Non Rolling Road

After cleaning up the mesh, this is the best result I got after 300 iterations, the wake vortex is quite obvious now, but because of the ground boundary layer, the airspeed under the floor was too slow and there was nothing meaningful gained from the simulation. 

An underfloor view of the car. The air stays stuck to the ground, and there's some backflow at the rear of the car. There is a noticable low pressure area under the front wing, but the rest of the car creates lift 

In the first simulation, I used the F1 car I designed in Fusion and imported it to Autodesk CFD. Running roughly 100 iterations gave this result, but the boundary layer is pretty thick, and there are many artifacts from a low-res mesh. The domain size was too small among other issues. 

Running a hundred or so more iterations gave a better result, however, due to inherent issues with the mesh there's not much that could be done. 

Another view after a few more iterations. 

Another view after a few more iterations. 

Another view after a few more iterations.