Hello everybody,

I'm doing a 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.

For the convergence, the resiudals should fall by a magnitude of 10^-3 respectively 10^-6. I do a steady state simulation with 2000 iterations. But i don't reach the values to say, that my system is converged (please see the attached picture).

What can i do for reaching a converging system?

The zipped project was to big to upload it here, you can download it from the link below:

Please tell me, if you need additonal information.

Thanks for your help,