Rahul Mule
Ansys Employee

Hello,

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.