[Gmsh] surface mesh, connect the faces of a compound

[Bernd Hahnebach]

Hi David,

thanks for the fast reply. It is what I would like to have connect the  
faces if they share an edge. Yes the provided option seams to do the  
trick.

-string "Geometry.OCCSewFaces=1;"

It worked on the simple provided part compound_of_faces.step and on  
one with 10 faces beam-10faces.step. With bothe the FEA worked out  
very well :-) On a more sophisticated part mechanical-part.step it  
seam to work out too but I get non positive jacobian during FEA, but  
that seams to be another part of the story.

Downloadlink is still:
https://cloud.woelkli.com/public.php?service=files&t=1cfd13febed7694726b902cdb36476d4

I need to test on more examples. I will report back.

kind regards bernd




Zitat von David Colignon <david.colignon at ulg.ac.be>:

>
> Hi Bernd,
>
> can you try with adding	the
>
> -string "Geometry.OCCSewFaces=1;"
>
> option ?
>
> This should work with relatively simple geometries, i.e. faces  
> sharing a common line.
>
> Regards,
>
> Dave
>
> -- 
> David Colignon, Ph.D.
> 1er logisticien de recherche
> Université de Liège
> ACE - Applied & Computational Electromagnetics
> Sart-Tilman B28
> 10, Grande Traverse
> 4000 Liège - BELGIQUE
> Tél: +32 (0)4 366 37 32
> http://www.ulg.ac.be/nic4
>
> On 21/09/15 19:25, Bernd Hahnebach wrote:
>> Hi there,
>>
>> This is my first post to the mailing list so I may introduce myself  
>> first. The "identifier" given to
>> me by my parents is Bernd and this corresponds to what most people  
>> call myself. The bred to feed
>> myself an my familiy I earn in an engineering office near Zuerich  
>> in Switzerland. I'm structural
>> engineer in the building industry. In my spare time I develop on  
>> the FEM Workbench and on the Arch
>> Workbench of the parametric open source cad plattform FreeCAD. This  
>> is why I'm gone write to this list.
>>
>>
>> FreeCAD uses for internal parametric surface and solid meshing  
>> netgen. AFAIK due to licence
>> incompatibility between FreeCAD and GMSH it has never been an  
>> option to use GMSH instead. But there
>> exists a FreeCAD macro which uses the GMSH installed on ones  
>> computer for meshing. Most users mainly
>> use this GMSH macro for meshing their models including myself. The  
>> macro exports a *.step meshes
>> with GMSH and imports the *.unv mesh back into FreeCAD. Babbled  
>> enought,the important part of the
>> post ...
>>
>>
>> I run into trouble with meshing compunds of faces. The faces where  
>> not connected to each other and
>> thus a Finite Element Analysis will fail to work without manual  
>> connection off all the faces of the
>> compund. As a example a very simple compund of just two faces is taken.
>>
>> mesh command:
>> gmsh compound_of_faces.step -3 -format unv -o compound_of_faces.unv  
>> -algo netgen -clmax 100,00
>> -order 2 -optimize
>>
>> gmsh --version
>> 2.8.5
>> on Debian Jesie
>>
>> I was wondering if it is possible to tell GMSH to mesh a connected  
>> Surface Mesh of a compund of faces?
>>
>> The files could be downloaded here:
>> https://cloud.woelkli.com/public.php?service=files&t=1cfd13febed7694726b902cdb36476d4
>>
>>
>> Kind Regards and thanks to all people who have ever contributed to  
>> GMSH development.
>>
>> Bernd
>>
>>
>>
>> _______________________________________________
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>