<div>Dear all,</div>
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<div>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?
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<div>Additional parameters:</div>
<div>Mesh.Algorithm=1;<br>Mesh.Smoothing=6;<br>Mesh.RenumberNodes=1;</div>
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<div>And I compiled with second-order element switch.<br> </div>
<div>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. </div>
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<div>Thanks.</div>
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<div>Min Yan</div>