[powpow]

Hallo,

I have a general question regarding a CAD-Model that can be used with ICEM CFD.

I have to do a simple CFD-Simulation how an additional tube in a test chamber influences the air flow.
The air enters the test chamber at Position 1. Then, one part of the air leaves the chamber through the nozzle at positon 2, the rest of the air through the new tube (Position 3).
So I build a CAD-Model of the test chamber with CATIA V5. The CAD-Model is a surface model, no solid.

I'd like to create a mesh with 10 layers of prism around the tube and the small nozzle, the rest of the volume should be filled with tetra.

Before I can do this, I have to create BODIES I think?!

Therefore I need closed surfaces I think!?

So here are my questions:

1. Do I have to add surfarces at the positions 1-3 (green circles)? Doing so would close my test chamber.

2. Do I also have to add surfaces at the positions 4-8 (red circles with green surrounding)?

3. How many BODIES do I have to create?

I couldn't find some information regarding such geometry in the tutorials or the Manual, so I would be very thankful if someone has an idea...

Cheers powpow