[petsc-users] Multi-physics meshes with PETSc DM?

[Andrew Ho]

>
> 1) I don't use Physical Groups from GMsh since its unclear how this would
> be reflected in the discretization


If I'm not using physical groups in GMsh, how do I easily denote what part
of the domain should be handled with which physics? I would like to be able
to use the same code with similar but not identical meshes (for example to
do a convergence study), so manually iterating through a list of vertices
at the element height stratum in a chart doesn't provide any hints on which
subdomain an element is suppose to belong in.
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