Convert `Allrun` into Python Commands for Multi-Node Execution

With Inductiva, running your simulations on a multi-node MPI (Message Passing Interface) cluster is as straightforward as using any single-node option. However, before proceding, there is one important step: you need to convert your Allrun script into Python commands.

To fully leverage MPI clusters, you cannot use the shell_script argument as you might with OpenFOAM simulations. Instead, you must use the commands argument, which accepts a list of commands to be executed during the simulation. Some commands will run sequentially, while others may run in parallel.

Converting your Allrun script into a list of commands is simple: extract each command from the script, excluding any logic or flow control, and place them as individual strings inside a Python list.

To illustrate, consider this shell snippet:

echo -e -n '\n    Running snappyHexMesh ...\n'
(
    cd system
    cp controlDict.SHM controlDict
    cp fvSchemes.SHM fvSchemes
    cp fvSolution.SHM fvSolution
    cd ..
)

This would become the following in Python:

commands = [
    # You can also add the echo if you wanted
    "cp system/controlDict.SHM system/controlDict",
    "cp system/fvSchemes.SHM system/fvSchemes",
    "cp system/fvSolution.SHM system/fvSolution",
]

⚠️ Important Notes

• Each command must be independent. You cannot use cd to change directories between commands.
• Remove any logic such as conditionals or loops.
• Special characters like >, |, and & are not allowed.