(uint32 i=0; i<6; i++)
+	{
+		activeBoundaries_[i] = boundaryInteraction_[i].ppPairsAllocated();
+	}
 }

 template<typename cFM,typename gMM,template <class, class, class> class cLT>
@ -158,45 +162,58 @@ template<typename cFM,typename gMM,template <class, class, class> class cLT>
 bool pFlow::sphereInteraction<cFM,gMM, cLT>::iterate()
 {
 	
-	auto iter = this->currentIter();
-	auto t = this->currentTime();
-	auto dt = this->dt();
+	timeInfo ti = this->TimeInfo();
+	auto iter = ti.iter();
+	auto t = ti.t();
+	auto dt = ti.dt();

-	
-	bool broadSearch = contactSearch_().enterBroadSearch(iter, t, dt);
+	auto& contactSearchRef = contactSearch_();

+	bool broadSearch = contactSearchRef.enterBroadSearch(ti);
+	bool broadSearchBoundary = contactSearchRef.enterBroadSearchBoundary(ti);
+
+	/// update boundaries of the fields that are being used by inreaction 
 	sphParticles_.diameter().updateBoundaries(DataDirection::SlaveToMaster);
 	sphParticles_.velocity().updateBoundaries(DataDirection::SlaveToMaster);
 	sphParticles_.rVelocity().updateBoundaries(DataDirection::SlaveToMaster);
-	sphParticles_.mass().updateBoundaries(DataDirection::SlaveToMaster);
-	sphParticles_.I().updateBoundaries(DataDirection::SlaveToMaster);
 	sphParticles_.propertyId().updateBoundaries(DataDirection::SlaveToMaster);
 	
-	
+	/// lists 
 	if(broadSearch)
 	{
 		contactListMangementTimer_.start();
-		ppContactList_().beforeBroadSearch();
-		pwContactList_().beforeBroadSearch();
+		ComputationTimer().start();
+			ppContactList_().beforeBroadSearch();
+			pwContactList_().beforeBroadSearch();
+		ComputationTimer().end();
 		contactListMangementTimer_.pause();
 	} 

-	contactListBoundaryTimer_.start();
-	for(uint32 i=0; i<6u; i++)
+	if(broadSearchBoundary)
 	{
-		auto& BI = boundaryInteraction_[i];
-		if(BI.ppPairsAllocated()) BI.ppPairs().beforeBroadSearch();
-		if(BI.pwPairsAllocated()) BI.pwPairs().beforeBroadSearch();
+		contactListMangementBoundaryTimer_.start();
+		ComputationTimer().start();
+
+		ForAllActiveBoundaries(i, boundaryInteraction_)
+		//for(size_t i=0; i<6; i++)
+		{
+			if(activeBoundaries_[i])
+			{
+				auto& BI = boundaryInteraction_[i];
+				BI.ppPairs().beforeBroadSearch();
+				BI.pwPairs().beforeBroadSearch();
+			}
+		}
+
+		ComputationTimer().end();
+		contactListMangementBoundaryTimer_.pause();	
 	}
-	contactListBoundaryTimer_.pause();
 	
 	if( sphParticles_.numActive()<=0)return true;
 	
-	
-	if( !contactSearch_().broadSearch(
-			iter,
-			t,
-			dt,		
+	ComputationTimer().start();
+	if( !contactSearchRef.broadSearch(
+			ti,		
 			ppContactList_(),
 			pwContactList_()) )
 	{
@ -205,62 +222,69 @@ bool pFlow::sphereInteraction<cFM,gMM, cLT>::iterate()
 		fatalExit;
 	}
 	
-	boundaryContactSearchTimer_.start();
-	for(uint32 i=0; i<6u; i++)
+	ForAllActiveBoundaries(i, boundaryInteraction_)
+	//for(size_t i=0; i<6; i++)
 	{
-		auto& BI =boundaryInteraction_[i];
-		if(BI.ppPairsAllocated())
+		if(activeBoundaries_[i])
 		{
-			if( !contactSearch_().boundaryBroadSearch(
+			auto& BI = boundaryInteraction_[i];
+			if(!contactSearchRef.boundaryBroadSearch(
 				i,
-				iter,
-				t,
-				dt,
+				ti,
 				BI.ppPairs(),
-				BI.pwPairs()))
+				BI.pwPairs())
+			)
 			{
 				fatalErrorInFunction<<
 				"failed to perform broadSearch for boundary index "<<i<<endl;
 				return false;
 			}
-		} 
+		}
 	}
-	boundaryContactSearchTimer_.end();
+	ComputationTimer().end();
 	
