I have a 3D geometry composed by a domain and two subdomains.

I have solved a problem using a 2D extruded mesh from CFX-MESH. With tetrahedral elements. I have defined the Domain Interface connection as 1:1 and it runs perfect.

Then I tried to solve it using a 2D extruded mesh from ICEM CFD. With hexahedral elements. I can't use a 1:1 interface connection, so the problem doesn't converge. Why can't I use 1:1 connection here? Can I change some parameter?

If I do a tetrahedral mesh with CFX-MESH I can use 1:1 connection; but if I do the same mesh with ICEM CFD I can´t use 1:1 (only GGI connection). Why???

Hi,

I suspect the meshes are not lining up on either side of the interface. The difference might only be small. There is a tolerance for determining whether the mesh on either side of a periodic boundary, you could try increasing it if your meshes are almost but not quite matching.

On a side issue: GGI interfaces for most flows are quite stable and should not cause failure to converge. I suspect there is a problem with your simulation setup.

Glenn Horrocks

I have increased a lot the mesh tolerance but I still have the problem (I can´t use a 1:1 connection). Perhaps there is an option in ICEM CFD to change the tolerance.