how to apply velocity to the plate for the analysis of couette flow in fluent

define the top plate condition as moving one n define the velocity.

hi I have a question about couette flows. I want to derive some non-dimentinal group for this kind of flow and I used p-bakingham theory but it dosent helped much. since I'v made my solution with fluent,I'll be glade to know the correct boundary conditions and best models satisfy coette flows. and if there is a nondimentional group relating pressure drop along couette and its quantity(m3/s)I'll be glade to be aware of them. thnx