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Old   June 21, 2011, 15:37
Default rms velocity fluctuations
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ak
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Hello Foamers,

Does anyone know how we can calculate rms velocity fluctuations (during runtime or during post-processing)?
I am relatively new to using OF, so would appreciate any inputs!

Thanks so much,
ak
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Old   June 22, 2011, 04:01
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Gregor Olenik
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Hi,

have a look at fieldAverage HOWTO use fieldAverage where prime2Mean is the variance (RMS^2)

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Old   June 22, 2011, 14:09
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Thanks gregor!

I see that UPrime2Mean has 6 components. Does it correspond to the Reynolds stress tensor?

Thanks,
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Old   June 27, 2011, 09:13
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Gregor Olenik
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its a part of the reynolds stresses (since you are using only the resolved scales without the modeled stresses to compute it, look for it under src/postProcessing/functionObjects/field/fieldAverage/fieldAverage/fieldAverageTemplates.C)

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Last edited by gregor; June 27, 2011 at 11:59.
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