[Gmsh] physical surface - volume elements

[Catalina Dominguez Garcia]

Hi everyone,

I'm new in Gmsh. I just want to build a mesh to apply a simple finite
element method example in 3D.

Reading the manual of Gmsh, I can build a mesh for a cube, and also
identify different labels on the boundary by the command "Physical
Surface". However I do not find a command that allows me to identify which
volumen  element (tetrahedral)  belongs each side element of "Physical
Surface".  Is there such command in Gmsh?  Or should I create a separate
routine that identifies them?

I send herewith the file *.geo and the first mesh saved.

Thank you in advance.
Best Regards,
Catalina

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