Energy flux fluctuations in a finite volume of turbulent flow

The flux of turbulent kinetic energy from large to small spatial scales is measured in a small domain of varying size . The probability distribution function of the flux is obtained using a time-local version of Kolmogorov four-fifths law. The measurements, made at a moderate Reynolds number, show f...

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Bibliographic Details
Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2006-02, Vol.73 (2 Pt 2), p.026308-026308, Article 026308
Main Authors: Bandi, M M, Goldburg, W I, Cressman, Jr, J R, Pumir, A
Format: Article
Language:English
Subjects:
Chaotic Dynamics
Nonlinear Sciences
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Summary:The flux of turbulent kinetic energy from large to small spatial scales is measured in a small domain of varying size . The probability distribution function of the flux is obtained using a time-local version of Kolmogorov four-fifths law. The measurements, made at a moderate Reynolds number, show frequent events where the flux is backscattered from small to large scales, their frequency increasing as is decreased. The observations are corroborated by a numerical simulation based on the motion of many particles and on an explicit form of the eddy damping.
ISSN:1539-3755
1550-2376
DOI:10.1103/PhysRevE.73.026308