[Gmsh] mesh morphing

Bob Flandard bflandard at gmail.com
Tue Apr 23 19:33:35 CEST 2019

Hello Christophe,

Thanks for the suggestion. Having experimented with it a bit, I've
concluded that it was probably a naive question I asked, because it is very
easy to collapse a tet element into a state where it has a negative or
inverted volume. It takes an unreasonably high quality mesh to avoid this
in at least a few of the elements of any realistic mesh (not a toy model).

All the best, Bob

On Mon, 22 Apr 2019 at 20:01, Christophe Geuzaine <cgeuzaine at uliege.be>

> > On 12 Apr 2019, at 12:27, Bob Flandard <bflandard at gmail.com> wrote:
> >
> > Hello Gmshers,
> >
> > Does Gmsh have the capability to do mesh morphing on a tetrahedral mesh?
> >
> > To explain a bit more detail, the topology of the morphed mesh would be
> unchanged from the initial mesh, but rather than specifying a field of
> displacements for all nodes (like the WARP plugin), only a subset of nodes
> would have prescribed displacements and Gmsh would then calculate new node
> coordinates for all other nodes that gave some kind of globally averaged
> minimum element distortion.
> >
> I think you should be able to quite easily get what you want using the api.
> Christophe
> > For example, a prismatic bar contained within some surrounding air, is
> rotated about its centroid (not so much that it penetrates the surrounding
> air). In the morphed mesh the relative displacement of nodes within the bar
> would be zero and the displacement of nodes on the exterior of the
> surrounding air would be zero, but all other nodes would in general move
> relative to each other to create nicely shaped elements. Something like
> that.
> >
> > Thanks for your help, Bob
> > _______________________________________________
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> > gmsh at onelab.info
> > http://onelab.info/mailman/listinfo/gmsh
>> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
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