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Stopping OpenFOAM on low timestep?

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Old   August 2, 2014, 10:59
Default Stopping OpenFOAM on low timestep?
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Galen Gisler
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Is there a flag that can cause OpenFOAM to stop cleanly if the timestep goes below a certain value?

I am running interDyMFoam (from OF 2.3.0) in 2d. I have an oddly shaped object defined with snappyHexMesh moving through a two-phase domain. The cells in front of the object get very small, and the adjustable timestep therefore plunges. Eventually the calculation grinds to a halt, but it can run for several hours without making progress. I would like to be able to detect this situation and halt the run so I don't wast cycles.

I tried putting a minDeltaT into my controlDict, but this had no effect.

Any advice would be appreciated.

Alternatively, and this I would prefer, is to find a way to combine very small cells into larger cells, but I haven't found the right trick to use both dynamicMotionSolverFvMesh and dynamicRefineFvMesh in the same calculation. If anyone else has done this successfully, please advise!

Thanks -
Galen Gisler
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dynamicmesh, snappyhexmesh 2d

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