Re: [Libmesh-users] Add variable to dof, that lives on surface

[Roy S. <roy...@ic...>]

On Wed, 23 Mar 2011, Joh...@un... wrote:

> I'd like to add a variable to a DofMap, that lives not on the whole
> mesh but only on its surface. Is subdomain the right thing, that
> should work or do I have to do something completely different?

I don't think we support this with fully-coupled solves right now.
Per-subdomain variables work if you want a variable that only lives on
a subset of the interior.  If you want a loosely coupled variable that
only lives on a surface then you create a BoundaryMesh and create a
separate system on it.  But we don't have any way to solve such
variables in the same (non)linear System as the interior Mesh
equations.

I don't think there's anything in the libMesh architecture that would
*prevent* adding such a capability, but the addition would require
some serious library internal changes.
---
Roy