Kinematics and Dynamics of Turbulent Bands at Low Reynolds Numbers in Channel Flow.
Kinematics and Dynamics of Turbulent Bands at Low Reynolds Numbers in Channel Flow.
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河道流中低雷诺数湍流带的运动学和动力学
DOI：
10.3390/e22101167
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发表时间：
2020-10-16
期刊：
影响因子：
--
通讯作者：
Song B
中科院分区：
文献类型：
--
作者：
Xiao X;Song B
槽道流动湍流在过渡雷诺数下表现出有趣的时空复杂性。本文研究了大流域中完全局域湍带的运动学和动力学问题。我们讨论了在理解完全局域带下游端的波浪产生方面的最新进展。在此基础上，提出了一种可能的倾斜方向选择机制。在不同雷诺数下，测量了低速条纹在湍流带中的传播速度和低速条纹的平流速度。不同于以往的研究，我们提出，从湍流带的形成和发展的角度来看，倾斜角应该由下游端和整体条纹之间的相对速度来确定，而不是像以前的研究那样将整个谱带视为倾斜对象来测量倾角。在相对较低的雷诺数下，我们对倾角的计算与文献报道的结果吻合得很好。
Channel flow turbulence exhibits interesting spatiotemporal complexities at transitional Reynolds numbers. In this paper, we investigated some aspects of the kinematics and dynamics of fully localized turbulent bands in large flow domains. We discussed the recent advancement in the understanding of the wave-generation at the downstream end of fully localized bands. Based on the discussion, we proposed a possible mechanism for the tilt direction selection. We measured the propagation speed of the downstream end and the advection speed of the low-speed streaks in the bulk of turbulent bands at various Reynolds numbers. Instead of measuring the tilt angle by treating an entire band as a tilted object as in prior studies, we proposed that, from the point of view of the formation and growth of turbulent bands, the tilt angle should be determined by the relative speed between the downstream end and the streaks in the bulk. We obtained a good agreement between our calculation of the tilt angle and the reported results in the literature at relatively low Reynolds numbers.
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影响因子：
4.6
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