simulation of relative rotation in FLUENT
 

Hi Dears
I want to simulate two solid cylinders with relative rotation in Fluent.
one cylinder rotate around its axis while its axis is attached to second cylinder, so the second cylinder has rotation around its axis too. actually, axis of first cylinder rotate around axis of second cylinder.

now

the question is:

How could i set boundary conditions for these walls (cylinders) with kind of relative rotation?

tanks