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Channel turbulence with spanwise rotation studied using helical wave decomposition

Published online by Cambridge University Press:  16 December 2011

Yan-Tao Yang  and
Jie-Zhi Wu
Yan-Tao Yang*
Affiliation:
Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, China State Key Laboratory of Turbulence and Complex System, College of Engineering, Peking University, Beijing 100871, China
Jie-Zhi Wu
Affiliation:
State Key Laboratory of Turbulence and Complex System, College of Engineering, Peking University, Beijing 100871, China
*
†Email address for correspondence: yytmech@pku.edu.cn
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Abstract

Turbulent channel flow with spanwise rotation is studied by direct numerical simulation (DNS) and the so-called helical wave decomposition (HWD). For a wall-bounded channel domain, HWD decomposes the flow fields into helical modes with different scales and opposite polarities, which allows us to investigate the energy distribution and nonlinear transfer among various scales. Our numerical results reveal that for slow rotation, the fluctuating energy concentrates into large-scale modes. The flow visualizations show that the fine vortices at the unstable side of the channel form long columns, which are basically along the streamwise direction and may be related to the roll cells reported in previous studies. As the rotation rate increases, the concentration of the fluctuating energy shifts towards smaller scales. For strong rotation, an inverse energy cascade occurs due to the nonlinear interaction of the fluctuating modes. A possible mechanism for this inverse cascade is then proposed and attributed to the Coriolis effect. That is, under strong rotation the fluctuating Coriolis force tends to be parallel to the fluctuating vorticity in the region where the streamwise mean velocity has linear profile. Thus the force can induce strong axial stretching/shrinking of the vortices and change the scales of the vortical structures significantly.

JFM classification

Turbulent Flows: Rotating turbulence Turbulent Flows: Turbulence simulation Turbulent Flows: Turbulence theory
Type
Papers
Information
Journal of Fluid Mechanics , Volume 692 , 10 February 2012 , pp. 137 - 152
Copyright
Copyright © Cambridge University Press 2011

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