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[snappyHexMesh] snappyhexmesh doesn't creat mesh in parallel issue?

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Old   March 1, 2015, 10:13
Default snappyhexmesh doesn't creat mesh in parallel issue?
  #1
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Klaus
Join Date: Mar 2009
Posts: 183
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Hello,

I'd like to speedup meshing with snappyhexmesh. Everything works fine, when I run it on one core but my i7 offers "8" so let's make use of them.

I had a look at the motorbike case, used the decomposepardict... there are no errors but snappyhexmesh doesn't create a mesh.

Where's the error?

This is my Allmesh script:

#!/bin/sh

# Determine OpenFOAM version
OF_MAJOR=`echo $WM_PROJECT_VERSION | cut -d'.' -f1`
OF_MINOR=`echo $WM_PROJECT_VERSION | cut -d'.' -f2`

# Source tutorial run functions
. $WM_PROJECT_DIR/bin/tools/RunFunctions

# Set variable to distinguish between OF 2.2 and older versions
if [ $OF_MAJOR -le 2 -a $OF_MINOR -le 1 ]; then
OLD=1
else
OLD=0
fi


## Make 3D mesh in slab of cells.
cd airfoil_snappyHexMesh
runApplication blockMesh > output/1-blockMesh.log 2>&1

if [ $OLD -eq "1" ]; then
runApplication surfaceFeatureExtract -includedAngle 150 -writeObj constant/triSurface/airfoil.stl airfoil > output/2-surfaceFeatureExtract.log 2>&1
else
runApplication surfaceFeatureExtract > output/2-surfaceFeatureExtract.log 2>&1
fi


# THIS WORKS
# running snappyhexmesh on one core of the i7 processor
#runApplication snappyHexMesh -overwrite > output/3-snappyHexMesh.log 2>&1
#rm -f 0/*

# THIS DOESN'T WORK
# running snappyhexmesh on 8 cores of the i7 processor
runApplication decomposePar
runParallel snappyHexMesh 8 -overwrite > output/3-snappyHexMesh.log 2>&1
rm -f 0/*
runApplication reconstructParMesh -constant


This is my decomposepardict:

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object decomposeParDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

numberOfSubdomains 8;

method hierarchical;
//method ptscotch;

simpleCoeffs
{
n (4 2 1);
delta 0.001;
}

hierarchicalCoeffs
{
n (4 2 1);
delta 0.001;
order xyz;
}

manualCoeffs
{
dataFile "cellDecomposition";
}


// ************************************************** *********************** //
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Old   March 7, 2015, 12:55
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Pascal Balz
Join Date: Feb 2015
Location: Germany
Posts: 44
Rep Power: 7
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Hi Klaus,

if your problem is still present, try the following code:
Code:
runApplication decomposePar
foamJob -parallel -screen snappyHexMesh
reconstructParMesh -latestTime
This works fine for me.
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