I’m in the midst of playing with Simscale as a sort of proof-of-concept tool for some wing and sidepod designs. To benchmark the setup, I have a rear wing design that has a validated downforce number of about 130 pounds at 60 mph. This number was first calculated by StarCCM+ and then verified in a wind tunnel, so I want to try to get Simscale to match that number. I ran a CFD of the wing with a pretty decent sized enclosure and got a downforce number of about 200 pounds, so the simulation is overshooting the number quite a bit. The mesh is about 1.9 million cells, and the setup is an incompressible CFD with the standard air properties provided by the software. The inlet is a velocity inlet at 60 mph, outlet is a pressure outlet, the walls of the enclosure are slip walls, and the whole wing including endplates is set to be a no-slip wall. My familiarity with CFD is pretty limited, so since the model converges, I’m kind of assuming that the solution is related to a small change in set up. Automatic boundary layers were also used.
Any suggestions on what I can/should try to adjust?