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How to make an O-type 2D mesh

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Old   December 31, 2021, 12:33
Default How to make an O-type 2D mesh
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Christian Arbace
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Hello Everyone, I'm new to Ansys and I'm trying to reproduce the enclosed mesh
(Source:Transition on a flat plate with a semi-circular leading edge under uniform and positive shear free-stream flow A. Palikaras, K. Yakinthos, A. Goulas)

I don't understand how to obtain that kind of curvature while maintaining the rectangular outer walls.
I tried to split the domain with 2 lines in the direction of the diagonals and then sizing, but the result isn't quite the same.
Thank everyone in advance for a response
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beginners, circular domain, fluent, mesh 2d, meshing 2d

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