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Diverge on Cyclic ABL Simulation

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Old   March 24, 2020, 18:23
Default Diverge on Cyclic ABL Simulation
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Jeff Jansen
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Hi Foamers,

I was trying to run a LES simulation of neutral ABL on a cyclic domain (surface roughness 0.1m). I excited the velocity field with a DFSEM inlet and then set the inlet and outlet BC to be cyclic. To keep the flow running, fvOptions (meanVelocityForce, relaxation 0.5 included) was used, and here came the problem. The flow diverged. I read the output.log and it seems that in the first few steps the calculated pressure gradient calculated by fvOptions went crazy (ranging between 1e4 to -6e3). Have anyone ecountered this kind of behavior?

Kind regards,
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