Effects of roughness on the intermittent maintenance of Reynolds shear stress in pipe flow
作者:
J. Sabot,
I. Saleh,
G. Comte‐Bellot,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1977)
卷期:
Volume 20,
issue 10
页码: 150-155
ISSN:0031-9171
年代: 1977
DOI:10.1063/1.861724
出版商: AIP
数据来源: AIP
摘要:
The presence of a rough wall does not fundamentally alter the intermittent maintenance of Reynolds shear stress as found for turbulent flows over a smooth wall, be it boundary layers or pipe flows. Ejections, and to a lesser extent sweeps, are still the dominant events contributing to the shear stress. The mean period of occurrence of the violent ejections (those whose amplitude exceeds a characteristic threshold) is, however, larger for the rough pipe than it is for the smooth pipe at the same Reynolds number. A scaling based on specific parameters of the largest scale motions is proposed. The mean length scale of the violent ejections is larger than those encountered for a smooth pipe, but still seems to be of the order of the integral length scale of the transverse component of the velocity fluctuation.
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