blockMesh
surfaceFeatures
decomposePar -noZero
mpirun --np 12 snappyHexMesh -parallel -overwrite
reconstructParMesh -constant -noZero
sed -i 's/method          hierarchical;/method          scotch;/' system/decomposeParDict
decomposePar
mpirun -np 12 simpleFoam -parallel
reconstructPar
rm -rf processor*