Without inflation layer I got to the end of my simulation without any mayor troubles, just some cells where the turbulent ratio limit exceeded. I used a dt of 0.001s.

That´s the question... I might need to try both (coarse/fine) and see how big the differences are. Do you have any tips for multiphase in general? What are the most critical parameters/controls/methods as a rule of thumb?

Thanks for helping me out