Mirzakhanloo Mehdi, Jalali Mir Abbas, Alam Mohammad-Reza
Department of Mechanical Engineering, University of California, Berkeley, CA, 94720, USA.
Sci Rep. 2018 Feb 27;8(1):3670. doi: 10.1038/s41598-018-21832-w.
We unveil orbital topologies of two nearby swimming microorganisms using an artificial microswimmer, called Quadroar. Depending on the initial conditions of the microswimmers, we find diverse families of attractors including dynamical equilibria, bound orbits, braids, and pursuit-evasion games. We also observe a hydrodynamic slingshot effect: a system of two hydrodynamically interacting swimmers moving along braids can advance in space faster than non-interacting swimmers that have the same actuation parameters and initial conditions as the interacting ones. Our findings suggest the existence of complex collective behaviors of microswimmers, from equilibrium to rapidly streaming states.
我们使用一种名为Quadroar的人工微游动器揭示了两种附近游动微生物的轨道拓扑结构。根据微游动器的初始条件，我们发现了不同类型的吸引子，包括动态平衡、束缚轨道、辫子轨道和追逃博弈。我们还观察到一种流体动力弹弓效应：两个沿辫子轨道运动且存在流体动力相互作用的游动器系统，在空间中的前进速度比具有相同驱动参数和初始条件的非相互作用游动器更快。我们的研究结果表明，微游动器存在从平衡态到快速流动态的复杂集体行为。
