Moving Porous Layer

Josh

Hi

I am modeling roughness in a microchannel by using a porous layer at the wall. I have set up a UDF that defines this layer and it works fine. I would now like to create a model that implements roughness and slip boundary by having just the porous layer move based on the following,

F_PROFILE(f,thread,index)=fabs((1e-7)*C_U_G(c,cell_thread)[1]);

which is of the form: Kn*H*du/dy

Is there a way to do this?