Importing a hollow cone with physical group names to FEniCSx

General
1

Hi,

I’m trying to import a hollow cone geometry into FEniCSx. I generated the mesh in Gmsh, defined the physical groups (including the base and top surfaces), and exported it as a .msh file. However, after converting it to .xdmf, the physical groups seem to be lost in the resulting file.

Is it possible to create a hollow cone directly in FEniCSx, or should I fix this issue in Gmsh? Could you please guide me on how to preserve the physical groups during the conversion process?

Thank you!

2

Could you please explain how you generated the .msh file?
DOLFINx has a direct interface to GMSH through: dolfinx.io.gmsh:

(read_from_msh: dolfinx.io.gmsh — DOLFINx 0.10.0.post0 documentation)

3

Thank you for your response, and sharing the link. I generated mesh (for a hollow cone) directly in Gmsh and saved it as a .msh file. Then I used the following commands:

import meshio
mesh = meshio.read(“mesh_file.msh”)
meshio.write(“file_name.xdmf”, mesh)

It successfully converted the .msh file to .xdmf, but the output didn’t include the facet information and used TopologyType="Mixed". As a result, I got an error due to the mixed mesh type.

4

This is covered in many tutorials, including: Defining subdomains for different materials — FEniCSx tutorial

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