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Intermittency in the atmospheric surface layer: Unresolved or slowly varying?

Guala, M. and Metzger, M. and McKeon, B. J. (2010) Intermittency in the atmospheric surface layer: Unresolved or slowly varying? Physica D, 239 (14). pp. 1251-1257. ISSN 0167-2789. https://resolver.caltech.edu/CaltechAUTHORS:20100809-092327681

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Abstract

We present streamwise velocity structure functions <δv_L(τ)>=<|v(t+τ)−v(t)|^p> (with p=1:5) obtained in the near neutral atmospheric surface layer at the Utah SLTEST site at the highest terrestrial Reynolds number Re_τ=O(10^6). We show that the occurrence of very large scale coherent oscillations in the streamwise velocity throughout the wall region, interpreted as genuine structural features of the canonical turbulent boundary layer, affects the scaling exponents of the p>3 order structure functions. This results in a slight alteration of the intermittent behavior of the velocity field. It was found that for positive (fast) large scale oscillation of the low-pass filtered velocity signal, deviations from the Kolmogorov K41 prediction (absence of multiscaling) are more marked, as compared to negative (slow) excursion. The results are discussed in terms of convergence of statistics from atmospheric boundary layer measurements.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.physd.2009.10.010DOIArticle
ORCID:
AuthorORCID
McKeon, B. J.0000-0003-4220-1583
Additional Information:© 2009 Elsevier B.V. Available online 18 October 2009. We wish to acknowledge ONR grant #N00014-08-1-0897 and Ron Joslin as the program manager.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-08-1-0897
Subject Keywords:Intermittency; Atmosphere; Large-scales; Turbulence
Issue or Number:14
Record Number:CaltechAUTHORS:20100809-092327681
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100809-092327681
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19335
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Aug 2010 21:05
Last Modified:03 Oct 2019 01:55

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