Merge pull request #185 from ramin1728/RotatingDrumWithBaffles
Rotating drum with baffles
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PhasicFlow
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# Problem Definition
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The problem is to simulate a rotating drum with the diameter **0.24 m**, the length **0.1 m** and **6** Baffles, rotating at **15 rpm**. This drum is filled with **20000** Particles.The timestep for integration is **0.00001 s**. There are 2 types of Particles in this drum each are being inserted during simulation to fill the drum.
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# Problem Definition (v-1.0)
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The problem is to simulate a rotating drum with a diameter of 0.24 m, a length of 0.1 m and 6 baffles rotating at 15 rpm. This drum is filled with 20000 particles, the integration time step is 0.00001 s. There are 2 types of particles in this drum, each of which is inserted during the simulation to fill the drum.
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* **12500** Particles with **4 mm** diameter, at the rate of 12500 particles/s for 1 sec.
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* **7500** Particles with **5mm** diameter, at the rate of 7500 particles/s for 1 sec.
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@ -15,10 +15,10 @@ The problem is to simulate a rotating drum with the diameter **0.24 m**, the len
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</html>
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# Setting up the Case
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As it has been explained in the previous cases, the simulation case setup is based on text-based scripts. Here, the simulation case setup are sotred in three folders: `caseSetup`, `setting` and `stl` (see the above folders).
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As it has been explained in the previous cases, the simulation case setup is based on text-based scripts. Here, the simulation case setup are sorted in three folders: `caseSetup`, `setting` and `stl`.
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## Defining small and large particles
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Then in the `caseSetup/sphereShape` the diameter and the material name of the particles are defined. Two sizes are defined: 4 and 5 mm.
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Then in the `caseSetup/shapes` the diameter and the material name of the particles are defined. Two sizes are defined: 4 and 5 mm.
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```C++
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// names of shapes
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names (smallSphere largeSphere);
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@ -30,7 +30,7 @@ materials (lightMat heavyMat);
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## Particle Insertion
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In this case we have two region for inserting our particles. In the both region we define rate of insertion, start and end time of insertion, information for the volume of the space throught which particles are being inserted. The insertion phase in the simulation is performed between times 0 and 1 seconds.
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In this case we have two regions for inserting the particles. In both regions we define the insertion rate, the start and end time of the insertion, information about the volume of space through which the particles are inserted. The insertion phase in the simulation is performed between times 0 and 1 second.
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For example, for the insertion region for inserting light particles is shown below.
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<div align="center">
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@ -43,7 +43,8 @@ in <b>caseSetup/particleInsertion</b> file
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layerrightregion
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{
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// type of insertion region
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type cylinderRegion;
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timeControl simulationTime;
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regionType cylinder;
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// insertion rate (particles/s)
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rate 12500;
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// Start time of LightParticles insertion (s)
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@ -51,9 +52,9 @@ layerrightregion
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// End time of LightParticles insertion (s)
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endTime 1;
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// Time Interval of LightParticles insertion (s)
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interval 0.025;
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insertionInterval 0.025;
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cylinderRegionInfo
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cylinderInfo
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{
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// Coordinates of cylinderRegion (m,m,m)
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p2 (-0.15 0.25 0.05);
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@ -64,7 +65,7 @@ layerrightregion
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}
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```
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## Interaction between particles and walls
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In `caseSetup/interaction` file, material names and properties and interaction parameters are defined: interaction between the particles and the shell of rotating drum. Since we are defining 3 materials for simulation, the interaction matrix is 3x3, while we are only required to enter upper-triangle elements (interactions are symetric).
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The `caseSetup/interaction` file defines the material names and properties as well as the interaction parameters: the interaction between the particles and the shell of the rotating drum. Since we define 3 materials for simulation, the interaction matrix is 3x3, while we only need to enter upper triangle elements (interactions are symmetric).
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```C++
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// a list of materials names
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@ -93,10 +94,6 @@ densities (1000 1500 2500);
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en (0.97 0.97 0.85
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0.97 0.85
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1.00);
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// coefficient of tangential restitution
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et (1.0 1.0 1.0
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1.0 1.0
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1.0);
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// dynamic friction
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mu (0.65 0.65 0.35
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0.65 0.35
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@ -166,7 +163,8 @@ surfaces
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In this part of `geometryDict` the information of rotating axis and speed of rotation are defined. The start of rotation is at 2 s. The first 2 seconds of simulation is for allowing particles to settle donw in the drum.