-	if(broadSearch && contactSearch_().performedBroadSearch())
+	if(broadSearch && contactSearchRef.performedSearch())
 	{
 		contactListMangementTimer_.resume();
-		ppContactList_().afterBroadSearch();
-		pwContactList_().afterBroadSearch();
+		ComputationTimer().start();
+			ppContactList_().afterBroadSearch();
+			pwContactList_().afterBroadSearch();
+		ComputationTimer().end();
 		contactListMangementTimer_.end();
 	}

-	contactListBoundaryTimer_.resume();
-	for(uint32 i=0; i<6u; i++)
+	if(broadSearchBoundary && contactSearchRef.performedSearchBoundary())
 	{
-		auto& BI = boundaryInteraction_[i];
-		if(BI.ppPairsAllocated()) BI.ppPairs().afterBroadSearch();
-		if(BI.pwPairsAllocated()) BI.pwPairs().afterBroadSearch();
-	}
-	contactListBoundaryTimer_.end();
-	
-	
-	{
-	boundaryInteractionTimer_.start();
-	std::array<bool,6> requireStep{
-		boundaryInteraction_[0].isBoundaryMaster(),
-		boundaryInteraction_[1].isBoundaryMaster(),
-		boundaryInteraction_[2].isBoundaryMaster(),
-		boundaryInteraction_[3].isBoundaryMaster(),
-		boundaryInteraction_[4].isBoundaryMaster(),
-		boundaryInteraction_[5].isBoundaryMaster()};
-	int step = 1;
-	const auto& cfModel = this->forceModel_();
-	while( std::any_of(requireStep.begin(), requireStep.end(), [](bool v) { return v==true; }))
-	{
-		for(uint32 i=0; i<6u; i++)
+		contactListMangementBoundaryTimer_.resume();
+		ComputationTimer().start();
+		
+		ForAllActiveBoundaries(i, boundaryInteraction_)
+		//for(size_t i=0; i<6; i++)
 		{
-			if(step==1u || requireStep[i] )
+			if(activeBoundaries_[i])
+			{
+				auto& BI = boundaryInteraction_[i];
+				BI.ppPairs().afterBroadSearch();
+				BI.pwPairs().afterBroadSearch();
+			}
+		}
+
+		ComputationTimer().end();
+		contactListMangementBoundaryTimer_.end();
+	}
+	
+	/// peform contact search on boundareis with active contact search (master boundaries)
+	auto requireStep = boundariesMask<6>(true);
+	const auto& cfModel = this->forceModel_();
+	uint32 step=1;
+	boundaryInteractionTimer_.start();
+	ComputationTimer().start();
+	while(requireStep.anyElement(true) && step <= 10)
+	{
+		ForAllBoundaries(i, boundaryInteraction_)
+		//for(size_t i=0; i<6; i++)
+		{
+			if(requireStep[i] )
 			{
 				requireStep[i] = boundaryInteraction_[i].sphereSphereInteraction(
 					dt, 
@ -271,44 +295,47 @@ bool pFlow::sphereInteraction<cFM,gMM, cLT>::iterate()
 		}
 		step++;
 	}
+	ComputationTimer().end();
 	boundaryInteractionTimer_.pause();
-	}
+	
+
 	ppInteractionTimer_.start();
+	ComputationTimer().start();
 		sphereSphereInteraction();
+	ComputationTimer().end();
 	ppInteractionTimer_.end();

 	
 	pwInteractionTimer_.start();
+	ComputationTimer().start();
 		sphereWallInteraction();
+	ComputationTimer().start();
 	pwInteractionTimer_.end();

