Anisotropic mesh refinement

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Anisotropic mesh refinement

Renato Poli

I need to refine a 2D triangular mesh in an anisotropic way.
Triangles end up with a high aspect ratio, following a fracture path.
Please see an example I made manually, without refinement.

I tried some pre-transformations + refine, but I could not get proper control of the CDT on a very deformed mesh.

Any idea?