Lift- and drag coefficient on rotating cylinder in a uniform stream

Hi all,
I'm trying to plot the lift and drag force on a rotating cylinder in a uniform stream (2D) for low Re=100. I've been successfull with calculating/plot the coefficient for the non-rotating cylinder which is well in order with literature.

For the non-rotating cylinder I've used the non-slip boundary condition on the cylinder and the expression: -reacf(v)*2/(spf.rho*U_mean^2*d) for the lift coefficient. Where d is the cylinder diameter and U_mean is the free stream velocity.

Now, when I set the boundary to "sliding wall" and set a rotation velocity the calculated lift force C_L=-reacf(v)*2/(spf.rho*U_mean^2*d)=0. Why is that?

EDIT: I've attached the comsol-file
Thank you /Erik