revise the readme and domainDict
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@ -1,5 +1,4 @@
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# Simulating a small rotating drum {#rotatingDrumSmall}
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## Problem definition (v-1.0)
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# Problem definition (v-1.0)
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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.
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<div align="center"><b>
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a view of rotating drum
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@ -25,27 +24,27 @@ in <b>settings/particlesDict</b> file
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```C++
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positionParticles // positions particles
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{
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method ordered; // other options: random and empty
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method ordered; // other options: random and empty
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mortonSorting Yes; // perform initial sorting based on morton code?
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mortonSorting Yes; // perform initial sorting based on morton code?
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orderedInfo
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{
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diameter 0.004; // minimum space between centers of particles
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orderedInfo
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{
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diameter 0.004; // minimum space between centers of particles
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numPoints 30000; // number of particles in the simulation
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numPoints 30000; // number of particles in the simulation
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axisOrder (z y x); // axis order for filling the space with particles
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}
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axisOrder (z y x); // axis order for filling the space with particles
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}
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regionType box; // other options: cylinder and sphere
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regionType box; // other options: cylinder and sphere
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boxInfo // box information for positioning particles
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{
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min (-0.08 -0.08 0.015); // lower corner point of the box
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boxInfo // box information for positioning particles
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{
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min (-0.08 -0.08 0.015); // lower corner point of the box
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max ( 0.08 0.08 0.098); // upper corner point of the box
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}
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max ( 0.08 0.08 0.098); // upper corner point of the box
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}
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}
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```
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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`).
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@ -55,38 +54,38 @@ in <b>settings/particlesDict</b> file
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</div>
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```C++
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defaultValue
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{
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velocity realx3 (0 0 0); // linear velocity (m/s)
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defaultValue
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{
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velocity realx3 (0 0 0); // linear velocity (m/s)
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acceleration realx3 (0 0 0); // linear acceleration (m/s2)
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acceleration realx3 (0 0 0); // linear acceleration (m/s2)
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rVelocity realx3 (0 0 0); // rotational velocity (rad/s)
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rVelocity realx3 (0 0 0); // rotational velocity (rad/s)
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shapeName word sphere1; // name of the particle shape
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}
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shapeName word sphere1; // name of the particle shape
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}
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selectors
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{
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shapeAssigne
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{
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selector stridedRange; // other options: box, cylinder, sphere, randomPoints
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selectors
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{
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shapeAssigne
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{
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selector stridedRange; // other options: box, cylinder, sphere, randomPoints
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stridedRangeInfo
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{
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begin 0; // begin index of points
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stridedRangeInfo
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{
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begin 0; // begin index of points
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end ; // end index of points
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end ; // end index of points
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stride 3; // stride for selector
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}
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stride 3; // stride for selector
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}
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fieldValue // fields that the selector is applied to
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{
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shapeName word sphere1; // sets shapeName of the selected points to largeSphere
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}
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}
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}
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fieldValue // fields that the selector is applied to
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{
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shapeName word sphere1; // sets shapeName of the selected points to largeSphere
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}
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}
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}
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```
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Enter the following command in the terminal to create the particles and store them in `0` folder.
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@ -105,14 +104,14 @@ motionModel rotatingAxis;
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rotatingAxisInfo // information for rotatingAxisMotion motion model
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{
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rotAxis
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{
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p1 (0.0 0.0 0.0); // first point for the axis of rotation
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rotAxis
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{
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p1 (0.0 0.0 0.0); // first point for the axis of rotation
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p2 (0.0 0.0 1.0); // second point for the axis of rotation
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p2 (0.0 0.0 1.0); // second point for the axis of rotation
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omega 1.214; // rotation speed (rad/s)
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}
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omega 1.214; // rotation speed (rad/s)
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}
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}
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```
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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`.
