[Gmsh] Connecting structured to unstructured meshed volumes in 3D

[Christophe Geuzaine]

> On 5 Mar 2020, at 09:32, Octavio Castillo Reyes <ocastilloreyes at gmail.com> wrote:
> 
> Prof. Ghristophhe, thank you for your tip!
> 
> Right now I have tried it but I have obtained the following errors:
> 

Which version of Gmsh? It should work as-is with recent versions.

Christophe

> Error   : No elements in region 2 
> Info    : Done meshing 3D (0.005192 s)
> Info    : Optimizing 3D mesh...
> Info    : Optimizing volume 2
> Info    : Done optimizing 3D mesh (0.00019 s)
> Info    : 537 vertices 1236 elements
> Error   : ------------------------------
> Error   : Mesh generation error summary
> Error   :   104 warnings
> Error   :   105 errors
> Error   : Check the full log for details
> Error   : ------------------------------
> 
> In any case, this idea is very good. In spite of this, I would like to know if it is possible to replicate this case only with tetrahedra, in this way I can avoid using different base functions in my finite element code.
> 
> Best regards
> 
> O.
> 
> On Thu, Mar 5, 2020 at 9:19 AM Christophe Geuzaine <cgeuzaine at uliege.be> wrote:
> 
> 
> > On 3 Mar 2020, at 13:45, Octavio Castillo Reyes <ocastilloreyes at gmail.com> wrote:
> > 
> > Dear gmsh developers, 
> > 
> > I would like to know if it is possible build a tetrahedral mesh with following features: 
> > 
> > - structured tetrahedral  elements on boundaries
> > - unstructured tetrahedral elements inside the domain
> > 
> > Could you give some tips/ideas to build this kind of mesh (if possible).
> > 
> 
> I will be done automatically (with a pyramid layer to connect both). Here's an example:
> 
> https://gitlab.onelab.info/gmsh/gmsh/-/blob/master/benchmarks/extrude/hybrid_pyramids.geo
> 
> Christophe
> 
> 
> 
> > Best regards
> > 
> > O.
> > 
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> 
> — 
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science 
> http://www.montefiore.ulg.ac.be/~geuzaine
> 
> 
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine