Conditional correlation between a passive scalar and its dissipation in a turbulent boundary layer

Conditional correlation between a passive scalar and its dissipation in a turbulent boundary layer  A study of the conditional correlation between a passive scalar and its dissipation offers an interesting strategy for understanding turbulence properties associated with both large and small scales. This correlation is investigated with particular emphasis on the dominant coherent motions in turbulent boundary layers; namely, sweeps and ejections, using a local cross-correlation analysis based on the wavelet transform. Contributions to the three temperature derivatives show different features, reflecting clear “local” departures from isotropy. This property of coherent motions is investigated through the conditional cross-spectra inferred from the wavelet analysis, which provides localized scale decomposition of the quantity under consideration, and is translated in the spectral domain. These decompositions indicate the particular coherent motions of the flow which most contribute to the conditional correlation between temperature and its dissipation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Conditional correlation between a passive scalar and its dissipation in a turbulent boundary layer

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Publisher
Springer-Verlag
Copyright
Copyright © 1999 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s003480050315
Publisher site
See Article on Publisher Site

Abstract

 A study of the conditional correlation between a passive scalar and its dissipation offers an interesting strategy for understanding turbulence properties associated with both large and small scales. This correlation is investigated with particular emphasis on the dominant coherent motions in turbulent boundary layers; namely, sweeps and ejections, using a local cross-correlation analysis based on the wavelet transform. Contributions to the three temperature derivatives show different features, reflecting clear “local” departures from isotropy. This property of coherent motions is investigated through the conditional cross-spectra inferred from the wavelet analysis, which provides localized scale decomposition of the quantity under consideration, and is translated in the spectral domain. These decompositions indicate the particular coherent motions of the flow which most contribute to the conditional correlation between temperature and its dissipation.

Journal

Experiments in FluidsSpringer Journals

Published: May 4, 1999

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