Abstract
Data collected from several studies of experimental and numerical nature in wall-bounded turbulent flows and in particular in internal flows (channel and pipe flows, Mochizuki and Nieuwstadt [1]) at different Reynolds numbers R +(Ru */ν), indicate that: (i) the peak of the rms-value (normalized by u *) of the streamwise velocity fluctuations (σ u +|peak) is essentially independent of the Reynolds number, (ii) the position of the rms peak value (y +|peak) is weakly dependent of the Reynolds number, (iii) the skewness of the streamwise velocity fluctuations (S u ) is close to zero at the position in which the variance has its peak. A series of measurements of streamwise velocity fluctuations has been performed in turbulent pipe flow with the use of an Ultrasonic Doppler Velocimeter and our results support those reported in [1].
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Alfonsi, G. Analysis of Streamwise Velocity Fluctuations in Turbulent Pipe Flow with the Use of an Ultrasonic Doppler Flowmeter. Flow, Turbulence and Combustion 67, 137–142 (2001). https://doi.org/10.1023/A:1014011510480
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DOI: https://doi.org/10.1023/A:1014011510480