[Gmsh] get good quality of mesh at corner

[王学敏]

Dear gmsh user,
I just start to learn gmsh, I can not good quality of mesh. The geometry is
not difficult, but I can not get good mesh on the surface, especially at
corner. Does anyone help me get good mesh in such geometry. Attachments are
the files needed to get mesh. Thank you so much.
Best regards,
Xuemin
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