I would like to add support for Exodus's SHELL elements to libMesh, e.g.
TRISHELL3 and SHELL4. See the attached figure from the Exodus standard for
a picture of a SHELL4 element.
As you can see from the figure, the only difference here is that this
element has sidesets associated with the 2D faces as well as with the 1D
sides. This is useful when imposing loads on shell models, e.g. it allows
one to use Exodus sidesets (i.e. boundary_ids in libMesh) to impose surface
loads instead of Exodus blocks (i.e. subdomain_ids in libMesh).
In order to support this, I think we'd need to change BoundaryInfo so that
we can get boundary_ids from an element (as opposed to only a side or node
of an element). Before I dive into working on this, I wanted to check if
others agree if this is the right approach, and if it makes sense to add it
to libMesh?
David
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