 	{
 	boundaryInteractionTimer_.resume();
-	std::array<bool,6> requireStep{
-		!boundaryInteraction_[0].isBoundaryMaster(),
-		!boundaryInteraction_[1].isBoundaryMaster(),
-		!boundaryInteraction_[2].isBoundaryMaster(),
-		!boundaryInteraction_[3].isBoundaryMaster(),
-		!boundaryInteraction_[4].isBoundaryMaster(),
-		!boundaryInteraction_[5].isBoundaryMaster()};
+	ComputationTimer().start();
+	auto requireStep = boundariesMask<6>(true);

-	int step = 2;
+	uint32 step = 11;
 	const auto& cfModel = this->forceModel_();
-	while(std::any_of(requireStep.begin(), requireStep.end(), [](bool v) { return v==true; }))
+	while( requireStep.anyElement(true) && step < 20 )
 	{
-		for(uint32 i=0; i<6u; i++)
+		ForAllBoundaries(i, boundaryInteraction_)
+		//for(size_t i=0; i<6; i++)
 		{
 			if(requireStep[i])
 			{
 				requireStep[i] = boundaryInteraction_[i].sphereSphereInteraction(
 					dt, 
-					this->forceModel_(),
+					cfModel,
 					step
 				);
 			}		
 		}
 		step++;
 	}
+	ComputationTimer().end();
 	boundaryInteractionTimer_.end();
 	}
 	
@ -324,17 +351,18 @@ bool pFlow::sphereInteraction<cFM,gMM, cLT>::afterIteration()
 template<typename cFM,typename gMM,template <class, class, class> class cLT>
 bool pFlow::sphereInteraction<cFM,gMM, cLT>::hearChanges
 (
-	real t,
-	real dt,
-	uint32 iter,
+	const timeInfo& ti,
 	const message& msg, 
 	const anyList& varList
 )
 {
-	if(msg.equivalentTo(message::ITEM_REARRANGE))
+	if(msg.equivalentTo(message::ITEMS_REARRANGE))
 	{
 		notImplementedFunction;
+		return false;
 	}
-	return true;
-}
-
+	
+	fatalErrorInFunction<<"Event "<< msg.eventNames()<<
+	" is not handled in sphereInteraction"<<endl;
+	return false;
+}
--- a/src/Interaction/sphereInteraction/sphereInteraction/sphereInteraction.hpp
+++ b/src/Interaction/sphereInteraction/sphereInteraction/sphereInteraction.hpp
@ -25,6 +25,8 @@ Licence:
 #include "sphereParticles.hpp"
 #include "boundarySphereInteractionList.hpp"
 #include "sphereInteractionKernels.hpp"
+#include "boundariesMask.hpp"
+#include "MPITimer.hpp"
 //#include "unsortedContactList.hpp"


@ -74,6 +76,9 @@ private:
 	/// particle-particle and particle-wall interactions at boundaries 
 	BoundaryListType 					boundaryInteraction_;	

+	/// a mask for active boundaries (boundaries with intreaction)
+	boundariesMask<6> 					activeBoundaries_;
+
 	/// contact search object for pp and pw interactions 
 	uniquePtr<contactSearch> 			contactSearch_ = nullptr;

@ -93,14 +98,13 @@ private:
 	/// timer for particle-wall interaction computations
 	Timer       pwInteractionTimer_;

-	/// timer for managing contact lists (only inernal points)
-	Timer 		contactListMangementTimer_;
-
-	Timer 		boundaryContactSearchTimer_;
 	/// timer for boundary interaction time 
 	Timer 		boundaryInteractionTimer_;

-	Timer 		contactListBoundaryTimer_;
+	/// timer for managing contact lists (only inernal points)
+	Timer 		contactListMangementTimer_;	
+
+	Timer 		contactListMangementBoundaryTimer_;

 	

@ -110,10 +114,6 @@ private:

 	bool sphereWallInteraction();

-	//bool managePPContactLists();
-
-	//bool managePWContactLists();
-
 	/// range policy for p-p interaction execution 
 	using rpPPInteraction = 
 		Kokkos::RangePolicy<Kokkos::IndexType<uint32>, Kokkos::Schedule<Kokkos::Dynamic>>;
@ -152,9 +152,7 @@ public:

 	/// Check for changes in the point structures. (overriden from observer)
 	bool hearChanges(
-		real t,
-		real dt,
-		uint32 iter,
+		const timeInfo& ti,
 		const message& msg, 
 		const anyList& varList)override;
 	
--- a/src/Interaction/sphereInteraction/sphereInteractionsLinearModels.cpp
+++ b/src/Interaction/sphereInteraction/sphereInteractionsLinearModels.cpp
@ -53,6 +53,10 @@ createInteraction(pFlow::cfModels::nonLimitedLinearNormalRolling,pFlow::rotation
 createInteraction(pFlow::cfModels::limitedLinearNormalRolling, pFlow::vibratingMotionGeometry);
 createInteraction(pFlow::cfModels::nonLimitedLinearNormalRolling,pFlow::vibratingMotionGeometry);

+// conveyorBeltGeometry
+createInteraction(pFlow::cfModels::limitedLinearNormalRolling, pFlow::conveyorBeltMotionGeometry);
+createInteraction(pFlow::cfModels::nonLimitedLinearNormalRolling,pFlow::conveyorBeltMotionGeometry);
+
 // multiRotationAxisMotionGeometry
 //createInteraction(pFlow::cfModels::limitedLinearNormalRolling, pFlow::multiRotationAxisMotionGeometry);
 //createInteraction(pFlow::cfModels::nonLimitedLinearNormalRolling,pFlow::multiRotationAxisMotionGeometry);
--- a/src/Interaction/sphereInteraction/sphereInteractionsNonLinearModModels.cpp
+++ b/src/Interaction/sphereInteraction/sphereInteractionsNonLinearModModels.cpp
@ -53,6 +53,10 @@ createInteraction(pFlow::cfModels::nonLimitedNonLinearModNormalRolling,pFlow::ro
 createInteraction(pFlow::cfModels::limitedNonLinearModNormalRolling, pFlow::vibratingMotionGeometry);
 createInteraction(pFlow::cfModels::nonLimitedNonLinearModNormalRolling,pFlow::vibratingMotionGeometry);

+// conveyorBeltMotionGeometry
+createInteraction(pFlow::cfModels::limitedNonLinearModNormalRolling, pFlow::conveyorBeltMotionGeometry);
+createInteraction(pFlow::cfModels::nonLimitedNonLinearModNormalRolling,pFlow::conveyorBeltMotionGeometry);
+
 // multiRotationAxisMotionGeometry
-//createInteraction(pFlow::cfModels::limitedNonLinearModNormalRolling, pFlow::multiRotationAxisMotionGeometry);
-//createInteraction(pFlow::cfModels::nonLimitedNonLinearModNormalRolling,pFlow::multiRotationAxisMotionGeometry);
+createInteraction(pFlow::cfModels::limitedNonLinearModNormalRolling, pFlow::multiRotationAxisMotionGeometry);
+createInteraction(pFlow::cfModels::nonLimitedNonLinearModNormalRolling,pFlow::multiRotationAxisMotionGeometry);
--- a/src/Interaction/sphereInteraction/sphereInteractionsNonLinearModels.cpp
+++ b/src/Interaction/sphereInteraction/sphereInteractionsNonLinearModels.cpp
@ -53,6 +53,10 @@ createInteraction(pFlow::cfModels::nonLimitedNonLinearNormalRolling,pFlow::rotat
 createInteraction(pFlow::cfModels::limitedNonLinearNormalRolling, pFlow::vibratingMotionGeometry);
 createInteraction(pFlow::cfModels::nonLimitedNonLinearNormalRolling,pFlow::vibratingMotionGeometry);

+// conveyorBeltMotionGeometry
+createInteraction(pFlow::cfModels::limitedNonLinearNormalRolling, pFlow::conveyorBeltMotionGeometry);
+createInteraction(pFlow::cfModels::nonLimitedNonLinearNormalRolling,pFlow::conveyorBeltMotionGeometry);
+
 // multiRotationAxisMotionGeometry
 //createInteraction(pFlow::cfModels::limitedNonLinearNormalRolling, pFlow::multiRotationAxisMotionGeometry);
 //createInteraction(pFlow::cfModels::nonLimitedNonLinearNormalRolling,pFlow::multiRotationAxisMotionGeometry);