Diverge on Cyclic ABL Simulation -- CFD Online Discussion Forums

March 24, 2020, 19:23	Diverge on Cyclic ABL Simulation	#1
Sereff Member Sereff Join Date: Jan 2019 Posts: 49 Rep Power: 7	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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