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New tutorial on hemogenization silo is added

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16
tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/README.md Normal file
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# Simulating a simple homogenization silo using periodic boundary
## Problem
A homogenization silo is used to mix particles inside a silo using the circulation of particles. A pneumatic conveying system is used to carry particles at the exit and re-enter them from the top. Here, we use a `periodic` boundary to simulate the action of the pneumatic conveyor system for circulating particles. Particles that are exiting from the bottom are re-entered from top using this boundary (`periodic`).
<div align ="center">
<b>
A view of homogenization silo
</b>
<img src="./homoSilo.jpeg" style="width: 400px;">
</div>
***

67
tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/caseSetup/interaction Executable file
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/* -------------------------------*- C++ -*--------------------------------- *\
| phasicFlow File |
| copyright: www.cemf.ir |
\* ------------------------------------------------------------------------- */
objectName interaction;
objectType dicrionary;
fileFormat ASCII;
/*---------------------------------------------------------------------------*/
materials (lightMat heavyMat wallMat); // a list of materials names
densities (1000 1500.0 2500); // density of materials [kg/m3]
contactListType sortedContactList;
contactSearch
{
method NBS; // method for broad search particle-particle
updateInterval 10;
sizeRatio 1.1;
cellExtent 0.55;
adjustableBox No;
}
model
{
contactForceModel nonLinearLimited;
rollingFrictionModel normal;
/*
Property (lightMat-lightMat lightMat-heavyMat lightMat-wallMat
heavyMat-heavyMat heavyMat-wallMat
wallMat-wallMat );
*/
Yeff (1.0e6 1.0e6 1.0e6 // Young modulus [Pa]
1.0e6 1.0e6
1.0e6);
Geff (0.8e6 0.8e6 0.8e6 // Shear modulus [Pa]
0.8e6 0.8e6
0.8e6);
nu (0.25 0.25 0.25 // Poisson's ratio [-]
0.25 0.25
0.25);
en (0.97 0.97 0.85 // coefficient of normal restitution
0.97 0.85
1.00);
mu (0.65 0.65 0.35 // dynamic friction
0.65 0.35
0.35);
mur (0.1 0.1 0.1 // rolling friction
0.1 0.1
0.1);
}

214
tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/caseSetup/particleInsertion Executable file
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/* -------------------------------*- C++ -*--------------------------------- *\
| phasicFlow File |
| copyright: www.cemf.ir |
\* ------------------------------------------------------------------------- */
objectName particleInsertion;
objectType dicrionary;
fileFormat ASCII;
/*---------------------------------------------------------------------------*/
active Yes; // is insertion active -> yes or no
/*
one layers of particles are packed
*/
layer0
{
timeControl simulationTime;
regionType cylinder; // type of insertion region
rate 5100; // insertion rate (particles/s)
startTime 0; // (s)
endTime 0.5; // (s)
insertionInterval 0.025; // s
cylinderInfo
{
radius 0.09; // radius of cylinder (m)
p1 (0.0 0.0 0.1); // (m,m,m)
p2 (0.0 0.0 0.11); // (m,m,m)
}
setFields
{
velocity realx3 (0.0 0.0 -0.6); // initial velocity of inserted particles
}
mixture
{
parType1 1; // mixture composition of inserted particles
}
}
layer1
{
timeControl simulationTime;
regionType cylinder; // type of insertion region
rate 5100; // insertion rate (particles/s)
startTime 0.7; // (s)
endTime 1.2; // (s)
insertionInterval 0.025; // s
cylinderInfo
{
radius 0.09;
p1 (0.0 0.0 0.16 ); // (m,m,m)
p2 (0.0 0.0 0.17); // (m,m,m)
}
setFields
{
velocity realx3 (0.0 0.0 -0.6);
}
mixture
{
parType2 1; // only parType2
}
}
layer2
{
timeControl simulationTime;
regionType cylinder; // type of insertion region
rate 5100; // insertion rate (particles/s)
startTime 1.4; // (s)
endTime 1.9; // (s)
insertionInterval 0.025; // s
cylinderInfo
{
radius 0.09;
p1 ( 0.0 0.0 0.2 ); // (m,m,m)
p2 ( 0.0 0.0 0.21); // (m,m,m)
}
setFields
{
velocity realx3 (0.0 0.0 -0.6);
}
mixture
{
lightSphere 1; // only lightSphere
}
}
layer3
{
timeControl simulationTime;
regionType cylinder; // type of insertion region
rate 5100; // insertion rate (particles/s)
startTime 2.1; // (s)
endTime 2.6; // (s)
insertionInterval 0.025; // s
cylinderInfo
{
radius 0.09;
p1 ( 0.0 0.0 0.28 ); // (m,m,m)
p2 ( 0.0 0.0 0.29); // (m,m,m)
}
setFields
{
velocity realx3 (0.0 0.0 -0.6);
}
mixture
{
heavySphere 1;
}
}
layer4
{
timeControl simulationTime;
regionType cylinder; // type of insertion region
rate 5100; // insertion rate (particles/s)
startTime 2.8; // (s)
endTime 3.3; // (s)
insertionInterval 0.025; // s
cylinderInfo
{
radius 0.09;
p1 ( 0.0 0.0 0.37 ); // (m,m,m)
p2 ( 0.0 0.0 0.38); // (m,m,m)
}
setFields
{
velocity realx3 (0.0 0.0 -0.6);
}
mixture
{
lightSphere 1;
}
}
layer5
{
timeControl simulationTime;
regionType cylinder; // type of insertion region
rate 5100; // insertion rate (particles/s)
startTime 3.4; // (s)
endTime 3.9; // (s)
insertionInterval 0.025; // s
cylinderInfo
{
radius 0.09;
p1 ( 0.0 0.0 0.38 ); // (m,m,m)
p2 ( 0.0 0.0 0.39); // (m,m,m)
}
setFields
{
velocity realx3 (0.0 0.0 -0.6);
}
mixture
{
heavySphere 1;
}
}

