Rahul Mule
Ansys Employee

Hi,

Please export the system coupling files and try it in standalone system coupling with Quasi-Newton stabilization (i-QN). It will improve the stability of the solution and improve convergence.

Quasi-Newton stabilization is not supported for System Coupling in Workbench. To apply stabilization to a coupled analysis created in Workbench, export the coupling setup so the analysis can be executed in System Coupling's GUI or CLI.

Please refer Quasi-Newton Stabilization Algorithm (ansys.com) for more information.