I am designing a car as part of a school project, the aim being to reduce the drag as much as possible and maximize downforce. I have completed a design in Autodesk Alias and exported it as a STEP file. After many failed attempts, (at first due to a faulty mesh, then due to the simulation being too resource intensive for a free account) I managed to complete a simulation. I tried to use this tutorial to help me. I had previously ran successful simulation, but the were much simpler. This latest run completed, but the result is very strange. There isn’t much to explain that wouldn’t be easier to see for yourself: https://www.simscale.com/projects/BrunoI/epq_2/
There is strange behavior in the convergence plot, forces and moments graph, forces and moments coefficients graph, and If you look at the particle traces they seem to be recirculating strangely.
I assigned the wheels as rotating walls, and the air vents beside and behind the windows as pressure outlets to better model the behaviour of the tires and vents. Maybe this is the source of the issues? I also increased the timestep to 2s to reduce simulation time, IDK if this would have such a large effect.
This project is due soon and I have no idea what to do so any help is greatly appreciated.