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diameter->distance, update in tutorials, v-Blender readme.md
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Hamidreza
@ -1,4 +1,5 @@
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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 +16,13 @@ The problem is to simulate a rotating drum with a diameter of 0.24 m, a length o
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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 sorted in three folders: `caseSetup`, `setting` and `stl`.
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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/shapes` 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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@ -28,8 +32,8 @@ diameters (0.004 0.005);
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materials (lightMat heavyMat);
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```
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## Particle Insertion
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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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@ -39,31 +43,44 @@ in <b>caseSetup/particleInsertion</b> file
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```C++
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// Right Layer Region
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layerrightregion
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// Right Region
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right_region
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{
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// type of insertion region
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timeControl simulationTime;
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regionType cylinder;
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// insertion rate (particles/s)
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// type of insertion region
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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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timeControl simulationTime;
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// Start time of insertion (s)
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startTime 0;
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// End time of LightParticles insertion (s)
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// End time of insertion (s)
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endTime 1;
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// Time Interval of LightParticles insertion (s)
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// Time Interval of insertion (s)
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insertionInterval 0.025;
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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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p1 (-0.15 0.24 0.05);
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// radius of cylinder (m)
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radius 0.035;
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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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p1 (-0.15 0.24 0.05);
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// radius of cylinder (m)
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radius 0.035;
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}
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setFields
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{
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velocity realx3 (0.0 -0.6 0.0); // initial velocity of inserted particles
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}
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mixture
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{
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smallSphere 1; // mixture composition of inserted particles
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}
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}
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```
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## Interaction between particles and walls
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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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@ -73,36 +90,37 @@ materials (lightMat heavyMat wallMat);
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// density of materials [kg/m3]
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densities (1000 1500 2500);
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/*
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/*
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Property (lightMat-lightMat lightMat-heavyMat lightMat-wallMat
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heavyMat-heavyMat heavyMat-wallMat
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wallMat-wallMat );
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*/
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// Young modulus [Pa]
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*/
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// Young modulus [Pa]
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Yeff (1.0e6 1.0e6 1.0e6
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1.0e6 1.0e6
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1.0e6);
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// Shear modulus [Pa]
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// Shear modulus [Pa]
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Geff (0.8e6 0.8e6 0.8e6
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0.8e6 0.8e6
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0.8e6);
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// Poisson's ratio [-]
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// Poisson's ratio [-]
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nu (0.25 0.25 0.25
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0.25 0.25
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0.25);
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// coefficient of normal restitution
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// coefficient of normal restitution
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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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// dynamic friction
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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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0.35);
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// rolling friction
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// rolling friction
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mur (0.1 0.1 0.1
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0.1 0.1
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0.1);
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```
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## Settings
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### Geometry
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In the `settings/geometryDict` file, the geometry and axis of rotation is defined for the drum. The geometry is composed of a body, front and rear ends.
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@ -163,28 +181,32 @@ 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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motionModel rotatingAxis;
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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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// first point for the axis of rotation
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p1 (-0.1974 0.2269 0);
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// second point for the axis of rotation
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p2 (-0.1974 0.2269 0.1);
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// rotation speed (rad/s) => 15 rpm
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omega 2.38733;
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// Start time of Geometry Rotating
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startTime 2;
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// End time of Geometry Rotating
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endTime 9.5;
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p1 (-0.1974 0.2269 0);
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// second point for the axis of rotation
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p2 (-0.1974 0.2269 0.1);
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// rotation speed (rad/s) => 15 rpm
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omega 2.38733;
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// Start time of Geometry Rotating
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startTime 2;
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// End time of Geometry Rotating
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endTime 9.5;
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}
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}
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```
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## Performing Simulation
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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 stored in ./VTK folder.
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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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