Merge branch 'main' of https://github.com/PhasicFlow/phasicFlow into main
This commit is contained in:
Hamidreza Norouzi
commit
ad1a948f5f
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@ -1,5 +1,5 @@
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# Problem Definition
|
||||
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.
|
||||
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.
|
||||
* **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
|
||||
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 (mixer) 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. Particles are positioned before start of simulation to fill the blender.
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* **24000** particles with **5 mm** diameter are positioned, in order, and let to be settled under gravity. After settling particles, this blender starts to rotate at t=**1s**.
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||||
|
||||
<html>
|
||||
<body>
|
||||
|
|
@ -8,238 +8,22 @@ The problem is to simulate a double pedestal tote blender with the diameter **0.
|
|||
a view of the tote-blender while rotating
|
||||
</div></b>
|
||||
<div align="center">
|
||||
<img src="sample sample sample sample", width=700px>
|
||||
<img src="https://github.com/PhasicFlow/phasicFlow/blob/media/media/Tote-blender.gif", width=700px>
|
||||
</div>
|
||||
<div align="center"><i>
|
||||
particles are colored according to their velocity
|
||||
</div></i>
|
||||
</body>
|
||||
</html>
|
||||
|
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# 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.
|
||||
As it has been explained in the previous cases, the simulation case setup is based on text-based scripts. Here, the simulation case setup files are stored into two folders: `caseSetup`, `setting` (see the above folders). Unlike the previous cases, this case does not have the `stl` file and the surfaces are defined based on the built-in utilities in phasicFlow. See next the section for more information on how we can setup the geometry and its rotation.
|
||||
|
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## 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);
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// material names for shapes
|
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materials (prop1);
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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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## Geometry
|
||||
|
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<div align="center">
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in <b>caseSetup/particleInsertion</b> file
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</div>
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### Defining rotation axis
|
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In file `settings/geometryDict` the information of rotating axis and speed of rotation are defined. The rotation of this blender starts at time=**0.5 s** and ends at time=**9.5 s**.
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||||
|
||||
```C++
|
||||
// positions particles
|
||||
positionParticles
|
||||
{
|
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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;
|
||||
// perform initial sorting based on morton code?
|
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mortonSorting Yes;
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// cylinder for positioning particles
|
||||
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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// radius of cylinder
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radius 0.066;
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}
|
||||
|
||||
positionOrderedInfo
|
||||
{
|
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// minimum space between centers of particles
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||||
diameter 0.003;
|
||||
// number of particles in the simulation
|
||||
numPoints 20000;
|
||||
// axis order for filling the space with particles
|
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axisOrder (z y x);
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||||
}
|
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}
|
||||
```
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## 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
|
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materials (prop1);
|
||||
// density of materials [kg/m3]
|
||||
densities (1000.0);
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||||
|
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contactListType sortedContactList;
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||||
|
||||
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);
|
||||
|
||||
}
|
||||
```
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## 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
|
||||
{
|
||||
topGate
|
||||
topGate
|
||||
{
|
||||
// type of wall
|
||||
type cylinderWall;
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 0.299);
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.3);
|
||||
// radius at p1
|
||||
radius1 0.03;
|
||||
// radius at p2
|
||||
radius2 0.0001;
|
||||
// material of wall
|
||||
material solidProperty;
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
topCylinder
|
||||
{
|
||||
// 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 axisOfRotation;
|
||||
}
|
||||
|
||||
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 axisOfRotation;
|
||||
}
|
||||
|
||||
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 axisOfRotation;
|
||||
}
|
||||
|
||||
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 axisOfRotation;
|
||||
}
|
||||
/*
|
||||
This is a plane wall at the exit of silo
|
||||
*/
|
||||
|
||||
bottomCylinder
|
||||
{
|
||||
// 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 axisOfRotation;
|
||||
}
|
||||
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 axisOfRotation;
|
||||
}
|
||||
|
||||
}
|
||||
```
|
||||
### 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++
|
||||
// information for rotatingAxisMotion motion model
|
||||
rotatingAxisMotionInfo
|
||||
|
|
@ -247,19 +31,326 @@ rotatingAxisMotionInfo
|
|||
axisOfRotation
|
||||
{
|
||||
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
|
||||
p2 ( 0.1 0.0 0.15); // second point for the axis of rotation
|
||||
|
||||
omega 1.5708; // rotation speed ==> 15 rad/s
|
||||
// Start time of Geometry Rotating (s)
|
||||
startTime 1;
|
||||
// End time of Geometry Rotating (s)
|
||||
|
||||
// Start time of Geometry Rotating (s)
|
||||
startTime 0.5;
|
||||
|
||||
// End time of Geometry Rotating (s)
|
||||
endTime 9.5;
|
||||
}
|
||||
}
|
||||
```
|
||||
## Performing Simulation
|
||||
|
||||
|
||||
### Surfaces
|
||||
In `settings/geometryDict` file, the surfaces and motion component of each surface are defined to form a rotating tote-blender. The geometry is composed of top and bottom cylinders, top and bottom cones, a cylindrical shell and top and bottom Gates.
