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Resuming OpenFoam with different number of processors

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Old   May 2, 2014, 09:36
Default Resuming OpenFoam with different number of processors
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Hi everbody,

Is there a way to stop an OpenFoam execution and re-run it later with more processors? I've searched the forums and tried to use reconstructPar and redistributePar, but I've had trouble getting them to work. Could anybody provide more detailed steps on how to achieve this?

Any help would be greatly appreciated,

Thanks.
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Old   May 2, 2014, 12:18
Default restarting with MPU changes
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Jim Conger
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No guarantees, but what I would try would be:

1) At completion of first set of runs, run reconstructPar. This will reassemble the solution from all separated MPU runs into single directories - just as if you had run the whole problem on one CPU.
2) Delete the processorN directories
3) Make sure your controlDict file has "startFrom latestTime;" and an endTime greater than your last solution.
4) Restart the problem with a different number of processors by changing your MPU settings and then running decomposePar, mpirun, reconstructPar as usual.

I have only done this going from one to many to one processor.
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