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How to create such hybrid 2D mesh with triangles and quadrilaterals?

The question is pretty much the title.

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In order to test some novel ideas on fluid-solid interaction, I am developing a two-dimensional CFD code using uniform, and non-uniform 2D mesh imported by Gmsh. By running some test cases in SU2-CFD, I found this type of mesh is so elegant, can somebody tell me which open-source software of library can produce this mesh?

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