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@ -124,70 +123,70 @@ in <b>settings/geometryDict</b> file
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```C++
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surfaces
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{
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/*
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A cylinder with begin and end radii 0.12 m and axis points at (0 0 0) and (0 0 0.1)
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*/
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/*
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A cylinder with begin and end radii 0.12 m and axis points at (0 0 0) and (0 0 0.1)
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*/
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cylinder
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{
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type cylinderWall; // type of the wall
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cylinder
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{
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type cylinderWall; // type of the wall
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p1 (0.0 0.0 0.0); // begin point of cylinder axis
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p1 (0.0 0.0 0.0); // begin point of cylinder axis
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p2 (0.0 0.0 0.1); // end point of cylinder axis
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p2 (0.0 0.0 0.1); // end point of cylinder axis
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radius1 0.12; // radius at p1
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radius1 0.12; // radius at p1
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radius2 0.12; // radius at p2
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radius2 0.12; // radius at p2
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resolution 24; // number of divisions
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resolution 24; // number of divisions
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material prop1; // material name of this wall
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material prop1; // material name of this wall
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motion rotAxis; // motion component name
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}
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motion rotAxis; // motion component name
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}
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/*
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This is a plane wall at the rear end of cylinder
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*/
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/*
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This is a plane wall at the rear end of cylinder
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*/
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wall1
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{
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type planeWall; // type of the wall
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wall1
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{
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type planeWall; // type of the wall
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p1 (-0.12 -0.12 0.0); // first point of the wall
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p1 (-0.12 -0.12 0.0); // first point of the wall
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p2 ( 0.12 -0.12 0.0); // second point
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p2 ( 0.12 -0.12 0.0); // second point
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p3 ( 0.12 0.12 0.0); // third point
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p3 ( 0.12 0.12 0.0); // third point
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p4 (-0.12 0.12 0.0); // fourth point
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p4 (-0.12 0.12 0.0); // fourth point
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material prop1; // material name of the wall
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material prop1; // material name of the wall
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motion rotAxis; // motion component name
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}
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motion rotAxis; // motion component name
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}
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/*
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This is a plane wall at the front end of cylinder
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*/
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/*
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This is a plane wall at the front end of cylinder
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*/
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wall2
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{
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type planeWall; // type of the wall
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wall2
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{
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type planeWall; // type of the wall
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p1 (-0.12 -0.12 0.1); // first point of the wall
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p1 (-0.12 -0.12 0.1); // first point of the wall
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p2 ( 0.12 -0.12 0.1); // second point
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p2 ( 0.12 -0.12 0.1); // second point
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p3 ( 0.12 0.12 0.1); // third point
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p3 ( 0.12 0.12 0.1); // third point
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p4 (-0.12 0.12 0.1); // fourth point
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p4 (-0.12 0.12 0.1); // fourth point
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material prop1; // material name of the wall
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material prop1; // material name of the wall
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motion rotAxis; // motion component name
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}
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motion rotAxis; // motion component name
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}
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}
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```
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Enter the following command in the terminal to create the geometry and store it in `0/geometry` folder.
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@ -209,16 +208,16 @@ densities (1000.0); // density of materials [kg/m3]
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.
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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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contactForceModel nonLinearNonLimited;
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rollingFrictionModel normal;
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Yeff (1.0e6); // Young modulus [Pa]
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Geff (0.8e6); // Shear modulus [Pa]
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nu (0.25); // Poisson's ratio [-]
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en (0.7); // coefficient of normal restitution
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et (1.0); // coefficient of tangential restitution
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mu (0.3); // dynamic friction
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mur (0.1); // rolling friction
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Yeff (1.0e6); // Young modulus [Pa]
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Geff (0.8e6); // Shear modulus [Pa]
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nu (0.25); // Poisson's ratio [-]
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en (0.7); // coefficient of normal restitution
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et (1.0); // coefficient of tangential restitution
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mu (0.3); // dynamic friction
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mur (0.1); // rolling friction
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}
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```
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@ -234,15 +233,15 @@ contactListType sortedContactList;
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contactSearch
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{
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method NBS; // method for broad search
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method NBS; // method for broad search
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updateInterval 10;
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updateInterval 10;
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sizeRatio 1.1;
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sizeRatio 1.1;
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cellExtent 0.55;
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cellExtent 0.55;
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adjustableBox Yes;
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adjustableBox Yes;
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}
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```
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@ -254,9 +253,9 @@ in <b>caseSetup/sphereShape</b> file
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</div>
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```C++
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names (sphere1); // names of shapes
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diameters (0.004); // diameter of shapes
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materials (prop1); // material names for shapes
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names (sphere1); // names of shapes
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diameters (0.004); // diameter of shapes
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materials (prop1); // material names for shapes
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```
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Other settings for the simulation can be set in file `settings/settingsDict`.
