PhasicFlow
GitHub
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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 beining inserted during simulation to fill the drum.
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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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* **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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@ -1,6 +1,6 @@
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# Problem Definition
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The problem is to simulate a double pedestal tote blender with the diameter **0.03 m** and **0.1 m** respectively, the length **0.3 m**, rotating at **28 rpm**. This blender is filled with **20000** Particles. The timestep for integration is **0.00001 s**. There is one type of Particle in this blender that are being inserted during simulation to fill the blender.
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* **20000** particles with **4 mm** diameter, at the rate of 20000 particles/s for 1 sec. َAfter settling particles, this blender starts to rotate at t=**1s**.
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The problem is to simulate a double pedestal tote blender with the diameter **0.03 m** and **0.1 m** respectively, the length **0.3 m**, rotating at **28 rpm**. This blender is filled with **24000** Particles. The timestep for integration is **0.00001 s**. There is one type of Particle in this blender that are being inserted during simulation to fill the blender.
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* **24000** particles with **5 mm** diameter, at the rate of 24000 particles/s for 1 sec. َAfter settling particles, this blender starts to rotate at t=**1s**. For better and faster performace in simulations where the number of particles is very large, the format of the files is saved as **ASCII**.
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<html>
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<body>
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@ -19,12 +19,14 @@ As it has been explained in the previous cases, the simulation case setup is bas
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## Defining particles
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Then in the `caseSetup/sphereShape` the diameter and the material name of the particles are defined.
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```C++
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// names of shapes
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// name of shapes
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names (sphere1);
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// diameter of shapes (m)
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diameters (0.004);
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// material names for shapes
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materials (prop1);
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diameters (0.005);
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// material name for shapes
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materials (solidProperty);
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```
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## Particle Insertion
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In this case we have a region for ordering particles. These particles are placed in this blender. For example the script for the inserted particles is shown below.
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@ -39,36 +41,44 @@ positionParticles
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{
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// ordered positioning
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method positionOrdered;
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// maximum number of particles in the simulation
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maxNumberOfParticles 40000;
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maxNumberOfParticles 25001;
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// perform initial sorting based on morton code?
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mortonSorting Yes;
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// cylinder for positioning particles
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cylinder
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{
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// Coordinates of top cylinderRegion (m,m,m)
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p1 (0.05 0.0 0.12);
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p2 (0.05 0.0 0.22);
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p1 (0.0 0.0 0.09);
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p2 (0.0 0.0 0.21);
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// radius of cylinder
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radius 0.066;
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radius 0.09;
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}
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positionOrderedInfo
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{
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// minimum space between centers of particles
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diameter 0.003;
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diameter 0.005;
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// number of particles in the simulation
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numPoints 20000;
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numPoints 24000;
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// axis order for filling the space with particles
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axisOrder (z y x);
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axisOrder (x y z);
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}
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}
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```
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## Interaction between particles
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In `caseSetup/interaction` file, material names and properties and interaction parameters are defined: interaction between the particles of rotating drum. Since we are defining 1 material for simulation, the interaction matrix is 1x1 (interactions are symetric).
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In `caseSetup/interaction` file, material names and properties and interaction parameters are defined: interaction between the particles of Tote Blender. Since we are defining 1 material for simulation, the interaction matrix is 1x1 (interactions are symetric).
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```C++
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// a list of materials names
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materials (prop1);
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materials (solidProperty);
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// density of materials [kg/m3]
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densities (1000.0);
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@ -77,48 +87,62 @@ contactListType sortedContactList;
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model
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{
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contactForceModel nonLinearNonLimited;
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rollingFrictionModel normal;
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/*
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Property (prop1-prop1);
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Property (solidProperty-solidProperty);
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*/
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// Young modulus [Pa]
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Yeff (1.0e6);
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// Shear modulus [Pa]
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Geff (0.8e6);
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// Poisson's ratio [-]
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nu (0.25);
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// coefficient of normal restitution
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en (0.7);
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// coefficient of tangential restitution
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et (1.0);
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// dynamic friction
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mu (0.3);
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// rolling friction
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mur (0.1);
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}
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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 cylinder inlet and outlet, cone shell top and down, a cylinder shell and enter and exit Gate.
