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[snappyHexMesh] Modelling Rotor: To use MergeMeshes or not?

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Old   September 21, 2023, 06:45
Default Modelling Rotor: To use MergeMeshes or not?
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Niall O'Neill
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Hello, I am modelling a wind turbine rotor and am trying to figure out the best way to do it.

For now I am using snappyHexMesh and am having significant difficulties getting a good snap quality. I have seen some examples where people create a mesh of the rotating region and a mesh of the non rotating region, and then merge the meshes after. Is this a good practice?

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Old   September 25, 2023, 04:48
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It is what I usually do when I am not satisfied with snappyHexMesh. Make sure that the coupled patches match pretty well, and don't forget to change the boundary file to create the ACMIs once the meshes are merged together.
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Old   September 25, 2023, 08:00
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my 2 cents:
When not using overset mesh, having stationary and rotating parts in the same model usually requires using different meshes and coupling through interfaces. So, what Alczem already states, plus I'd like to point out, that ACMI interfaces are not mass-conservative. has introduced a new interface algorithm called NCC which is mass-conservative and replaced ACMI in the recent releases:
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