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@ -268,30 +267,30 @@ in <b>settings/settingsDict</b> file
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```C++
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run rotatingDrumSmall;
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dt 0.00001; // time step for integration (s)
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dt 0.00001; // time step for integration (s)
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startTime 0; // start time for simulation
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startTime 0; // start time for simulation
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endTime 10; // end time for simulation
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endTime 10; // end time for simulation
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saveInterval 0.1; // time interval for saving the simulation
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saveInterval 0.1; // time interval for saving the simulation
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timePrecision 6; // maximum number of digits for time folder
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timePrecision 6; // maximum number of digits for time folder
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g (0 -9.8 0); // gravity vector (m/s2)
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g (0 -9.8 0); // gravity vector (m/s2)
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includeObjects (diameter); // save necessary (i.e., required) data on disk
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// exclude unnecessary data from saving on disk
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excludeObjects (rVelocity.dy1 pStructPosition.dy1 pStructVelocity.dy1);
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integrationMethod AdamsBashforth2; // integration method
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integrationMethod AdamsBashforth2; // integration method
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writeFormat ascii; // data writting format (ascii or binary)
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writeFormat ascii; // data writting format (ascii or binary)
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timersReport Yes; // report timers (Yes or No)
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timersReport Yes; // report timers (Yes or No)
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timersReportInterval 0.01; // time interval for reporting timers
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timersReportInterval 0.01; // time interval for reporting timers
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```
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The dictionary `domain` defines the a rectangular bounding box with two corner points for the simulation. Each particle that gets out of this box, will be deleted automatically.
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@ -303,59 +302,47 @@ in <b>settings/domainDict</b> file
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```C++
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globalBox // Simulation domain: every particles that goes outside this domain will be deleted
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{
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min (-0.12 -0.12 0.00); // lower corner point of the box
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min (-0.12 -0.12 0.00); // lower corner point of the box
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max (0.12 0.12 0.11); // upper corner point of the box
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max (0.12 0.12 0.11); // upper corner point of the box
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}
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decomposition
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{
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direction z;
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direction z;
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}
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boundaries
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{
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left
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{
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type exit; // other options: periodic, reflective
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}
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neighborListUpdateInterval 50; /* Determines how often (how many iterations) do you want to
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right
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{
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type exit; // other options: periodic, reflective
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}
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rebuild the list of particles in the neighbor list
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bottom
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{
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type exit; // other options: periodic, reflective
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}
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of all boundaries in the simulation domain */
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top
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{
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type exit; // other options: periodic, reflective
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}
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updateInterval 10; // Determines how often do you want to update the new changes in the boundary
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rear
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{
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type exit; // other options: periodic, reflective
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}
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neighborLength 0.004; // The distance from the boundary plane within which particles are marked to be in the boundary list
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left
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{
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type exit; // other options: periodict, reflective
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}
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right
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{
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type exit; // other options: periodict, reflective
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}
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bottom
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{
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type exit; // other options: periodict, reflective
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}
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top
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{
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type exit; // other options: periodict, reflective
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}
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rear
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{
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type exit; // other options: periodict, reflective
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}
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front
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{
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type exit; // other options: periodict, reflective
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}
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front
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{
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type exit; // other options: periodic, reflective
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}
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}
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```
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@ -368,4 +355,4 @@ The solver for this simulation is `sphereGranFlow`. Enter the following command
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## Post processing
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After finishing the simulation, you can render the results in Paraview. To convert the results to VTK format, just enter the following command in the terminal. This will converts all the results (particles and geometry) to VTK format and store them in folder `VTK/`.
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`> pFlowToVTK`
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`> pFlowToVTK --binary`
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@ -8,9 +8,9 @@ fileFormat ASCII;
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/*---------------------------------------------------------------------------*/
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globalBox // Simulation domain: every particles that goes outside this domain will be deleted
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{
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min (-0.12 -0.12 0.00); // lower corner point of the box
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min (-0.12 -0.12 0.00); // lower corner point of the box
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max (0.12 0.12 0.11); // upper corner point of the box
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max (0.12 0.12 0.11); // upper corner point of the box
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}
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decomposition
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@ -20,45 +20,33 @@ decomposition
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boundaries
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{
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neighborListUpdateInterval 50; /* Determines how often (how many iterations) do you want to
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rebuild the list of particles in the neighbor list
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of all boundaries in the simulation domain */
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updateInterval 10; // Determines how often do you want to update the new changes in the boundary
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neighborLength 0.004; // The distance from the boundary plane within which particles are marked to be in the boundary list
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left
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{
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type exit; // other options: periodict, reflective
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type exit; // other options: periodict, reflective
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}
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right
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{
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type exit; // other options: periodict, reflective
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type exit; // other options: periodict, reflective
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}
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bottom
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{
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type exit; // other options: periodict, reflective
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type exit; // other options: periodict, reflective
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}
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top
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{
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type exit; // other options: periodict, reflective
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type exit; // other options: periodict, reflective
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}
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rear
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{
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type exit; // other options: periodict, reflective
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type exit; // other options: periodict, reflective
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}
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front
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{
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type exit; // other options: periodict, reflective
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type exit; // other options: periodict, reflective
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}
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}
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