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Natural logarithms

Published online by Cambridge University Press:  08 February 2013

B. J. McKeon
B. J. McKeon*
Affiliation:
Graduate Aerospace Laboratories, California Institute of Technology, Pasadena, CA 91125, USA
*
†Email address for correspondence: mckeon@caltech.edu
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Abstract

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Marusic et al. (J. Fluid Mech., vol. 716, 2013, R3) show the first clear evidence of universal logarithmic scaling emerging naturally (and simultaneously) in the mean velocity and the intensity of the streamwise velocity fluctuations about that mean in canonical turbulent flows near walls. These observations represent a significant advance in understanding of the behaviour of wall turbulence at high Reynolds number, but perhaps the most exciting implication of the experimental results lies in the agreement with the predictions of such scaling from a model introduced by Townsend (J. Fluid Mech., vol. 11, 1961, pp. 97–120), commonly termed the attached eddy hypothesis. The elegantly simple, yet powerful, study by Marusic et al. should spark further investigation of the behaviour of all fluctuating velocity components at high Reynolds numbers and the outstanding predictions of the attached eddy hypothesis.

JFM classification

Boundary Layers: Pipe flow boundary layerTurbulent Flows: Turbulent boundary layers

Information

Type
Focus on Fluids
Information
Journal of Fluid Mechanics , Volume 718 , 10 March 2013, pp. 1 - 4
Copyright
©2013 Cambridge University Press 

References

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