Hello everybody,

I'm doing a steady state simulation of the flow in an annular gap. The inner cylinder is modelled as a rotating wall and the outer one is a stationary wall. The left and right side are stationary walls as well. All in all, it is a closed system. I'm using the realizable k-epsilon model with enhanced wall treatment. I'm using the pressure-based coupled solver.

I want to do the mesh refinement. The first simulation with the original mesh works without any problems. For the refinement, i decrease the size of the elements and starts the simulation again with the refined mesh. But then, i get the following error:

Divergence detected in amg solver pressure coupled

Does anyone have an idea why the error occured and how to solve it?

Thanks a lot for your help,

trippled