Large- and very-large-scale motions in channel and boundary-layer flows

被引:414
作者
Balakumar, B. J.
Adrian, R. J. [1 ]
机构
[1] Arizona State Univ, Dept Mech & Aerosp Engn, Tempe, AZ 85287 USA
[2] Univ Illinois, Dept Theoret & Appl Mech, Urbana, IL 61801 USA
来源
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2007年 / 365卷 / 1852期
关键词
hairpin-vortex packets; large-scale motions; very-large-scale motions; long-wavelength motions; travelling wave solutions; channel flow;
D O I
10.1098/rsta.2006.1940
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Large-scale motions ( LSMs; having wavelengths up to 2 3 pipe radii) and very-LSMs ( having wavelengths more than 3 pipe radii) have been shown to carry more than half of the kinetic energy and Reynolds shear stress in a fully developed pipe flow. Studies using essentially the same methods of measurement and analysis have been extended to channel and zero-pressure-gradient boundary-layer flows to determine whether large structures appear in these canonical wall flows and how their properties compare with that of the pipe flow. The very large scales, especially those of the boundary layer, are shorter than the corresponding scales in the pipe flow, but otherwise share a common behaviour, suggesting that they arise from similar mechanism( s) aside from the modifying influences of the outer geometries. Spectra of the net force due to the Reynolds shear stress in the channel and boundary layer flows are similar to those in the pipe flow. They show that the very-large-scale and main turbulent motions act to decelerate the flow in the region above the maximum of the Reynolds shear stress.
引用
收藏
页码:665 / 681
页数:17
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