[Gmsh] Gmsh may mistakenly treats an interface surface between two regions as a boundary surface

[Junhui Liu]

Hi All, 

I am generating structured tetra meshes (without the final recombine)  inside and outside a pipe. Please see the attache plot. Using structured tetra meshes outside the pipe is to control the time step size.  There are three regions generated. Two are structured tetra meshes and another one is the regular unstructured tetra mesh.  Somehow our internal code complains that "Boundary face construction failed with: xxx faces remaining”. if I use a version that does not care about boundary construction, It appears that the results of the cylindrical surface pointed by blue arrows behave very strangely and look like those of a boundary face. If I take region III away, the problem disappears. I have also attached the pipe.geo file. 

I have to say GMSH has lots of functionalities to control mesh and I really like it. I hope this problem can be resolved soon. Thanks a lot for your help.

Jun
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