[Gmsh] Second Order Elements on Curved Surfaces
Christophe Geuzaine
christophe.geuzaine at case.edu
Wed Jun 21 08:41:51 CEST 2006
Jacques Kools wrote:
> Hallo Christophe,
>
>
>
> Hope you are doing fine. I had a question about generating second order
> triangles on curved surfaces (something like sphere.geo in the demo
> section is perfect to demonstrate). I noted that the mid-edge nodes are
> located on the geometrical surface rather than on the triangles, i.e.
> they are not really mid-edge. If you then do a 3D mesh, you get tets
> that are not really tets near the surface. I hope I make myself clear.
>
>
>
> I understand that this is a desirable feature for some people, but for
> the particular application we have in mind, we would rather have higher
> order tets and tris where the mid-edge points are really halfway between
> the vertices. Would it be possible to have the option to generate such
> elements? Don’t worry if it is too much of a hassle, it would be quite
> easy for us to generate the additional points when reading the mesh.
>
Hi Jacques - we could indeed add an option to simply subdivide the
edges/faces instead of generating the new vertices on the geometry. I'll
add this to our TODO list.
>
>
> I also noted that applying “optimize quality” on a second order mesh
> generates again a first order mesh.
>
Yes, that's due to the way the optimizer works. The best is to optimize
the mesh first, then create the 2nd order nodes.
Take care,
Christophe
>
>
> Hope this is useful,
>
>
>
> Jacques Kools
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> gmsh mailing list
> gmsh at geuz.org
> http://www.geuz.org/mailman/listinfo/gmsh
--
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine