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-   -   rms velocity fluctuations (http://www.cfd-online.com/Forums/openfoam/89754-rms-velocity-fluctuations.html)

newOFuser June 21, 2011 14:37

rms velocity fluctuations
 
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

gregor June 22, 2011 03:01

Hi,

have a look at fieldAverage http://www.cfd-online.com/Forums/ope...ldaverage.html where prime2Mean is the variance (RMS^2)

gregor

newOFuser June 22, 2011 13:09

Thanks gregor!

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

Thanks,
ak

gregor June 27, 2011 08:13

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)

gregor


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