Hi, I’m looking for some CFD simulation advice on a car cfd simulation. The model is a partial model as I’m experimenting with a diffuser and venting at the back end. I had been getting reasonable results until I introduced the rear wheel as a rotating wall boundary condition and my negative lift suddenly became a massive positive lift. I was expecting some lift from the wheel but now I appear to have created a flying machine!
You will see the project has a number of geometries and multiple simulations, the idea being to do a number of runs on the different geometries to see which provided the best combination of down force and drag. Once I started to see problems I concentrated on doing a number of runs on incompressible 10 changing settings to see if I could solve the problem. In each case though the rotating wheel continues to cause problems and appears to be sucking in all the air in the flow region.
The project it at https://www.simscale.com/projects/ecobeast/extended_rear_diffuser/
Any help would be appreciated.