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simpleFoam kOmegaSST k, w and nut initial and boundary values

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Old   December 6, 2021, 01:23
Default simpleFoam kOmegaSST k, w and nut initial and boundary values
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Ezel Bayraktar
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Hello Everyone,

I am trying to simulate flow over an airfoil using simpleFoam and turbulence model kOmegaSST. I have taken k, w and nut values from http://ichrome.com/blogs/archives/342 and http://www.wolfdynamics.com/tools.html?id=110. But after several iterations, soltion diverges. After changing these values many times, I have obtained a stable solution. My question is; how could we select values of these turbulence parameters.

with all respect...
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Old   December 6, 2021, 07:46
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For inlets, I'd use things like turbulentIntensityKineticEnergyInlet and turbulentMixingLengthFrequencyInlet - you give them an intensity/length scale, and they look at the velocity and calculate k/omega for you, in a similar way to the sites you linked.

For initial values, as long as its roughly the right order of magnitude, it should converge eventually, but the further from reality the slower - stuff like the sites you linked are probably the best option. Something that can help is to use the less accurate and more stable fvSchemes/fvSolution settings first, then change them once you have a converged-but-inaccurate flow
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komega sst model, komegacoeffs, simplefoam convergence

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