[SerSe]

Dear all,

I am meshing an air nozzle inside a gas pipe for CFD analysis. I want to have two separate domains for the nozzle and the pipe, and I can get this through blocking. But when I define the INTERIOR boundary condition at the interface between the two domains (i.e., where the nozzle exits into the pipe), I get the following error in Fluent

"Inappropriate zone type for one-sided face zone. Changing to wall"

I guess this happens becasue I have two overlapping meshes - if I display node numbers, there are overlapping nodes at the nozzle exit - obtained when meshing separately the two domains.

Is there any way to merge the two domains? I already tried with nodes merging but it does not work - the error in Fluent is

"Cannot change nozzle_outlet to interior because there is only one adjacent cell thread"

How to overcome this? Please help!

Thank you very much,

SerSe