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[blockMesh] Parallel meshing strategy of a (very) simple case

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Old   September 7, 2021, 11:54
Question Parallel meshing strategy of a (very) simple case
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Thibault XAVIER
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Hi all !


It's the first time for me on the forum.



I have a quite simple problem to solve.



I would like to set up a simple OpenFOAM case described by a cube. But I need to :

- 1* have a linear mesh refinement in one direction (as the simpleGrading option of blockMesh could do)
- 2* create a huge case with a billion of element, supposed to be ran on supercomputer.


My problem : the usual workflow (blockMesh, decomposePar) could work by using fat node on supercomputer, but can take hours and hours to perform, and sometimes hit the allowed job-time limit of supercomputer.



What would be your strategy if you wanted to perform this "simple" case set-up in parallel ? I though about creating coarse mesh, decompose it and then refine it using refineMesh, but it seems i can't control the mesh grading the way i would like (condition 1*).
(Extra-bonus question : is it mandatory to have a repertory for each MPI-process ?)


Thanks for your great help !


Thibault
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Old   September 9, 2021, 05:56
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Cyrille Bonamy
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Hi Thibault,

Have you tried the following command?

mpirun -np XXX redistributePar -decompose -parallel

doc : https://www.openfoam.com/documentati...-parallel.html
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