Reply To: How to simulate 3D analysis of water flow(open-channel flow) for an undershot turbine.

[Raef.Kobeissi]

Hi!
There is a slight difference between 2D and 3D simulation. My simulation was a 2D model therefore the interface between the 2 domain has been automatically allocated as interior. For your case I would auggest not to create 2 domain but only one which encompasses the wall of the turbine.
Cheers