Rahul Mule
Ansys Employee

Hi Pulak,

  1. Please check fluent transcript file (.trn) to check what is causing issue.
  2. It seems like mapping is not happening properly. Please review 'mesh statistics' and 'mapping summary' in system coupling log file (scLog.scl).

Please refer the best practices to setup system coupling project. Best Practices for System Coupling (ansys.com)

Hope this helps!