I am trying to model a raceway pond driven by a paddle wheel in Flow Simulation. The pond is open to atmosphere and I am given the velocity at the paddle wheel location. I have modeled a solid wall across the channel and up to the height of the fluid (water). I am using an External Flow Analysis and have set the Computational Domain boundary at the height of the fluid and initial conditions at atmospheric temperature and pressure. Can I use an internal fan with the inlet and outlet faces being either side of the wall to simulate a momentum driver at the paddle wheel (see image below)? I am looking to see the flow trajectory and velocity around the bends. What are the proper boundary conditions for this situation to simulate pond flow?
cap off the "water surface"
do this as an internal analysis
use an internal fan
set frictionless wall at the surface of the water