旋转湍流瑞利-贝纳德对流中的边界带状流
Boundary Zonal Flow in Rotating Turbulent Rayleigh-Bénard Convection.
作者信息
Zhang Xuan, van Gils Dennis P M, Horn Susanne, Wedi Marcel, Zwirner Lukas, Ahlers Guenter, Ecke Robert E, Weiss Stephan, Bodenschatz Eberhard, Shishkina Olga
机构信息
Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany.
Physics of Fluids Group, J.M. Burgers Center for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands.
出版信息
Phys Rev Lett. 2020 Feb 28;124(8):084505. doi: 10.1103/PhysRevLett.124.084505.
For rapidly rotating turbulent Rayleigh-Bénard convection in a slender cylindrical cell, experiments and direct numerical simulations reveal a boundary zonal flow (BZF) that replaces the classical large-scale circulation. The BZF is located near the vertical side wall and enables enhanced heat transport there. Although the azimuthal velocity of the BZF is cyclonic (in the rotating frame), the temperature is an anticyclonic traveling wave of mode one, whose signature is a bimodal temperature distribution near the radial boundary. The BZF width is found to scale like Ra^{1/4}Ek^{2/3} where the Ekman number Ek decreases with increasing rotation rate.
对于细长圆柱形容器中快速旋转的湍流瑞利-贝纳德对流，实验和直接数值模拟揭示了一种边界纬向流（BZF），它取代了经典的大尺度环流。BZF位于垂直侧壁附近，能够增强那里的热传输。尽管BZF的方位角速度是气旋性的（在旋转参考系中），但温度是模式为一的反气旋行波，其特征是在径向边界附近出现双峰温度分布。发现BZF的宽度与(Ra^{1/4}Ek^{2/3})成比例，其中埃克曼数Ek随着旋转速率的增加而减小。
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