There are a number of controls that play a role in good convergence, including: ‐ Initialization ‐ Time Step Size ‐ Stability Controls (structural) ‐ Number of Fluent iterations per step ‐ Number of Coupling Iterations ‐ Interface Under Relaxation Factors ‐ Choice of data to transfer.
Try suitable inputs to these parameters as per your case to achieve good convergence.
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