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```C++
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rotatingAxisMotionInfo
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motionModel rotatingAxis;
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rotatingAxisInfo
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{
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rotAxis
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{
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@ -184,9 +182,9 @@ rotatingAxisMotionInfo
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}
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```
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## Performing Simulation
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To perform simulations, enter the following commands one after another in the terminal.
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To run simulations, type the following commands in the terminal one at a time.
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Enter `$ particlesPhasicFlow` command to create the initial fields for particles.
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Enter `$ geometryPhasicFlow` command to create the Geometry.
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At last, enter `$ sphereGranFlow` command to start the simulation.
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After finishing the simulation, you can use `$ pFlowtoVTK` to convert the results into vtk format storred in ./VTK folder.
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Enter `particlesPhasicFlow` command to create the initial fields for particles.
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Enter `geometryPhasicFlow` command to create the Geometry.
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At last, enter `sphereGranFlow` command to start the simulation.
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After finishing the simulation, you can use `pFlowtoVTK` to convert the results into vtk format stored in ./VTK folder.
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@ -53,10 +53,6 @@ model
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0.97 0.85
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1.00); // coefficient of normal restitution
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et (1.0 1.0 1.0
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1.0 1.0
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1.0); // coefficient of tangential restitution
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mu (0.65 0.65 0.35
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0.65 0.35
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0.35); // dynamic friction
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@ -8,8 +8,6 @@ fileFormat ASCII;
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/*---------------------------------------------------------------------------*/
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active Yes; // is insertion active -> Yes or No
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checkForCollision No; // is checked -> Yes or No
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/*
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Two layers of particles are packed one-by-one using 1 insertion steps
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*/
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@ -31,8 +29,7 @@ layerrightregion // Right Layer Region
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cylinderInfo
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{
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p2 (-0.15 0.25 0.05); //
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p2 (-0.15 0.25 0.05); // Top of cylinderRegion (m,m,m)
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p1 (-0.15 0.24 0.05); // Bottom of cylinderRegion (m,m,m)
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@ -1,15 +0,0 @@
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/* -------------------------------*- C++ -*--------------------------------- *\
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| phasicFlow File |
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| copyright: www.cemf.ir |
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\* ------------------------------------------------------------------------- */
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objectName sphereDict;
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objectType sphereShape;
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fileFormat ASCII;
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/*---------------------------------------------------------------------------*/
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// names of shapes
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names (smallSphere largeSphere);
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// diameter of shapes (m)
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diameters (0.004 0.005);
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// material names for shapes
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materials (lightMat heavyMat);
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@ -13,25 +13,8 @@ globalBox // Simulation domain: every par
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max (-0.068 0.355 0.125); // upper corner point of the box
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}
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decomposition
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{
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direction z;
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}
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boundaries
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{
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neighborListUpdateInterval 50; /* Determines how often (how many iterations) do you want to
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rebuild the list of particles in the neighbor list
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of all boundaries in the simulation domain */
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updateInterval 10; // Determines how often do you want to update the new changes in the boundary
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neighborLength 0.004; // The distance from the boundary plane within which particles are marked to be in the boundary list
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left
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{
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type exit; // other options: periodic, reflective
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@ -79,4 +79,3 @@ surfaces
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motion rotAxis; // motion component name
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}
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}
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@ -52,27 +52,7 @@ setFields
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positionParticles // positions particles
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{
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method ordered; // other options: random and empty
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mortonSorting Yes; // perform initial sorting based on morton code?
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orderedInfo
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{
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diameter 0.005; // minimum space between centers of particles
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numPoints 20000; // number of particles in the simulation
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axisOrder (z y x); // axis order for filling the space with particles
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}
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regionType box; // other options: cylinder and sphere
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boxInfo // box information for positioning particles
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{
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min (-0.08 -0.08 0.015); // lower corner point of the box
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max ( 0.08 0.08 0.2); // upper corner point of the box
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}
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method empty; // other options: random and ordered
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}
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@ -20,7 +20,8 @@ timePrecision 6; // maximum number of digits for time
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g (0 -9.8 0); // gravity vector (m/s2)
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includeObjects (diameter); // save necessary (i.e., required) data on disk
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// save necessary (i.e., required) data on disk
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includeObjects (diameter);
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// exclude unnecessary data from saving on disk
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excludeObjects (rVelocity.dy1 pStructPosition.dy1 pStructVelocity.dy1);
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@ -31,4 +32,4 @@ writeFormat ascii; // data writting format (ascii or binary
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timersReport Yes; // report timers (Yes or No)
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timersReportInterval 0.01; // time interval for reporting timers
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timersReportInterval 0.1; // time interval for reporting timers
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