This tutorial walks through analysing a velocity field using Helmholtz decomposition with coarse-graining.

The generated data here is very low resolution (2-degree grid spacing), but runs in ~5 minutes on a single processor.

1. First, compile Helmholtz_projection.x and coarse_grain_helmholtz.x and copy them into this directory
2. Run the run_all_steps.sh script (./run_all_steps.sh)
3. Afterwards, you can run the jupyter notebook to analyse the results.

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There is a known issue where the python scripts that run after calling coarse_grain_helmholtz.x in the run_all_steps.sh script fail to run withour printing an error. If the coarse-graining successfully runs (i.e. directory outputs is created and populated with postprocessing_*.nc files) but the RESULTS_*.nc files are not created, then you will need to manually call the three python scripts listed at the end of run_all_steps.sh script.

When compiling the executables, set the constants.hpp with the provided file.