Add ReadMe file via Upload
This commit is contained in:
Omid Khosravi
GitHub
parent
d4dc0d7e80
commit
04d7ecfe9e
|
|
@ -0,0 +1,244 @@
|
|||
# Problem Definition
|
||||
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 drum.
|
||||
* **20000** particles with **4 mm** diameter, at the rate of 20000 particles/s for 1 sec.
|
||||
|
||||
<html>
|
||||
<body>
|
||||
<div align="center"><b>
|
||||
a view of the tote-blender while rotating
|
||||
</div></b>
|
||||
<div align="center">
|
||||
<img src="sample sample sample sample", width=700px>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
# Setting up the Case
|
||||
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 two folders: `caseSetup`, `setting`. (see the above folders). Unlike the previous cases, this case does not have the `stl` file. and the geometry is described in the `geometryDict` file.
|
||||
|
||||
## Defining particles
|
||||
Then in the `caseSetup/sphereShape` the diameter and the material name of the particles are defined.
|
||||
```C++
|
||||
// names of shapes
|
||||
names (sphere1);
|
||||
// diameter of shapes (m)
|
||||
diameters (0.004);
|
||||
// material names for shapes
|
||||
materials (prop1);
|
||||
```
|
||||
## Particle Insertion
|
||||
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.
|
||||
|
||||
<div align="center">
|
||||
in <b>caseSetup/particleInsertion</b> file
|
||||
</div>
|
||||
|
||||
```C++
|
||||
// positions particles
|
||||
positionParticles
|
||||
{
|
||||
// ordered positioning
|
||||
method positionOrdered;
|
||||
// maximum number of particles in the simulation
|
||||
maxNumberOfParticles 40000;
|
||||
// perform initial sorting based on morton code?
|
||||
mortonSorting Yes;
|
||||
// box for positioning particles
|
||||
box
|
||||
{
|
||||
// lower corner point of the box
|
||||
min (-0.06 -0.06 0.08);
|
||||
// upper corner point of the box
|
||||
max (0.06 0.06 0.18);
|
||||
}
|
||||
```
|
||||
## Interaction between particles
|
||||
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).
|
||||
```C++
|
||||
// a list of materials names
|
||||
materials (prop1);
|
||||
// density of materials [kg/m3]
|
||||
densities (1000.0);
|
||||
|
||||
contactListType sortedContactList;
|
||||
|
||||
model
|
||||
{
|
||||
contactForceModel nonLinearNonLimited;
|
||||
rollingFrictionModel normal;
|
||||
/*
|
||||
Property (prop1-prop1);
|
||||
*/
|
||||
// Young modulus [Pa]
|
||||
Yeff (1.0e6);
|
||||
// Shear modulus [Pa]
|
||||
Geff (0.8e6);
|
||||
// Poisson's ratio [-]
|
||||
nu (0.25);
|
||||
// coefficient of normal restitution
|
||||
en (0.7);
|
||||
// coefficient of tangential restitution
|
||||
et (1.0);
|
||||
// dynamic friction
|
||||
mu (0.3);
|
||||
// rolling friction
|
||||
mur (0.1);
|
||||
|
||||
}
|
||||
```
|
||||
## Settings
|
||||
### Geometry
|
||||
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.
