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Parallel motorBike LES computing problem.

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Old   August 20, 2012, 10:57
Unhappy Parallel motorBike LES computing problem.
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Jie Chen
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I ran the pisoFoam LES motorBike tutorial case on the cluster. It worked fine. Using the default setup, this job finished in about 7 hours on 8 cores. However, after I change a few parameters, it gets stuck at the step pisoFoam for 32 cores.

Basically, I changed the decompose method in the decomposeParDict to be scotch and increased the numberofSubdomains to be 32. Then, changed a few lines of Allrun in the lesfiles folder to use the RAS solution from 8 cores as the initial condition and then ran LES on 32 cores.
///////////////////////////////////////////////////////////////////////////////////
runApplication reconstructParMesh -constant -mergeTol 1e-6

runApplication reconstructPar

rm -rf processor*

# Set-up the LES case
rm -rf 0/
mv 500/ 0/
rm -rf 0/uniform/

cp system/decomposeParDict.scotch system/decomposeParDict

runApplication decomposePar

cp ../lesFiles/fvS* ../lesFiles/controlDict system/
cp ../lesFiles/LESProperties ../lesFiles/turbulenceProperties constant/
cp ../lesFiles/nuSgs 0/

#ls -d processor* | xargs -i rm -rf ./{}/0/uniform $1

ls -d processor* | xargs -i cp ../lesFiles/LESProperties ./{}/constant/ $1
ls -d processor* | xargs -i cp ../lesFiles/turbulenceProperties ./{}/constant/ $1
ls -d processor* | xargs -i cp ../lesFiles/nuSgs ./{}/0/ $1


runParallel pisoFoam 32

runApplication reconstructParMesh -constant -mergeTol 1e-6

runApplication reconstructPar
///////////////////////////////////////////////////////////////////////////////////
I don't know what is wrong here. Can anybody help me?
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Old   August 22, 2012, 17:44
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Jie Chen
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I figured out this problem. The reason is just the different run environment on the cluster. I changed the script. Now, it works fine.
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