15
tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/caseSetup/shapes Executable file
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/* -------------------------------*- C++ -*--------------------------------- *\
| phasicFlow File |
| copyright: www.cemf.ir |
\* ------------------------------------------------------------------------- */
objectName sphereDict;
objectType sphereShape;
fileFormat ASCII;
/*---------------------------------------------------------------------------*/
names (parType1 parType2); // names of shapes
diameters (0.00885 0.0089); // diameter of shapes
materials (lightMat heavyMat); // material names for shapes

7
tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/cleanThisCase Executable file
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#!/bin/sh
cd ${0%/*} || exit 1 # Run from this directory
ls | grep -P "^(([0-9]+\.?[0-9]*)|(\.[0-9]+))$" | xargs -d"\n" rm -rf
rm -rf VTK
#------------------------------------------------------------------------------

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tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/homoSilo.jpeg Normal file
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tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/runThisCase Executable file
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#!/bin/sh
cd ${0%/*} || exit 1 # Run from this directory
echo "\n<--------------------------------------------------------------------->"
echo "1) Creating particles"
echo "<--------------------------------------------------------------------->\n"
particlesPhasicFlow
echo "\n<--------------------------------------------------------------------->"
echo "2) Creating geometry"
echo "<--------------------------------------------------------------------->\n"
geometryPhasicFlow
echo "\n<--------------------------------------------------------------------->"
echo "3) Running the case"
echo "<--------------------------------------------------------------------->\n"
sphereGranFlow
echo "\n<--------------------------------------------------------------------->"
echo "4) Converting to vtk"
echo "<--------------------------------------------------------------------->\n"
pFlowToVTK --fields diameter velocity id --binary
#------------------------------------------------------------------------------

52
tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/settings/domainDict Executable file
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/* -------------------------------*- C++ -*--------------------------------- *\
| phasicFlow File |
| copyright: www.cemf.ir |
\* ------------------------------------------------------------------------- */
objectName domainDict;
objectType dictionary;
fileFormat ASCII;
/*---------------------------------------------------------------------------*/
// Simulation domain: every particles that goes outside this domain will be deleted
globalBox
{
min (-0.11 -0.11 -0.15);
max ( 0.11 0.11 0.4);
}
boundaries
{
left
{
type exit;
}
right
{
type exit;
}
bottom
{
type exit;
}
top
{
type exit;
}
rear
{
type periodic;
}
front
{
type periodic;
}
}

