Re: [Libmesh-users] Defining duplicate nodes on refinement

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

On Tue, 11 Sep 2018, Rossi, Simone wrote:

>> If you start with the 10 node mesh
>> on top and refine, then you will always have continuity of any C0 (or
>> C1) solution variables at the two shared domain corner nodes.
> This is what I would like to have. The idea is to introduce some random “cuts” in the mesh, where I can apply some boundary conditions.
> I thought the easiest way to achieve this would have been adding new duplicated nodes on the side using AMR.

Yeah, if that's the effect you want, then a single refinement followed
by duplicating the non-corner internal boundary nodes is exactly what
you want to do.

> Could I “break” the mesh, use AMR, and then stitch back the nodes together?

You could but it would be more of a pain.  Just do one refinement and
then break it afterward.  Or, actually, you could also use TRI6
instead of TRI3 and break the middle node between the two triangles.
---
Roy