[Vinko]

Hi guys,
Im doing a simulation of an open wheel racing car for my dissertation and im just running through a few test cases to justify my settings. Im currently stuck on simulating a cylinder tangent to a flat plate representing the wheel-road interface. I ran simulations for both the road itself and the cylinder in ground effects as 2D studies and my results were as expected. When i ran a 2D study of the cylinders as a rotating wall next to the ground I got some very weird results, namely negative drag?!?!??
I then ran it again as a 3D study and got a more realistic result, so a drag force. Any idea why this could happen? I know that a 2D study implies that the cylinder runs along the same width as the road, and the 3D study is able to model the two trailing vortexes which occur because the air slips over the edges of the wheel but it still seems wrong to me that a rotating cylinder (my 2D study) would have lower pressure at the leading edge as compared to the trailing edge thus causing negative drag


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