[Gmsh] Compound surfaces and lines

[Martin Kraska]

Hi Christophe,

Thanks for the hint. I can indeed create a mesh with compound surfaces in 2.13.1. I observed some restrictions:

- the midside nodes of the generated elements don't follow the compound surface (except on the edges of the surface).
- Successful meshing relies on introduction of an upper element size limit
- If I also combine the adjacent lines in order to get rid of the short edges (they still attract small elements), then 3D meshing fails. 

The console complains about intersecting surfaces.

Also, switching on all geometry healing options and setting a high geometry tolerance does not remove the small edges.

Martin

> 
>   1. Re: Gmsh crash (Christophe Geuzaine)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sat, 16 Jul 2016 22:44:23 +0200
> From: Christophe Geuzaine <cgeuzaine at ulg.ac.be>
> To: gmsh at onelab.info
> Subject: Re: [Gmsh] Gmsh crash
> Message-ID: <42CDB7BE-5537-4658-8DE2-B90A2D3C4B17 at ulg.ac.be>
> Content-Type: text/plain; charset=us-ascii
> 
> 
> Hi Martin,
> 
> Give 2.13.1 a try: the issue is that compounds cannot currently be meshed
> high-order (this will be supported with the new compound implementation in Gmsh
> 3.0); also, the error message was misleading.
> 
> Christophe
> 
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