[kpax]

hey folks,

i am currently encountering the problem that even for very small time-steps (0.0001), the courant number of my problem explodes at some point of the simulation (in icoFoam). Since i have to simulate ~50s in total, I really dont wanna go to even smaller time steps.
I think the problem is mesh quality, because the simulation stayed stable a bit longer when I used more non-orthogonal corrector steps. plus i could see in the results that the velocity exploded in regions of low mesh quality...

so my question is this: what kind of mesh errors have the biggest influence on the courant number, according to your experience?
so far, i have mainly focused on improving equiangle skewness, but i'm not sure if that is really the best choice.


btw: both "smooth elements globally" and "smooth hexahedral mesh - orthogonal" did not work for me at all (made it all worse) - is there someone else who experienced that?


best,
kpax