[hokhay]

Hi all, I am now to FloEFD and vehicle aerodynamic simulation. I am trying to compute lift and drag for a car with wheel spinning. I use local region averaging method to simulate wheel spin. The rotation region is slightly larger than the wheel, so its boundary sits between wheel arch and the wheel.

The result that I get is very different from the result I got with simple closed wheel with rotating wall instead of local region rotation. I have noticed the pressure difference between inside and outside of the rotating region is very large, especially at location where air flow is tangential to the rotating region.

https://www.dropbox.com/s/2mz6s4t7cdtx2lv/Preview%20wheel%20centre.bmp.bmp?dl=0
https://www.dropbox.com/s/ac0zh7p0ll...x.bmp.bmp?dl=0


Could anyone tell me what have I done wrong? What is the best method for wheel spin simulation please?

Thank you
Jason