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How to decide Courant number as solution progresses?

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Old   June 21, 2020, 10:06
Default How to decide Courant number as solution progresses?
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Narendra
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Hello, ##Fluent.

I am using pressure based solver, implicit scheme, VOF method (solving steady state open channel flow), k-e-RNG, and Coupled algo. Initially, I assigned Courant number = 10 and got flow field but residual for continuity is not dropping in the order of 10^-5. Also, I have mass imbalance problem (mass inflow is not matching with mass outflow). For coarser mesh, I didn't face mass imbalance problem but to improve results, I have refined mesh, and this unexpected problem showed up. I am using under relaxation factors 0.3. Is it due to inappropriate value of Courant number? Any suggestion to drop the residual of continuity and get mass balance?
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