[giorgianig]

Dear all,

I am modeling a network of pipes, here is a simplified geometry that contains the issue:


I would like to mesh the three straight pipes with structured hexahedra and the Ts with unstructured thetrahedra. I have make a partition with 10 solids (3 Ts and 7 straight pipes) :


I start meshing using submeshes from the central T with Netgen 3D-2D-1D, applying boundary layers on walls, and propogating on pipes with 3D extrusion, everything seems to go smoothly

There is the boundary layer on the walls as wanted

However, when I try to export to OpenFoam (I use salomeToOpenFOAM.py because there are piramids in the mesh), the export fails

and some defaultPatches are generated in the mesh tree:

I think those defaultPatches are generating the export error, and I think they are generated because the mesh is not conformal. I visualized these patches, here is where they are located:

and here is the shape

So those patches are genereated at the interface pipe/T when the T mesh is generated AFTER the pipe mesh. Using a clip also it is clear the mesh is not conformal.

Before the T


After the T:


Does anyone know how to fix it and generate a valid mesh?
Thanks in advance