Exploring the origin of turbulent Taylor rolls
Exploring the origin of turbulent Taylor rolls
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DOI：
10.1098/rsta.2022.0130
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发表时间：
2023-03-20
期刊：
影响因子：
5
通讯作者：
Ostilla-Monico, Rodolfo
中科院分区：
文献类型：
--
作者：
Jeganathan, Vignesh;Alba, Kamran;Ostilla-Monico, Rodolfo
自Taylor的开创性论文以来，大尺度准轴对称结构的存在一直是研究Taylor- couette流的一个有趣的问题。在本文中，我们通过在固定雷诺数Res=3.6x104下进行一系列数值模拟，同时改变科里奥利参数，来研究它们在高湍流状态下的形成，以分析结构产生和消散时的流动特性。我们展示了科里奥利力如何在边界层内诱导径向和方位速度场之间的单向耦合，但在整体中，存在导致竞争效应的双向耦合。我们讨论了这如何使窄间隙泰勒-库埃特对流流的类比复杂化。然后，我们将这些统计数据与没有无滑移边界层的类似剪切流进行比较，显示了这种双重耦合如何导致非常不同的效果。最后，我们将反思湍流泰勒卷的可能起源。本文是主题问题“泰勒-库埃特及其相关流动在泰勒的开创性哲学学报论文百年纪念（第一部分）”的一部分。
Since Taylor's seminal paper, the existence of large-scale quasi-axisymmetric structures has been a matter of interest when studying Taylor-Couette flow. In this article, we probe their formation in the highly turbulent regime by conducting a series of numerical simulations at a fixed Reynolds number Res=3.6x104 while varying the Coriolis parameter to analyse the flow characteristics as the structures arise and dissipate. We show how the Coriolis force induces a one-way coupling between the radial and azimuthal velocity fields inside the boundary layer, but in the bulk, there is a two-way coupling that causes competing effects. We discuss how this complicates the analogy of narrow-gap Taylor-Couette to other convective flows. We then compare these statistics with a similar shear flow without no-slip boundary layers, showing how this double coupling causes very different effects. We finish by reflecting on the possible origins of turbulent Taylor rolls. This article is part of the theme issue 'Taylor-Couette and related flows on the centennial of Taylor's seminal Philosophical Transactions paper (part 1)'.