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[Other] polyDualMesh + Layers + cfMesh/improveMeshQuality = usable polyMeshes witH BLayer

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Old   September 18, 2019, 05:56
Default polyDualMesh + Layers + cfMesh/improveMeshQuality = usable polyMeshes witH BLayer
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Ferdinand Pfender
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Hi everyone,

i was trying a lot with polyDualMesh in combination with Netgen Meshes generated in Salome.

As most of us know already, polyDualMesh messes up with boundary Layers in Netgen Meshes and generates wrong oriented Faces, which makes the mesh unusable.

It seems, that it is possible to correct this wrong Faces with the cfMesh Tool "improveMeshQuality", to generate pretty suitable Polymeshes with Boundary Layers.

the procedure is as follows:

- create netgen Mesh with Layers (Use your favourite Tool)
- polyDualMesh -concaveMultiCells <angle>
- combinePatchFaces <angle>
- improveMeshQuality


Thats it! Have fun!

Best Wishes, FerdiFuchs
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Last edited by FerdiFuchs; September 18, 2019 at 11:41.
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Old   May 8, 2020, 17:05
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Lilian Chabannes
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Very good stuff thanks!

Any additional tips for boundary layer generation in SALOME? It messes things up for me most of the time.
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Old   February 11, 2022, 10:27
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Jost Kemper
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Thanks Fredi!


Your approach really does produce usable poly meshes!
I have experimented a bit with creating the prism layers with snappyHexMesh as a final step to the process (i.e. after using improveMeshQuality).
It works quite nicely so far.

Cheers,
Jost
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Old   May 25, 2022, 07:17
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Hello Ferdi, Hello Jost.

First of all, thanks to Ferdi. This helped me to create the first meshes with PolyDualMesh. However, I always had the problem with the boundary layers. With "ImproveMeshQuality" I always had the problem that the layers were "pulled out" of the corners. See picture in the attachment.

I think the idea of creating the layers afterwards is great, thanks Jost. But with SnappyHexMesh I always have the problem that the layers are not created correctly. If I get a "thickness" of the layers of 70% with Snappy, then I am usually super happy. Layer generation with cfmesh works much better.



So why do you use snappyHexMesh for layer generation?

You can also use the cfmesh command "generateBoundaryLayers" to create layers with cfmesh only. I am currently doing my first tests with this method and the first results look very good.
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File Type: jpg TetraMesh.jpg (190.0 KB, 113 views)
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