Guala, M. and Metzger, M. and McKeon, B. J. (2011) Interactions within the turbulent boundary layer at high Reynolds number. Journal of Fluid Mechanics, 666 . pp. 573-604. ISSN 0022-1120. https://resolver.caltech.edu/CaltechAUTHORS:20110307-143116884
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Abstract
Simultaneous streamwise velocity measurements across the vertical direction obtained in the atmospheric surface layer (Re_τ ≃ 5 × 10^5) under near thermally neutral conditions are used to outline and quantify interactions between the scales of turbulence, from the very-large-scale motions to the dissipative scales. Results from conditioned spectra, joint probability density functions and conditional averages show that the signature of very-large-scale oscillations can be found across the whole wall region and that these scales interact with the near-wall turbulence from the energy-containing eddies to the dissipative scales, most strongly in a layer close to the wall, z^+ ≲ 10^3. The scale separation achievable in the atmospheric surface layer appears to be a key difference from the low-Reynolds-number picture, in which structures attached to the wall are known to extend through the full wall-normal extent of the boundary layer. A phenomenological picture of very-large-scale motions coexisting and interacting with structures from the hairpin paradigm is provided here for the high-Reynolds-number case. In particular, it is inferred that the hairpin-packet conceptual model may not be exhaustively representative of the whole wall region, but only of a near-wall layer of z^+ = O(10^3), where scale interactions are mostly confined.
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Additional Information: | © 2011 Cambridge University Press. Received 8 December 2009; revised 25 August 2010; accepted 25 August 2010. The support of ONR grant N00014-08-1-0897 (programme manager Ron Joslin) is gratefully acknowledged. | |||||||||
Group: | GALCIT | |||||||||
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Record Number: | CaltechAUTHORS:20110307-143116884 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20110307-143116884 | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 22699 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | Tony Diaz | |||||||||
Deposited On: | 08 Mar 2011 18:12 | |||||||||
Last Modified: | 03 Oct 2019 02:39 |
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