Fluid flow channel in cantilever beam

Hello,

My model is the following: a cantilever beam has one longitudinal channel containing a fluid flow. My goal is to find the effects of the fluid flow (viscosity, velocity, size of the channel) on the damping of the beam.

Until now, I was using "Solid Mechanics" looking at the frequency response of the beam around its eigenfrequencies (to estimate damping). But when I add a laminar flow, the results do not change. I have changed the parameters of the fluid, but still no changes.

I would like to know:
1) How to make sure the 2 physics are solved.
2) Am I right to use these 2 physics (Solid mechanics + Laminar flow) over Fluid-flow interaction.

Thanks for your help,

Matthias