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Second order structure functions in fully developed turbulence

Second order structure functions in fully developed turbulence

Authors :
Huang, Yx
Schmitt, François G
Lu, Zm.
Fougairolles, P.
Gagne, Y.
Liu, Yl.
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG)
Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS)
Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord])
Source :
Physical Review, Physical Review, American Physical Society (APS), 2010, 82, pp.026319, Physical Review, 2010, 82, pp.026319
Publication Year :
2010
Publisher :
HAL CCSD, 2010.

Abstract

International audience; We relate the second-order structure function of a time series with the power spectrum of the original variable, taking an assumption of statistical stationarity. With this approach, we find that the structure function is strongly influenced by the large scales. The large-scale contribution and the contribution range are, respectively, 79% and 1.4 decades for a Kolmogorov -5/3 power spectrum. We show numerically that a single scale influence range, over smaller scales is about 2 decades. We argue that the structure function is not a good method to extract the scaling exponents when the data possess large energetic scales. An alternative methodology, the arbitrary order Hilbert spectral analysis which may constrain this influence within 0.3 decade, is proposed to characterize the scaling property directly in an amplitude-frequency space. An analysis of passive scalar (temperature) turbulence time series is presented to show the influence of large-scale structures in real turbulence and the efficiency of the Hilbert-based methodology. The corresponding scaling exponents ζ(θ)(q) provided by the Hilbert-based approach indicate that the passive scalar turbulence field may be less intermittent than what was previously believed

Details

Language :
English
ISSN :
0031899X and 15366065
Database :
OpenAIRE
Journal :
Physical Review, Physical Review, American Physical Society (APS), 2010, 82, pp.026319, Physical Review, 2010, 82, pp.026319
Accession number :
edsair.dedup.wf.001..83bf3b374398121f6e0231c1bc58f9cf