[Joachim]

Hi everyone!

I have been trying to run simple 2D RANS simulations over an incompressible airfoil, from 0deg to 15deg. I thing I need some help!

Everything works just fine when I use a steady solver. However, things do not work quite so well in time-accurate mode. They work, but the CFL constraint forces me to use a very low time step. Basically, it takes 32,000 time steps for a particle to go from leading edge to trailing edge. Slightly excessive I'd say.

If I use 5 outer correctors in pimpleFoam, the CFL remains more or less steady, around 80 (the value that I want). Still, I am afraid that sooner or later, it will keep on increasing and eventually explode...

Is there any way to run such simulations with larger time-steps, while maintaining spatial and time accuracy? Some colleagues use OverFlow and Fun3D and they have no problem with that.

Thank you very much for your help!

Joachim