Rotating objects

Marcus Gellert (Gellert)

Hi all,

I have a question regarding moving meshes in terms of a rotationg cylinder.
I found the 2D mixer example in icoTopoFoam and removed the blades.
But i don't like the sliding patches in the inside because they producing strange
results if I close the cylinder at top and botton with stationary solid walls.
My question: is it possible to define movements in terms of rotation without the mixer
class, e.g. use icoAutoFoam and define the inner wall as a rotating wall?

My second question concerns the property of the default boundary condition 'empty patch'.
What does it mathematically mean? Exists a more detailed description of usable boundary
conditions and also of the way the system of equations are implemented and solved?

Thank you.