# OpenFOAM

OpenFOAM is a popular engineering application toolbox. It's open source and is used for simulating fluid flow around objects.

# Workflow

# Installing OpenFOAM with Gridware

  • Create a gridware software environment:
[flight@chead1 (mycluster1) ~]$ flight env create gridware
  • Activate the environment:
[flight@chead1 (mycluster1) ~]$ flight env activate gridware
  • Locate available OpenFOAM versions:
<gridware> [flight@chead1 (mycluster1) ~]$ gridware search openfoam
  • Install OpenFOAM 4.1:
<gridware> [flight@chead1 (mycluster1) ~]$ gridware install apps/openfoam/4.1

# Checking OpenFOAM is Working

  • Load the OpenFOAM module:
<gridware> [flight@chead1 (mycluster1) ~]$ module load apps/openfoam
  • Check an OpenFOAM command can be seen by viewing the help page:
<gridware> [flight@chead1 (mycluster1) ~]$ icoFoam -help

# Running a Simple OpenFOAM Job

  • Create a job script in the current working directory:
<gridware> [flight@chead1 (mycluster1) ~]$ cat << 'EOF' > myfoamjob.sh

# Activate environment and load OpenFOAM module
flight env activate gridware
module load apps/openfoam

# Create job directory from example job
cp -r $FOAM_TUTORIALS/incompressible/icoFoam/cavity/cavity $HOME/.
cd $HOME/cavity

# Calculate fluid pressure with OpenFOAM tools
  • Submit the job to the queue system:
<gridware> [flight@chead1 (mycluster1) ~]$ sbatch myfoamjob.sh
  • Check that the job is running (iit will take 1-2 minutes to complete):
<gridware> [flight@chead1 (mycluster1) ~]$ squeue

# Viewing the Results

Once the cavity job has finished running, the results can be visualised through a desktop session.

  • Connect to VNC desktop (For more information on launching desktops, see the Flight Desktop section).
  • In a terminal on the desktop session, ensure that the OpenFOAM module is loaded:
[flight@chead1 (mycluster1) ~]$ flight env activate gridware
<gridware> [flight@chead1 (mycluster1) ~]$ module load apps/openfoam
  • Navigate to the cavity directory and launch the paraFoam viewer:
<gridware> [flight@chead1 (mycluster1) ~]$ cd cavity
<gridware> [flight@chead1 (mycluster1) cavity]$ paraFoam
  • In the window that opens, scroll down to "Mesh parts" and select all the boxes, then click apply

  • Next, change the display to 'U' in the dropdown menu, click play to change the timestamp and then click and drag to rotate the subject