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OpenFOAM: Difference between revisions
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===Usage=== | ===Usage=== | ||
OpenFOAM requires substantial preparation of your environment. In order to run OpenFOAM commands (such as <code>paraFoam</code>, <code>blockMesh</code>, etc), you must load a [[Using modules| modulefile]] | OpenFOAM requires substantial preparation of your environment. In order to run OpenFOAM commands (such as <code>paraFoam</code>, <code>blockMesh</code>, etc), you must load a [[Using modules| modulefile]]. | ||
Here is an example of a serial submission script for OpenFOAM 5.0: | Here is an example of a serial submission script for OpenFOAM 5.0: | ||
{{File | |||
|name=submit.sh | |||
|lang="bash" | |||
|contents= | |||
#!/bin/bash | #!/bin/bash | ||
#SBATCH --time=00:01:00 | #SBATCH --time=00:01:00 | ||
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module purge | module purge | ||
module load openfoam/5.0 | module load openfoam/5.0 | ||
blockMesh | blockMesh | ||
icoFoam | icoFoam | ||
}} | |||
Here is an example of a parallel submission script: | Here is an example of a parallel submission script: | ||
{{File | |||
|name=submit.sh | |||
|lang="bash" | |||
|contents= | |||
#!/bin/bash | #!/bin/bash | ||
#SBATCH --account=def-someuser | #SBATCH --account=def-someuser | ||
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module purge | module purge | ||
module load openfoam/5.0 | module load openfoam/5.0 | ||
decomposePar | decomposePar | ||
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setFields | setFields | ||
srun interFoam -parallel | srun interFoam -parallel | ||
}} | |||
Mesh preparation (<code>blockMesh</code>) may be fast enough to be done at the command line (see [[Running jobs]]). The solver (<code>icoFoam</code> and others) is usually the most expensive step and should always be submitted as a Slurm job except in very small test cases or tutorials. | Mesh preparation (<code>blockMesh</code>) may be fast enough to be done at the command line (see [[Running jobs]]). The solver (<code>icoFoam</code> and others) is usually the most expensive step and should always be submitted as a Slurm job except in very small test cases or tutorials. | ||
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===Performance=== | ===Performance=== | ||
OpenFOAM can emit a lot of debugging information in very frequent small writes (e.g. hundreds per second). This may lead to poor performance on our network file systems. If you are in stable production and don't need the debug output, you can reduce or disable it with: | OpenFOAM can emit a lot of debugging information in very frequent small writes (e.g. hundreds per second). This may lead to poor performance on our network file systems. If you are in stable production and don't need the debug output, you can reduce or disable it with: | ||
{{Commands | |||
|mkdir -p $HOME/.OpenFOAM/$WM_PROJECT_VERSION | |||
|cp $WM_PROJECT_DIR/etc/controlDict $HOME/.OpenFOAM/$WM_PROJECT_VERSION/ | |||
}} | |||
Then edit the <code>debugSwitches</code> dictionary in <code>$HOME/.OpenFOAM/$WM_PROJECT_VERSION/controlDict</code>, changing flags from values >0 to 0. ''(Contribution from C. Lane)'' | Then edit the <code>debugSwitches</code> dictionary in <code>$HOME/.OpenFOAM/$WM_PROJECT_VERSION/controlDict</code>, changing flags from values >0 to 0. ''(Contribution from C. Lane)'' | ||
</translate> | </translate> | ||