How to extract all exterior boundary elements from a 3D given non-confirming mfem mesh

[xujiangping]

How to extract all exterior boundary elements from a 3D given non-confirming mfem mesh

[xujiangping]

Thanks for your suggestion! I will try it.

[tzanio]

Can you clarify what are you trying to do?

In particular are those "exterior boundary elements" the 6 faces of the hexahedron and what computations you need to perform with them?

Tzanio

[xujiangping]

I want to perform heat conduction of the 3D object (see the meshes in the uploaded figure). Its exterior boundry contacts with other object (the one in pink).

[xujiangping]

[tzanio]

If those boundary elements are marked with a specific attribute in the mesh file then you can use that attribute in MFEM to e.g. impose boundary conditions or extract the surface as a submesh.