[Gmsh] Overlapping elements in 2D mesh

Christophe Geuzaine cgeuzaine at ulg.ac.be
Mon Feb 5 14:28:50 CET 2007

Min Yan wrote:
> Dear all,
> I have noticed the 2D algorithm in Gmsh (version 1.65) sometimes 
> generates a couple of weired elements at certain mesh positions, 
> primarily near to the material interface. In simple words, some of the 
> triangles are overlapping. Attached are two samples. Such meshes can be 
> displayed without any problem. It however fails my eigensolver from 
> converging. Any clue?
> Additional parameters:
> Mesh.Algorithm=1;
> Mesh.Smoothing=6;
> Mesh.RenumberNodes=1;
> And I compiled with second-order element switch.
> I have also tried to use Mesh.Algorithm=3. It does not seem to have such 
> problem. However, I have not figured out how to make the output mesh by 
> Triangle look as good as that generated by Algorithm 1.

Can you give the new version 2.0 a try? It should be more robust in that

> Thanks.
> Min Yan
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science