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tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/settings/geometryDict Executable file
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/* -------------------------------*- C++ -*--------------------------------- *\
| phasicFlow File |
| copyright: www.cemf.ir |
\* ------------------------------------------------------------------------- */
objectName geometryDict;
objectType dictionary;
fileFormat ASCII;
/*---------------------------------------------------------------------------*/
motionModel rotatingAxis;
rotatingAxisInfo
{
// for opening the gate of silo between time 4.1 and 5.1 s
gateMotion
{
p1 (-0.04 -0.04 -0.1);
p2 (-0.04 -0.04 0.0);
omega 3.14;
startTime 4.1;
endTime 5.1;
}
}
surfaces
{
cylinderShell
{
type cylinderWall; // other options: cuboidWall and planeWall
p1 (0.0 0.0 0.0); // begin point of cylinder axis
p2 (0.0 0.0 0.4); // end point of cylinder axis
radius1 0.1; // radius at p1
radius2 0.1; // radius at p2
resolution 36; // number of divisions
material wallMat; // material name of this wall
}
coneShell
{
type cylinderWall; // other options: cuboidWall and planeWall
p1 (0.0 0.0 -0.1); // begin point of cylinder axis
p2 (0.0 0.0 0.0); // end point of cylinder axis
radius1 0.04; // radius at p1
radius2 0.1; // radius at p2
resolution 36; // number of divisions
material wallMat; // material name of this wall
}
/*
This is a plane wall at the exit of silo
*/
exitGate
{
type planeWall; // other options: cuboidWall and cylinderWall
p1 (-0.04 -0.04 -0.1); // first point of the wall
p2 ( 0.04 -0.04 -0.1); // second point of the wall
p3 ( 0.04 0.04 -0.1); // third point of the wall
p4 (-0.04 0.04 -0.1); // fourth point of the wall
material wallMat; // material name of the wall
motion gateMotion;
}
}

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tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/settings/particlesDict Executable file
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/* -------------------------------*- C++ -*--------------------------------- *\
| phasicFlow File |
| copyright: www.cemf.ir |
\* ------------------------------------------------------------------------- */
objectName particlesDict;
objectType dictionary;
fileFormat ASCII;
/*---------------------------------------------------------------------------*/
setFields
{
/*
Default value for fields defined for particles
These fields should always be defined for simulations with
spherical particles.
*/
defaultValue
{
velocity realx3 (0 0 0); // linear velocity (m/s)
acceleration realx3 (0 0 0); // linear acceleration (m/s2)
rVelocity realx3 (0 0 0); // rotational velocity (rad/s)
shapeName word parType1; // name of the particle shape
}
selectors
{}
}
positionParticles
{
method empty; // empty simulation
}

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tutorials/sphereGranFlow/homogenizationSilo-PeriodicBoundary/settings/settingsDict Executable file
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/* -------------------------------*- C++ -*--------------------------------- *\
| phasicFlow File |
| copyright: www.cemf.ir |
\* ------------------------------------------------------------------------- */
objectName settingsDict;
objectType dictionary;
fileFormat ASCII;
/*---------------------------------------------------------------------------*/
run homogenizationSilo;
dt 0.00001; // time step for integration (s)
startTime 0.0; // start time for simulation
endTime 20; // end time for simulation
saveInterval 0.05; // time interval for saving the simulation
timePrecision 4; // maximum number of digits for time folder
g (0 0 -9.8); // gravity vector (m/s2)
// overrides the default behavior
includeObjects (diameter);
// exclude unnecessary data from saving on disk
excludeObjects (rVelocity.dy1 rVelocity.dy2 rVelocity.dy3
pStructPosition.dy1 pStructPosition.dy2 pStructPosition.dy3
pStructVelocity.dy1 pStructVelocity.dy2 pStructVelocity.dy3);
integrationMethod AdamsBashforth4; // integration method
writeFormat binary; // data writting format (ascii or binary)
timersReport Yes; // report timers
timersReportInterval 0.1; // time interval for reporting timers