[Gmsh] Preventing gmsh from adding additional edges to pre-triangulated volume surfaces during volume tetrahedrization

[Christophe Geuzaine]

Knell, Sascha wrote:
> Hi,
> 
>  
> 
> I intend using gmsh to mesh polygranular geometries. A sample .geo file 
> is attached to this e-mail. To reduce its size, the majority of grains 
> were deleted. If this sample geometry is meshed with tetrahedrons, some 
> additional edges are inserted in the pre-triangulated grain surfaces. Is 
> there a way preventing this? 

Only with the Frontal (Netgen) algorithm. The Delaunay cannot guarantee
that no new edges will be created on the surfaces.

> The 'Transfinite Line "*" = 2' option seems 
> to have no effect on the 3D mesh generation. If it is not possible 
> avoiding these additional edges, is a consistent mesh guaranteed between 
> different grains, if these grains share a common pre-triangulated surface?

Yes.



> 
>  
> 
> Thanks in advance.
> 
>  
> 
> Best regards
> 
>  
> 
> Sascha Knell
> 
> 
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> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine