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[snappyHexMesh] OF SHM surfaceMeshExtract leads to non manifold stl

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Old   May 5, 2022, 09:05
Default OF SHM surfaceMeshExtract leads to non manifold stl
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I am using OpenFOAM v2112.
I would like to extract a stl from a surface patch nicely meshed with snappyHexMesh. So I use the 'surfaceMeshExtract' (previously 'surfaceMeshTriangulate') utility (see here)

However, despite the surface could be very well refined, it's ended systematically as made of multiple manifolds.

How to constraint this to get a single manifold surface ?

Many thanks in advance for any help.
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