How to restart a coupled OpenFOAM–CalculiX FSI simulation with preCICE?

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I am running a coupled OpenFOAM–CalculiX FSI simulation on an HPC cluster. Since the simulation is computationally expensive, it takes several weeks to complete. However, due to cluster job time limits, I can only run jobs for a maximum of one week at a time.

In OpenFOAM, I can easily resume the simulation from the latest time step by setting startFrom latestTime in the controlDict. However, I am not sure how to properly resume the simulation on the CalculiX side.

How can I restart or continue a coupled OpenFOAM–CalculiX simulation (with preCICE) after a job interruption? Specifically:

  • Is there a way to restart CalculiX from a previous state?

  • What changes (if any) are required in the CalculiX input files?

  • How should the restart be handled to ensure consistency with preCICE coupling?

Any guidance or best practices would be greatly appreciated.

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Hi @Roham,

I started documenting this at some point, based on some other resources:

If you could directly try things out and comment in the PR, it would be great to make some progress on it together. This is something that many users have asked.

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OK, I am working on it, and if it works, I will explain the solution.