|
||||
```C++
|
||||
surfaces
|
||||
{
|
||||
enterGate
|
||||
{
|
||||
// type of wall
|
||||
type planeWall;
|
||||
// coords of wall
|
||||
p1 (-0.05 -0.05 0.3);
|
||||
p2 (-0.05 0.05 0.3);
|
||||
p3 ( 0.05 0.05 0.3);
|
||||
p4 (0.05 -0.05 0.3);
|
||||
// material of wall
|
||||
material prop1;
|
||||
// motion component name
|
||||
motion rotAxis;
|
||||
}
|
||||
|
||||
cylinderinlet
|
||||
{
|
||||
// type of the wall
|
||||
type cylinderWall;
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 0.28);
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.3);
|
||||
// radius at p1
|
||||
radius1 0.03;
|
||||
// radius at p2
|
||||
radius2 0.03;
|
||||
// number of divisions
|
||||
resolution 36;
|
||||
// material name of this wall
|
||||
material prop1;
|
||||
// motion component name
|
||||
motion rotAxis;
|
||||
}
|
||||
|
||||
coneShelltop
|
||||
{
|
||||
// type of the wall
|
||||
type cylinderWall;
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 0.2);
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.28);
|
||||
// radius at p1
|
||||
radius1 0.1;
|
||||
// radius at p2
|
||||
radius2 0.03;
|
||||
// number of divisions
|
||||
resolution 36;
|
||||
// material name of this wall
|
||||
material prop1;
|
||||
// motion component name
|
||||
motion rotAxis;
|
||||
}
|
||||
|
||||
cylinderShell
|
||||
{
|
||||
// type of the wall
|
||||
type cylinderWall;
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 0.1);
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.2);
|
||||
// radius at p1
|
||||
radius1 0.1;
|
||||
// radius at p2
|
||||
radius2 0.1;
|
||||
// number of divisions
|
||||
resolution 36;
|
||||
// material name of this wall
|
||||
material prop1;
|
||||
// motion component name
|
||||
motion rotAxis;
|
||||
}
|
||||
|
||||
coneShelldown
|
||||
{
|
||||
// type of the wall
|
||||
type cylinderWall;
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 0.02);
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.1);
|
||||
// radius at p1
|
||||
radius1 0.03;
|
||||
// radius at p2
|
||||
radius2 0.1;
|
||||
// number of divisions
|
||||
resolution 36;
|
||||
// material name of this wall
|
||||
material prop1;
|
||||
// motion component name
|
||||
motion rotAxis;
|
||||
}
|
||||
/*
|
||||
This is a plane wall at the exit of silo
|
||||
*/
|
||||
|
||||
cylinderoutlet
|
||||
{
|
||||
// type of the wall
|
||||
type cylinderWall;
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 0.0);
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.02);
|
||||
// radius at p1
|
||||
radius1 0.03;
|
||||
// radius at p2
|
||||
radius2 0.03;
|
||||
// number of divisions
|
||||
resolution 36;
|
||||
// material name of this wall
|
||||
material prop1;
|
||||
// motion component name
|
||||
motion rotAxis;
|
||||
}
|
||||
exitGate
|
||||
{
|
||||
type planeWall;
|
||||
p1 (-0.05 -0.05 0);
|
||||
p2 (-0.05 0.05 0);
|
||||
p3 ( 0.05 0.05 0);
|
||||
p4 (0.05 -0.05 0);
|
||||
material prop1;
|
||||
motion rotAxis;
|
||||
}
|
||||
|
||||
}
|
||||
```
|
||||
### Rotating Axis Info
|
||||
In this part of `geometryDict` the information of rotating axis and speed of rotation are defined. Unlike the previous cases, the rotation of this blender starts at time=**0 s**.
|
||||
```C++
|
||||
rotatingAxisMotionInfo
|
||||
{
|
||||
rotAxis
|
||||
{
|
||||
p1 (-0.1 0.0 0.15); // first point for the axis of rotation
|
||||
p2 (0.1 0.0 0.15); // second point for the axis of rotation
|
||||
omega 3; // rotation speed (rad/s)
|
||||
}
|
||||
}
|
||||
```
|
||||
## Performing Simulation
|
||||
To perform simulations, enter the following commands one after another in the terminal.
|
||||
|
||||
Enter `$ particlesPhasicFlow` command to create the initial fields for particles.
|
||||
Enter `$ geometryPhasicFlow` command to create the Geometry.
|
||||
At last, enter `$ sphereGranFlow` command to start the simulation.
|
||||
After finishing the simulation, you can use `$ pFlowtoVTK` to convert the results into vtk format storred in ./VTK folder.
|
||||
Loading…
Reference in New Issue