On Thu, May 19, 2016 at 10:19 AM, David Knezevic <david.kneze...@akselos.com
> wrote:
> 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?
>
So once the elements are in libmesh, they will just be treated as TRI3 and
QUAD4 types?
You will have to look at and possibly take out the hacks I put in to work
around the issue where Cubit 14+ automatically writes TRISHELL elements for
TRI3 elements when dim==3 (search for "is_cubit14_plus" in
exodusII_io_helper.C). Actually, I don't know how you will differentiate
between the case where someone legitimately wanted a TRISHELL3 element and
where one was incorrectly written to the file by Cubit...
--
John
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