Nonlinear Dynamics of a Microswimmer in Poiseuille Flow
Nonlinear Dynamics of a Microswimmer in Poiseuille Flow
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DOI：
10.1103/physrevlett.108.218104
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发表时间：
2012-05-22
影响因子：
8.6
通讯作者：
Stark, Holger
中科院分区：
文献类型：
--
作者：
Zoettl, Andreas;Stark, Holger
我们研究了圆柱形泊肃叶流中球形微型游泳器的三维动力学，可以将其映射到哈密顿系统。识别摆动和翻滚轨迹。在二维中，它们相当于数学钟摆的振荡和圆周解。游泳者和限制通道壁之间的流体动力相互作用会导致耗散动力学并产生稳定的轨迹，这对于拉动者和推动者来说是不同的。我们在游泳者的偶极近似中证明了这种行为，并使用多粒子碰撞动力学方法进行模拟。
We study the three-dimensional dynamics of a spherical microswimmer in cylindrical Poiseuille flow which can be mapped onto a Hamiltonian system. Swinging and tumbling trajectories are identified. In 2D they are equivalent to oscillating and circling solutions of a mathematical pendulum. Hydrodynamic interactions between the swimmer and confining channel walls lead to dissipative dynamics and result in stable trajectories, different for pullers and pushers. We demonstrate this behavior in the dipole approximation of the swimmer and with simulations using the method of multiparticle collision dynamics.