[tylerplowright]

Hey,
Having a few problems trying to model a wind tunnel experiment we were required to do. In the experiment we put a small cube in a wind tunnel to see what the lift and drag forces were on it. We have results of around 0.3N of force in drag and no lift (a face was square to the wind). Only problem is when we model this in Ansys CFX we can't get anywhere near that result. We are modelling it as if it were in the tunnel so the distance between the object and the walls/outlet aren't ideal. Inlet speed is 20m/s, Outlet average static pressure is 0Pa (relative to atmospheric).

In nearly of the settings we tried, we haven't been able to get the drag force down below about 0.7N. If it was around about 0.4, I would be happy and would actually potentially be able to get some kind of meaningful result out of it but being over 100% out is a bit too much. We did only eyeball the angle so I'm not looking to model it exactly, but something sort of close would be nice.

As such are there any techniques with meshing that someone would recommend for best capturing the lift and drag of an object? Inflation? Sphere of Influence? Any tips or recommendations would be great.
Thanks
Tyler