[MrScience]

Dear All Foamers,

I am using the 'rotatingWallVelocity' boundary condition for a rotating device. The description of the boundary condition available in OpenFOAM is; "Replaces the normal of the patch value so the flux across the patch is zero"

I would appreciate if someone could explain how this type of boundary condition actually takes place, both from a mathematical point of view and from a physical point of view. In particular, I am curious on how the effect of the boundary condition is reflected on the flow field around the patch.

Many thanks in advance!