Collective Motion of Quincke Rollers with Fully Resolved Hydrodynamics
Collective Motion of Quincke Rollers with Fully Resolved Hydrodynamics
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DOI：
10.1002/adts.202200683
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发表时间：
2023-02-03
影响因子：
3.3
通讯作者：
Yamamoto, Ryoichi
中科院分区：
文献类型：
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作者：
Imamura, Shun;Sawaki, Kohei;Yamamoto, Ryoichi
众所周知，流体动力效应会显著影响湿活性物质系统的集体行为。然而，这些相互作用的非线性多体性质使得它们的分析非常困难，特别是在稠密悬浮液中。昆克滚轮是人造微泳者的典型例子之一。这些活性粒子由于均匀的直流电场产生的扭矩而在平板上方自由移动。一个包含许多这样的粒子的系统表现出各种集体动力学，例如无序气体、极性液体和活泼的晶态。这项工作完成了一个包含许多滚子的3D系统的数值模拟，以便显式地解决流体动力相互作用并了解这些相互作用在所产生的主动动力学中所起的作用。结果表明，远场流体动力效应倾向于驱动有序的集体运动，而近场效应倾向于驱动无序的集体行为，并再现不同的集体行为，同时捕捉到轧辊之间的流体动力效应的作用，而不是求助于以往的近似。
Hydrodynamic effects are known to significantly affect the collective behavior of wet active matter systems. However, the non-linear many-body nature of these interactions makes them very challenging to analyze, particularly in dense suspensions. Quincke rollers are one of the canonical examples of artificial microswimmers. These are active particles that move freely above a plate due to the torque generated by a uniform DC electric field. A system involving many such particles exhibits a variety of collective dynamics, such as the disordered gas, polar liquid, and active crystal states. This work accomplishes numerical simulations of a 3D system containing many rollers in order to explicitly resolve the hydrodynamic interactions and understand the role these play in the resulting active dynamics. It reveals that the far-field hydrodynamic effects tend to drive ordered collective motion, while the near-field effects tend to drive disordered collective behavior, and reproduce diverse collective behavior while capturing the role of hydrodynamic effects between rollers without resorting to the approximations previously employed.