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oscillation in steady state

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Old   August 8, 2008, 02:30
Default oscillation in steady state
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I'm simulating a flow around a barge using steady state setting. However, when I plot the force, it oscillates (600 iterations, maybe more? But the force seems to fluctuates constantly). Does this means that I have a transient motions, e.g. vortex shedding? Or there is more to it?
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Old   August 8, 2008, 13:13
Default Re: oscillation in steady state
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For steady cylinder flow, I know my solution is as converged as position when my residuals start oscillationing about a steady datum. For cylinder flow, that's all vortex shedding, even though I'm running steady state.

I don't know what your barge looks like, but it's not a bad first guess to think that vortex shedding could be causing that force fluctuation.

Just curious, along what line are you plotting force on the barge?
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Old   April 30, 2012, 11:44
Default oscillation of Ct
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I'm doing a calculation on a ship in steady state with a multi-phase VOF wave. I'm also experiencing som fluctuation in the Ct value. I don't know why this happens?
I would bemuch obliged if someone could answer this question.
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