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In the `settings/geometryDict` file, the geometry and axis of rotation is defined for the blender. The geometry is composed of a cylinder inlet and outlet, cone shell top and down, a cylinder shell and enter and exit Gate.
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```C++
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surfaces
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{
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topGate
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topGate
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{
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// type of wall
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type cylinderWall;
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// begin point of cylinder axis
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p1 (0.0 0.0 0.299);
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p1 (0.0 0.0 0.3);
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// end point of cylinder axis
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p2 (0.0 0.0 0.3);
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p2 (0.0 0.0 0.301);
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// radius at p1
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radius1 0.03;
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// radius at p2
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radius2 0.0001;
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// material of wall
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material solidProperty;
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// motion component name
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motion axisOfRotation;
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}
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@ -127,18 +151,25 @@ surfaces
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{
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// type of the wall
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type cylinderWall;
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// begin point of cylinder axis
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p1 (0.0 0.0 0.28);
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// end point of cylinder axis
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p2 (0.0 0.0 0.3);
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// radius at p1
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radius1 0.03;
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// radius at p2
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radius2 0.03;
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// number of divisions
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resolution 36;
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// material name of this wall
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material prop1;
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material solidProperty;
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// motion component name
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motion axisOfRotation;
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}
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{
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// type of the wall
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type cylinderWall;
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// begin point of cylinder axis
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p1 (0.0 0.0 0.2);
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// end point of cylinder axis
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p2 (0.0 0.0 0.28);
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// radius at p1
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radius1 0.1;
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// radius at p2
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radius2 0.03;
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// number of divisions
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resolution 36;
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// material name of this wall
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material prop1;
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material solidProperty;
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// motion component name
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motion axisOfRotation;
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}
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@ -167,72 +205,109 @@ surfaces
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{
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// type of the wall
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type cylinderWall;
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// begin point of cylinder axis
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p1 (0.0 0.0 0.1);
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// end point of cylinder axis
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p2 (0.0 0.0 0.2);
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// radius at p1
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radius1 0.1;
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// radius at p2
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radius2 0.1;
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// number of divisions
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resolution 36;
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// material name of this wall
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material prop1;
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material solidProperty;
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// motion component name
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motion axisOfRotation;
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}
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coneShelldown
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{
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// type of the wall
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type cylinderWall;
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// begin point of cylinder axis
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p1 (0.0 0.0 0.02);
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// end point of cylinder axis
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p2 (0.0 0.0 0.1);
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// radius at p1
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radius1 0.03;
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// radius at p2
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radius2 0.1;
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// number of divisions
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resolution 36;
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// material name of this wall
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material prop1;
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material solidProperty;
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// motion component name
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motion axisOfRotation;
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}
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/*
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This is a plane wall at the exit of silo
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*/
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bottomCylinder
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{
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// type of the wall
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type cylinderWall;
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// begin point of cylinder axis
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p1 (0.0 0.0 0.0);
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// end point of cylinder axis
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p2 (0.0 0.0 0.02);
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// radius at p1
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radius1 0.03;
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// radius at p2
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radius2 0.03;
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// number of divisions
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resolution 36;
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// material name of this wall
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material prop1;
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material solidProperty;
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// motion component name
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motion axisOfRotation;
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}
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exitGate
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{
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type planeWall;
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p1 (-0.05 -0.05 0);
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p2 (-0.05 0.05 0);
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p3 ( 0.05 0.05 0);
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p4 (0.05 -0.05 0);
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material prop1;
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// type of the wall
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type cylinderWall;
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// begin point of cylinder axis
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p1 (0.0 0.0 -0.001);
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// end point of cylinder axis
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p2 (0.0 0.0 0.0);
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// radius at p1
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radius1 0.03;
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// radius at p2
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radius2 0.0001;
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// number of divisions
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resolution 36;
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// material name of this wall
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material solidProperty;
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// motion component name
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motion axisOfRotation;
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}
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@ -248,9 +323,12 @@ rotatingAxisMotionInfo
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{
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p1 (-0.1 0.0 0.15); // first point for the axis of rotation
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p2 ( 0.1 0.0 0.15); // second point for the axis of rotation
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omega 1.5708; // rotation speed ==> 15 rad/s
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// Start time of Geometry Rotating (s)
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startTime 1;
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startTime 0.5;
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// End time of Geometry Rotating (s)
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endTime 9.5;
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}
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