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[snappyHexMesh] Order of snappyHexMesh and decomposePar

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Old   October 20, 2014, 09:29
Question Order of snappyHexMesh and decomposePar
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Litao
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Hi FOAMers,

I have this question in my mind, but haven't figure out answer yet, so please help me.

Say if I have a geometry needs to be decomposed into 8 processor sub-domains, and I'm just curious if the order of running 'snappyHexMesh' and 'decomposePar' would make any difference on the mesh.

I image that if I decompose the domain first, then the mesh has to align itself with the separating boundary faces/lines; and if I do snappyHexMesh first, the decomposePar will take place based on the orthogonal or other criteria?

I'm not sure if this is correct, and which way is the best to give the better mesh, so FOAMers, please advice, thanks!

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Old   November 11, 2018, 05:15
Default You should run decomposePar before snappyHexMesh
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So the snappyHexMesh will also run in parallel.
The snappyHexMesh will move cells from one processor to another in order make the number of cells almost the same.
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