Hello.I've a turbine combustion chamber with several internal walls (thin surfaces,0 thickness) correctly meshed (unstructured tetraedral mesh) with ICEM. ICEM can see the internal walls and mesh them as surfaces, but when I import the mesh in CFX-5, all internal structures disappear from the list of the potential boundary condition surfaces. Reading the user manual of CFX-5 the problem seems to be that every internal walls MUST divide 2 different sub-domains in order to be treated as a boundary condition. Anyway, for geometry generation problems, it's very hard for me define in ICEM many different materials, and so many sub-domains in CFX-5. Someone have any ideas to bypass the problem? Thank you. Luca

There's no way to do this without creating extra material blocks on HEXA. And on CFX-5 you'll have to create several sub-domains. On the boundary conditions setup you must specify each combination of surfaces which will be thin walls... I think there's no way to avoid that.

cfd guy.

Thank you for your reply. Anyway,if someone other is interested, a guy gave me a trick to avoid my problems (for TETRA meshing): in ICEM, in the menu Geometry->Mesh parameters->All families ,you've to click for every family of interior walls BOTH the button of 'internal wall' and 'split wall'.In that way ICEM generates 2 different triangular meshes on the 2 sides of the thin surfaces, and CFX-5 views them even if they're on the interior of a 3D fluid material zone! (NB:in CFX-5 'create mesh' menu, you've NOT to click on duplicate check:use defaults setting). Thank you again,and have a nice day! Luca

Hi Luca,

Firstly, CFX-5.6 does not have this problem.

If you must continue using 5.5.1, define the surface in ICEM as a thin-cut. This will cause it to create separate nodes at for each side of the surface. If you DO NOT CHECK duplicate node checking when you import your mesh, CFX-5 will display these as separate surfaces.

Regards, Robin