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Hello Mert,
I need more information about this error but typically in cfx there can be convergence issuesÂ
Occasionally you may find that jobs submitted in serial will converge while those in parallel fail. This can be due to the different internal structure of the multigrid solver. The partitioned mesh leads to different coarse mesh blocking than the serial mesh, and if you have selected a timestep size that is close to the critical convergence limit, this can cause convergence problems.
Usually a reduction in the timestep size alleviates this problem.
I hope this helps you .
Thanks,