Sampling Skewness of velocity field

fs82 · July 5, 2011, 06:14

I need the skewness of the velocity field. Has anybody already done this? I think the best way would be to include the sampling of mean(u_i*u_j*u_k) in fieldAverage.C. May be there is a better way for doing that?

kind regards,
Fabian

fs82 · May 3, 2012, 10:24

Allright I will answer myself to close this topic. Sampling of Skewness and Kurtosis seems to be a bit tricky in fieldAverage.C. But one can use snapshots of the velocity field (ensure enough time between the snapshots to avoid strong corelations) to calculate the high order statistics during the postprocessing. I wrote a tool for that, which works really fine.

kind regards,
Fabian

July 5, 2011, 06:14	Sampling Skewness of velocity field	#1
fs82 Senior Member Dr. Fabian Schlegel Join Date: Apr 2009 Location: Dresden, Germany Posts: 222 Rep Power: 18	I need the skewness of the velocity field. Has anybody already done this? I think the best way would be to include the sampling of mean(u_iu_ju_k) in fieldAverage.C. May be there is a better way for doing that? kind regards, Fabian

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May 3, 2012, 10:24		#2
fs82 Senior Member Dr. Fabian Schlegel Join Date: Apr 2009 Location: Dresden, Germany Posts: 222 Rep Power: 18	Allright I will answer myself to close this topic. Sampling of Skewness and Kurtosis seems to be a bit tricky in fieldAverage.C. But one can use snapshots of the velocity field (ensure enough time between the snapshots to avoid strong corelations) to calculate the high order statistics during the postprocessing. I wrote a tool for that, which works really fine. kind regards, Fabian