Update README.md
This commit is contained in:
ramin1728
GitHub
parent
8490668d51
commit
4642f858db
|
|
@ -1,5 +1,6 @@
|
|||
# Simulating a small rotating drum {#rotatingDrumSmall}
|
||||
## Problem definition
|
||||
|
||||
The problem is to simulate a rotating drum with the diameter 0.24 m and the length 0.1 m rotating at 11.6 rpm. It is filled with 30,000 4-mm spherical particles. The timestep for integration is 0.00001 s.
|
||||
<div align="center"><b>
|
||||
a view of rotating drum
|
||||
|
|
@ -10,14 +11,15 @@ a view of rotating drum
|
|||
***
|
||||
|
||||
## Setting up the case
|
||||
PhasicFlow simulation case setup is based on the text-based scripts that we provide in two folders located in the simulation case folder: `settings` and `caseSetup` (You can find the case setup files in the above folders.
|
||||
All the commands should be entered in the terminal while the current working directory is the simulation case folder (at the top of the `caseSetup` and `settings`).
|
||||
|
||||
The PhasicFlow simulation case setup is based on the text-based scripts that we provide in two folders located in the simulation case folder: `settings` and `caseSetup` (You can find the case setup files in the above folders.
|
||||
All commands should be entered in the terminal with the current working directory being the simulation case folder (at the top of the `caseSetup` and `settings` folders).
|
||||
|
||||
|
||||
### Creating particles
|
||||
|
||||
Open the file `settings/particlesDict`. Two dictionaries, `positionParticles` and `setFields` position particles and set the field values for the particles.
|
||||
In dictionary `positionParticles`, the positioning `method` is `positionOrdered`, which position particles in order in the space defined by `box`. `box` space is defined by two corner points `min` and `max`. In dictionary `positionOrderedInfo`, `numPoints` defines number of particles; `diameter`, the distance between two adjacent particles, and `axisOrder` defines the axis order for filling the space by particles.
|
||||
Open the file `settings/particlesDict`. Two dictionaries, `positionParticles` and `setFields`, position particles and set field values for the particles.
|
||||
In the dictionary `positionParticles`, the positioning method is `positionOrdered`, which positions particles in order in the space defined by `box`. The `box` space is defined by two corner points `min` and `max`. In the dictionary `positionOrderedInfo`, `numPoints` defines the number of particles, `diameter` the distance between two adjacent particles, and `axisOrder` the axis order for filling the space with particles.
|
||||
|
||||
<div align="center">
|
||||
in <b>settings/particlesDict</b> file
|
||||
|
|
@ -26,25 +28,26 @@ in <b>settings/particlesDict</b> file
|
|||
```C++
|
||||
positionParticles
|
||||
{
|
||||
method positionOrdered; // ordered positioning
|
||||
maxNumberOfParticles 40000; // maximum number of particles in the simulation
|
||||
mortonSorting Yes; // perform initial sorting based on morton code?
|
||||
method ordered; // other options: random and empty
|
||||
|
||||
box // box for positioning particles
|
||||
orderedInfo
|
||||
{
|
||||
min (-0.08 -0.08 0.015); // lower corner point of the box
|
||||
diameter 0.004; // minimum space between centers of particles
|
||||
numPoints 30000; // number of particles in the simulation
|
||||
axisOrder (z y x); // axis order for filling the space with particles
|
||||
}
|
||||
|
||||
regionType box; // other options: cylinder and sphere
|
||||
|
||||
boxInfo // box for positioning particles
|
||||
{
|
||||
min (-0.08 -0.08 0.015); // lower corner point of the box
|
||||
|
||||
max ( 0.08 0.08 0.098); // upper corner point of the box
|
||||
}
|
||||
|
||||
positionOrderedInfo
|
||||
{
|
||||
diameter 0.004; // minimum space between centers of particles
|
||||
numPoints 30000; // number of particles in the simulation
|
||||
axisOrder (z y x); // axis order for filling the space with particles
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
In dictionary `setFields`, dictionary `defaultValue` defines the initial value for particle fields (here, `velocity`, `acceleration`, `rotVelocity`, and `shapeName`). Note that `shapeName` field should be consistent with the name of shape that you later set for shapes (here one shape with name `sphere1`).
