Rahul
Ansys Employee

Hi,

That's all right.

Please create a simple geometry as in my initial response and follow the procedure to make internal boundary as inlet/outlet. And then you can try the same on your actual geometry.

You can also refer to section 6.12.6Slitting Face Zone inĀ  6.12. Modifying the Mesh (ansys.com) to know more about the operation.