[Mahendra_Paipuri]

Hello All

I am working on natural convection and radiation model in a square cavity having finite wall thickness. The geometry of the problem can be seen in attachment.

The outer part is the solid part and inner part is the fluid which contains air. I see from the tutorials and forums, that I can give the thickness of the wall rather than explicitly meshing it. But I want to mesh the solid part as I have to compare the temperature in the middle of the both flanges with experimental data.

I am using ANSYS meshing module to generate mesh. If I make named sections of the top, bottom, left and right sides of outer edges, I cannot use S2S radiation model and it is giving me error saying no boundary is found adjacent to fluid region. If I make a named section of all internal walls in the meshing module, I am not able to specify a coupled boundary condition on the internal walls and they are acting as adiabatic walls.

Can someone please suggest me how to model this particular problem in FLUENT?

Thanks