Hydrodynamic synchronization of autonomously oscillating optically trapped particles

Direct Measurement of Unsteady Microscale Stokes Flow Using Optically Driven Microspheres

A growing body of work on the dynamics of eukaryotic flagella has noted that their oscillation frequencies are sufficiently high that the viscous penetration depth of unsteady Stokes flow is comparable to the scales over which flagella synchronize. Incorporating these effects into theories of synchronization requires an understanding of the global unsteady flows around oscillating bodies. Yet, there has been no precise experimental test on the microscale of the most basic aspects of such unsteady Stokes flow: the orbits of passive tracers and the position-dependent phase lag between the oscill…

Computational fluid dynamics approach for understanding oscillating and interacting convective flows

A 2D numerical hydrodynamics approach is considered for modelling recent experimental results on the oscillation and collective behavior of convective flows. Our simulations consider the rising dynamics of heated fluid columns in a gravitational field. Simulations are done on two entirely different length-scales, showing also the generality of the investigated phenomena. For the flow of a single heated fluid column, the effect of the inflow yield and the nozzle diameter is studied. In agreement with the experiments, for a constant nozzle diameter the oscillation frequency increases approximate…

惯性效应对半被动振荡水翼能量收集器机械效率的影响

Inertial effects on the mechanical efficiency of a semi-passive oscillating hydrofoil energy harvester

实验研究水翼质量比、俯仰轴位置和折合频率如何共同决定半被动振荡水翼的流体动力学和机械效率，发现通过优化配置可实现33.96%的峰值机械效率，且与流体动力学效率存在显著差异。

三维性对振荡圆柱尾流同步的影响

Influence of three-dimensionality on wake synchronization of oscillatory cylinder

本文在 Re=300 下研究三维性对振荡圆柱尾流同步的影响，提出基于系综的相位约化分析框架，发现三维尾流相位敏感函数幅值低于二维情形，导致同步条件更窄，且该差异与圆柱运动引起的三维流动幅值变化密切相关。