[Gmsh] Physical Surface of a part of a surface

[Lakshmi Selvakumaran]

Hi,

I  have a 3D mesh and want to assign part of the surface to a physical
surface with a specific label.  But it seems that I have to modify the
whole geometry to include this surface and it looks like I have to redo the
whole geometry again.  Is it possible to assign a part of a surface as a
physical mesh without having to create this subsurface explicitly and
re-meshing everything around it?

Thanks.

Best regards
Lakshmi.

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