[Alber]

Hello, I am trying to analyze the flow through a catalyst. I do the mesh the interior volume separating the inlet pipe, the catalyst volume, and the outlet pipe.

The problem is when I pass it to Fluent, since in "Boundary Conditions", the contact surfaces are considered as 'wall', instead of 'interior'.

When ANSYS does the mesh, it creates two contact surfaces, but I supose it isn't enough.

How can I solve this?

Thank you very much!

[A CFD free user]

OK pal,
It seems that there are more than one surface in the mentioned place (it may two surfaces overlap on each other), so you can't distinct them easily. It's a very common mistake during model design which comes from wrong usage of split tool. I had the same problem many times and I resolved it with making some effort.
I hope it helps

[Alber]

Thank you very much for your reply.

I have found the problem. I must enable 'Assembly Meshing' in the 'Mesh Details'. The mesh hadn't continuity, so Fluent considered them as wall, that is to say, different objects.

Problem solved!!

Kind regards!!