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Interactions within the turbulent boundary layer at high Reynolds number

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.

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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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McKeon, B. J.0000-0003-4220-1583
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.
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Office of Naval Research (ONR)N00014-08-1-0897
Record Number:CaltechAUTHORS:20110307-143116884
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22699
Deposited By: Tony Diaz
Deposited On:08 Mar 2011 18:12
Last Modified:03 Oct 2019 02:39

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