Phase-reduction for synchronization of oscillating flow by perturbation on surrounding structure
Phase-reduction for synchronization of oscillating flow by perturbation on surrounding structure
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DOI：
10.1017/jfm.2020.1110
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发表时间：
2021-02-01
影响因子：
3.7
通讯作者：
Kotani, Kiyoshi
中科院分区：
文献类型：
--
作者：
Loe, Innocentio A.;Nakao, Hiroya;Kotani, Kiyoshi
通过周围弹性结构的变形来调节流体流动在许多自然和人工系统中被观察到，例如在心血管系统中。作为研究振荡流动规律的第一步，我们考虑了在正弦外力作用下弹性结构内圆柱涡脱落的同步性。利用相位约化理论对振动流固耦合动力学的同步特性进行了研究。我们发现，相位灵敏度函数，它表征的振荡的相位响应，显着的柯西数的影响和轻微的影响，流体与结构的密度比和泊松比的结构材料，固定的模型配置和雷诺数。预测的同步特性与直接数值模拟的结果非常吻合。当正弦扰动施加在圆柱下游端附近时，同步区域最大化。这些发现打开了进一步的可能性，利用相还原理论来表征同步在其他实际问题中表现出流体-结构耦合动力学，如在生物系统和微流体控制。
Regulation of fluid flow by deformations of the surrounding elastic structure is observed in many natural and artificial system, such as in the cardiovascular system. As the first step to study the regulation of oscillating flows, we consider synchronization of vortex shedding past a cylinder within an elastic structure with a sinusoidal external forcing. We use phase-reduction theory to evaluate the synchronization characteristics of the oscillating fluid-structure coupled dynamics. We find that the phase-sensitivity function, which characterizes the phase-response of the oscillation, is significantly affected by the Cauchy number and slightly affected by the fluid-to-structure density ratio and Poisson's ratio of the structure material, for fixed model configuration and Reynolds number. The predicted synchronization characteristics are in close agreement with results from direct numerical simulations. The synchronization region is maximized when the sinusoidal perturbation is applied near the downstream end of the cylinder. These findings open further possibility for the utilization of phase-reduction theory to characterize synchronization in other practical problems exhibiting fluid-structure coupled dynamics, such as in biological systems and the control of microfluidics.