Rahul Mule
Ansys Employee

Hi Judith,

When a co-simulation coupling participant, such as a Fluent system, is connected to a Mechanical
system via System Coupling, Mechanical is given access to data directly from the other participant. So, I would suggest you to create conformal mesh and specify the velocity at the extended part and transfer data directly from Fluent to Mechanical through system coupling.

System Coupling (ansys.com)