|
||||
|
||||
```C++
|
||||
surfaces
|
||||
{
|
||||
|
||||
topGate
|
||||
{
|
||||
// type of wall
|
||||
type cylinderWall;
|
||||
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 0.3);
|
||||
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.301);
|
||||
|
||||
// radius at p1
|
||||
radius1 0.03;
|
||||
|
||||
// radius at p2
|
||||
radius2 0.0001;
|
||||
|
||||
// material of wall
|
||||
material solidProperty;
|
||||
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
topCylinder
|
||||
{
|
||||
// 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 solidProperty;
|
||||
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
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 solidProperty;
|
||||
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
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 solidProperty;
|
||||
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
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 solidProperty;
|
||||
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
bottomCylinder
|
||||
{
|
||||
// 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 solidProperty;
|
||||
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
exitGate
|
||||
{
|
||||
|
||||
// type of the wall
|
||||
type cylinderWall;
|
||||
|
||||
// begin point of cylinder axis
|
||||
p1 (0.0 0.0 -0.001);
|
||||
|
||||
// end point of cylinder axis
|
||||
p2 (0.0 0.0 0.0);
|
||||
|
||||
// radius at p1
|
||||
radius1 0.03;
|
||||
|
||||
// radius at p2
|
||||
radius2 0.0001;
|
||||
|
||||
// number of divisions
|
||||
resolution 36;
|
||||
|
||||
// material name of this wall
|
||||
material solidProperty;
|
||||
|
||||
// motion component name
|
||||
motion axisOfRotation;
|
||||
}
|
||||
|
||||
}
|
||||
```
|
||||
|
||||
## Defining particles
|
||||
### Diameter and material of spheres
|
||||
In the `caseSetup/sphereShape` the diameter and the material name of the particles are defined.
|
||||
|
||||
<div align="center">
|
||||
in <b>caseSetup/sphereShape</b> file
|
||||
</div>
|
||||
|
||||
```C++
|
||||
// name of shapes
|
||||
names (sphere1);
|
||||
|
||||
// diameter of shapes (m)
|
||||
diameters (0.005);
|
||||
|
||||
// material name for shapes
|
||||
materials (solidProperty);
|
||||
```
|
||||
### Particle positioning before start of simulation
|
||||
Particles are positioned before the start of simulation. The positioning can be ordered or random. Here we use ordered positioning. 24000 particles are positioned in a cylinderical region inside the tote-blender.
|
||||
|
||||
<div align="center">
|
||||
in <b>settings/particlesDict</b> file
|
||||
</div>
|
||||
|
||||
```C++
|
||||
// positions particles
|
||||
positionParticles
|
||||
{
|
||||
// ordered positioning
|
||||
method positionOrdered;
|
||||
|
||||
// maximum number of particles in the simulation
|
||||
maxNumberOfParticles 25001;
|
||||
|
||||
// perform initial sorting based on morton code?
|
||||
mortonSorting Yes;
|
||||
|
||||
// cylinderical region for positioning particles
|
||||
cylinder
|
||||
{
|
||||
p1 (0.0 0.0 0.09);
|
||||
p2 (0.0 0.0 0.21);
|
||||
radius 0.09;
|
||||
}
|
||||
|
||||
positionOrderedInfo
|
||||
{
|
||||
// minimum space between centers of particles
|
||||
diameter 0.005;
|
||||
|
||||
// number of particles in the simulation
|
||||
numPoints 24000;
|
||||
|
||||
// axis order for filling the space with particles
|
||||
axisOrder (x y z);
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Interaction between particles
|
||||
In `caseSetup/interaction` file, material names and properties and interaction parameters are defined. Since we are defining 1 material type in the simulation, the interaction matrix is 1x1 (interactions are symmetric).
|
||||
```C++
|
||||
// a list of materials names
|
||||
materials (solidProperty);
|
||||
|
||||
// density of materials [kg/m3]
|
||||
densities (1000.0);
|
||||
|
||||
contactListType sortedContactList;
|
||||
|
||||
model
|
||||
{
|
||||
contactForceModel nonLinearNonLimited;
|
||||
|
||||
rollingFrictionModel normal;
|
||||
|
||||
/*
|
||||
Property (solidProperty-solidProperty);
|
||||
*/
|
||||
|
||||
// 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);
|
||||
}
|
||||
```
|
||||
|
||||
# Performing Simulation and previewing the results
|
||||
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.
|
||||
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.
|
||||
After finishing the simulation, you can use `$ pFlowtoVTK` to convert the results into vtk format stored in ./VTK folder.
|
||||
|
|
|
|||
Loading…
Reference in New Issue