[Neepor]

Hello,

I am new to CFD. I am trying to model flow around a rotating sphere (baseball). I was able to solve it with icoFoam but I am having trouble using a turbulent solver, specifically with k and epsilon.

Right now I am using pisoFoam (RAS k-epsilon) solver.

I tried to calculate k and epsilon. Reading this gave me the impression that external flow over an object which starts moving from standstill (like a baseball) is a low turbulence case and so my turbulent intensity should be less than one percent.

So I set Intensity = 0.005, mean flow velocity = 34 m/s (speed of the throw) and Length = 0.038 m (the radius of the baseball).

I used the formulas here with Cu^1, not the ones with Cu^(3/4)

You can download my case folder here.

Any help in getting my solution to converge would be great! Thanks.