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Thanks I will try that.
1- About the mesh I meant more about the different regions I have designed or my mesh methods.
2- I did another simulation with the mesh that coupled simulation can be run, but this time I increased the number of iterations to 40 from 20 and also activated porudction limiter in my k-epsilone model. In the first few time step it did not converge but slowly started to converge after 30 iterations, however, after a few seconds it needed more iterations to converge. could you please help me with that ? I have also plotted a report definitoin. Based on thay do you think the results are reliable or they are not correct ?