[Gmsh] Overlapping elements in 2D mesh

[Min Yan]

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.

Thanks.

Min Yan
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