Lagrangian and Eulerian view of the bursting period
作者:
Be´renge`re Podvin,
John Gibson,
Gal Berkooz,
John Lumley,
期刊:
Physics of Fluids
(AIP Available online 1997)
卷期:
Volume 9,
issue 2
页码: 433-437
ISSN:1070-6631
年代: 1997
DOI:10.1063/1.869137
出版商: AIP
数据来源: AIP
摘要:
Low-dimensional models for the turbulent wall layer display an intermittent phenomenon with an ejection phase and a sweep phase that strongly resembles the bursting phenomenon observed in experimental flows. The probability distribution of inter-burst times has the observed shape [E. Stone and P. J. Holmes, Physica D37, 20 (1989); SIAM J. Appl. Math.50, 726 (1990); Phys. Lett. A5, 29 (1991); P. J. Holmes and E. Stone, inStudies in Turbulence, edited by T. B. Gatski, S. Sarkar, and C. G. Speziale (Springer, Heidelberg, 1992)]. However, the time scales both for bursts and interburst durations are unrealistically long, a fact that was not appreciated until recently. We believe that the long time scales are due to the model’s inclusion of only a single coherent structure, when in fact a succession of quasi-independent structures are being swept past the sensor in an experiment. A simple statistical model of this situation restores the magnitude of the observed bursting period, although there is a great deal of flexibility in the various parameters involved. ©1997 American Institute of Physics.
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