Example: flow over a cube

1) create a computational domain using blockMesh (Hexagonal)

2) using toposetDict, define the geometry of the cube:

actions
(

{
name blockFaces;
type cellSet;
action new;
source boxToCell;
sourceInfo
{
box (-2 -2 -2)(2 2 2);
}
}

{
name blockFaces;
type cellSet;
action invert;

}

);

3) run “toposet” in the terminal

4) run “subsetMesh -overwrite blockFaces -patch block” in the terminal

5) check your mesh using paraview