|
||||
In the `setFields` dictionary, the `defaultValue` dictionary defines the initial value for particle fields (here `velocity`, `acceleration`, `rotVelocity` and `shapeName`). Note that the `shapeName` field should match the name of the shape that you will later set for shapes (here a shape named `sphere1`).
|
||||
|
||||
<div align="center">
|
||||
in <b>settings/particlesDict</b> file
|
||||
|
|
@ -55,10 +58,10 @@ setFields
|
|||
{
|
||||
defaultValue
|
||||
{
|
||||
velocity realx3 (0 0 0); // linear velocity (m/s)
|
||||
acceleration realx3 (0 0 0); // linear acceleration (m/s2)
|
||||
rotVelocity realx3 (0 0 0); // rotational velocity (rad/s)
|
||||
shapeName word sphere1; // name of the particle shape
|
||||
velocity realx3 (0 0 0); // linear velocity (m/s)
|
||||
acceleration realx3 (0 0 0); // linear acceleration (m/s2)
|
||||
rotVelocity realx3 (0 0 0); // rotational velocity (rad/s)
|
||||
shapeName word sphere1; // name of the particle shape
|
||||
}
|
||||
selectors
|
||||
{}
|
||||
|
|
@ -70,6 +73,7 @@ Enter the following command in the terminal to create the particles and store th
|
|||
`> particlesPhasicFlow`
|
||||
|
||||
### Creating geometry
|
||||
|
||||
In file `settings/geometryDict` , you can provide information for creating geometry. Each simulation should have a `motionModel` that defines a model for moving the surfaces in the simulation. `rotatingAxisMotion` model defines a fixed axis which rotates around itself. The dictionary `rotAxis` defines an motion component with `p1` and `p2` as the end points of the axis and `omega` as the rotation speed in rad/s. You can define more than one motion component in a simulation.
|
||||
|
||||
<div align="center">
|
||||
|
|
@ -77,21 +81,21 @@ in <b>settings/geometryDict</b> file
|
|||
</div>
|
||||
|
||||
```C++
|
||||
motionModel rotatingAxisMotion;
|
||||
motionModel rotatingAxis;
|
||||
.
|
||||
.
|
||||
.
|
||||
rotatingAxisMotionInfo
|
||||
rotatingAxisInfo
|
||||
{
|
||||
rotAxis
|
||||
{
|
||||
p1 (0.0 0.0 0.0); // first point for the axis of rotation
|
||||
p2 (0.0 0.0 1.0); // second point for the axis of rotation
|
||||
omega 1.214; // rotation speed (rad/s)
|
||||
omega 1.214; // rotation speed (rad/s)
|
||||
}
|
||||
}
|
||||
```
|
||||
In the dictionary `surfaces` you can define all the surfaces (walls) in the simulation. Two main options are available: built-in geometries in PhasicFlow, and providing surfaces with stl file. Here we use built-in geometries. In `cylinder` dictionary, a cylindrical shell with end radii, `radius1` and `radius2`, axis end points `p1` and `p2`, `material` name `prop1`, `motion` component `rotAxis` is defined. `resolution` sets number of division for the cylinder shell. `wall1` and `wall2` define two plane walls at two ends of cylindrical shell with coplanar corner points `p1`, `p2`, `p3`, and `p4`, `material` name `prop1` and `motion` component `rotAxis`.
|
||||
The `surfaces` dictionary allows you to define all surfaces (walls) in the simulation. There are two main options: built-in geometries in PhasicFlow and providing surfaces with stl file. Here we will use built-in geometries. In the `cylinder` dictionary a cylindrical shell with end radii `radius1` and `radius2`, axis end points `p1` and `p2`, material name `prop1`, motion component `rotAxis` is defined. `resolution` sets the resolution of the cylinder hull. wall1` and `wall2` define two plane walls at two ends of the cylindrical shell with coplanar vertices `p1`, `p2`, `p3` and `p4`, `material` name `prop1` and `motion` component `rotAxis`.
