RE: [Libmesh-users] adaptive refinements with linear elements

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

On Thu, 17 Feb 2005, KIRK, BENJAMIN (JSC-EG) (NASA) wrote:

> a non-refined element the refined elements degrees-of-freedom are
> constrained in terms of the non-refined elements DOFs.  What is happening in
> this case is the refined elements matrix contributions are being aliased
> back to the non-refined element (as well they should).  However, they never
> get constrained out as you would like them to because of the
> element-by-element BC application process.

Should that be happening in a 2D code with Lagrange elements?  It
seems like any constrained nodes in that case should be interior
nodes.

> I have envisioned another set of DOF constraints that basically impose
> dirichlet values.  I'll work on that over the weekend and hopefully get you
> something to try next week.

Would you describe the method you're implementing?  I'd like something
which could be generalized to non-Lagrange elements or fourth order
problems if possible... of course, I don't know if that is possible
at all, but maybe hearing your ideas would give me a few.
---
Roy