Dynamics of a chiral swimmer sedimenting on a flat plate

Numerical simulation of vortex-induced drag of elastic swimmer models

We present numerical simulations of simplified models for swimming organisms or robots, using chordwise flexible elastic plates. We focus on the tip vortices originating from three-dimensional effects due to the finite span of the plate. These effects play an important role when predicting the swimmer's cruising velocity, since they contribute significantly to the drag force. First we simulate swimmers with rectangular plates of different aspect ratio and compare the results with a recent experimental study. Then we consider plates with expanding and contracting shapes. We find the cruising ve…

沉降squirmer与平面壁之间的流体动力学相互作用

Hydrodynamic interactions between a sedimenting squirmer and a planar wall

本文研究沉降squirmer与平面无滑移壁的流固耦合，通过精确解验证自适应边界积分程序，并刻画重力诱导的壁附近分岔与多种运动模式。

波动板理论向多个相互作用游动体的推广

Generalization of waving-plate theory to multiple interacting swimmers

本文利用多连通复分析和Schottky-Klein素函数，将Wu的波动板理论推广到任意数量游动体的水动力相互作用，并通过数值实现验证了与实验一致的结果。

Modelling of an actuated elastic swimmer

We study the force production dynamics of undulating elastic plates as a model for fish-like inertial swimmers. Using a beam model coupled with Lighthill's large-amplitude elongated-body theory, we explore different localised actuations at one extremity of the plate (heaving, pitching, and a combination of both) in order to quantify the reactive and resistive contributions to the thrust. The latter has the form of a quadratic drag in large Reynolds number swimmers and has recently been pointed out as a crucial element in the thrust force balance. We validate the output of a weakly nonlinear so…

弹性、非重球体在矩形管道中沉降的动力学

Dynamics of elastic, nonheavy spheres sedimenting in a rectangular duct

本文通过低雷诺数矩形管道模型实验，揭示弹性非重球体沉降的四阶段动力学及可变形性导致的更高终端速度。

Periodic and Quasiperiodic Motion of an Elongated Microswimmer in Poiseuille Flow

We study the dynamics of a prolate spheroidal microswimmer in Poiseuille flow for different flow geometries. When moving between two parallel plates or in a cylindrical microchannel, the swimmer performs either periodic swinging or periodic tumbling motion. Although the trajectories of spherical and elongated swimmers are qualitatively similar, the swinging and tumbling frequency strongly depends on the aspect ratio of the swimmer. In channels with reduced symmetry the swimmers perform quasiperiodic motion which we demonstrate explicitely for swimming in a channel with elliptical cross section…