|
||||
|
||||
<div align="center">
|
||||
in <b>settings/geometryDict</b> file
|
||||
|
|
@ -138,7 +142,8 @@ Enter the following command in the terminal to create the geometry and store it
|
|||
`> geometryPhasicFlow`
|
||||
|
||||
### Defining properties and interactions
|
||||
In the file `caseSetup/interaction` , you find properties of materials. `materials` defines a list of material names in the simulation and `densities` sets the corresponding density of each material name. model dictionary defines the interaction model for particle-particle and particle-wall interactions. `contactForceModel` selects the model for mechanical contacts (here nonlinear model with limited tangential displacement) and `rollingFrictionModel` selects the model for calculating rolling friction. Other required prosperities should be defined in this dictionary.
|
||||
|
||||
The `caseSetup/interaction' file contains material properties. `materials` defines a list of material names in the simulation and `densities` sets the corresponding density of each material name. model dictionary defines the interaction model for particle-particle and particle-wall interactions. ContactForceModel selects the model for mechanical contacts (here nonlinear model with limited tangential displacement) and `rollingFrictionModel` selects the model for the calculation of rolling friction. Other required properties should be defined in this dictionary.
|
||||
|
||||
<div align="center">
|
||||
in <b>caseSetup/interaction</b> file
|
||||
|
|
@ -165,7 +170,7 @@ model
|
|||
}
|
||||
```
|
||||
|
||||
Dictionary `contactSearch` sets the methods for particle-particle and particle-wall contact search. `method` specifies the algorithm for finding neighbor list for particle-particle contacts and `wallMapping` shows how particles are mapped onto walls for finding neighbor list for particle-wall contacts. `updateFrequency` sets the frequency for updating neighbor list and `sizeRatio` sets the size of enlarged cells (with respect to particle diameter) for finding neighbor list. Larger `sizeRatio` include more particles in the neighbor list and you require to update it less frequent.
|
||||
Dictionary `contactSearch` sets the methods for particle-particle and particle-wall contact search. method' specifies the algorithm for finding the neighbor list for particle-particle contacts and `wallMapping' specifies how particles are mapped to walls for finding the neighbor list for particle-wall contacts. `updateFrequency` specifies the frequency for updating the neighbor list and `sizeRatio` specifies the size of enlarged cells (with respect to particle diameter) for neighbor list search. Larger `sizeRatio` includes more particles in the neighbor list and you need to update it less frequently.
|
||||
|
||||
<div align="center">
|
||||
in <b>caseSetup/interaction</b> file
|
||||
|
|
@ -174,22 +179,17 @@ in <b>caseSetup/interaction</b> file
|
|||
```C++
|
||||
contactSearch
|
||||
{
|
||||
method NBS; // method for broad search particle-particle
|
||||
wallMapping cellsSimple; // method for broad search particle-wall
|
||||
method NBS; // method for broad search particle-particle
|
||||
|
||||
updateInterval 10;
|
||||
|
||||
NBSInfo
|
||||
{
|
||||
updateFrequency 20; // each 20 timesteps, update neighbor list
|
||||
sizeRatio 1.1; // bounding box size to particle diameter (max)
|
||||
}
|
||||
sizeRatio 1.1;
|
||||
|
||||
cellsSimpleInfo
|
||||
{
|
||||
updateFrequency 20; // each 20 timesteps, update neighbor list
|
||||
cellExtent 0.7; // bounding box for particle-wall search (> 0.5)
|
||||
}
|
||||
cellExtent 0.55;
|
||||
|
||||
adjustableBox Yes;
|
||||
}
|
||||
|
||||
```
|
||||
|
||||
In the file `caseSetup/sphereShape`, you can define a list of `names` for shapes (`shapeName` in particle field), a list of diameters for shapes and their `properties` names.
|
||||
|
|
|
|||
Loading…
Reference in New Issue