Study of the motion and interaction of micro-swimmers with different scales in Poiseuille flow

IF 2.5 3区 工程技术 Q2 MECHANICS European Journal of Mechanics B-fluids Pub Date : 2024-11-05 DOI:10.1016/j.euromechflu.2024.11.001
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Abstract

We conducted numerical simulations using the immersed boundary–lattice Boltzmann method to investigate the motion and interaction of microswimmers of different scales in Poiseuille flow. The squirmers self-propelling via generating surface waves were used as the model for microswimmers. The movement of two squirmers with different scale ratios (0.6–1.5), swimming Reynolds numbers (0.1–2.0), swimming strength (1–7), and blockage ratios (0.125–0.25) in Poiseuille flow was studied. Five classical motion patterns were identified: periodic tumbling, steady motion, periodic oscillation, damped oscillation, and chaotic motion modes. Initially, we examined the interaction between a pair of squirmers of the same scale and elucidated the causes of their different motion pattern transitions using the pressure distribution, direction angle, and swimming velocity of the squirmers. We investigated the variation of transport velocity with blockage ratio and swimming strength. A pair of squirmers with small ratios tended to migrate in a stable motion pattern, while those with large ratios showed a high tendency to change their motion patterns. Pushers with an increasing swimming Reynolds number were adsorbed to the wall and migrated stably along the wall.
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不同尺度的微型游泳者在普瓦赛流中的运动和相互作用研究
我们采用沉浸边界-晶格玻尔兹曼法进行了数值模拟,研究了不同尺度的微游泳在波瓦流中的运动和相互作用。微游子的模型是通过产生表面波而自我推进的蠕虫。研究了两只具有不同尺度比(0.6-1.5)、游动雷诺数(0.1-2.0)、游动强度(1-7)和阻塞比(0.125-0.25)的蠕动器在 Poiseuille 流中的运动。确定了五种经典运动模式:周期性翻滚、稳定运动、周期性振荡、阻尼振荡和混沌运动模式。我们首先研究了一对相同尺度蠕虫之间的相互作用,并利用蠕虫的压力分布、方向角和游动速度阐明了它们不同运动模式转换的原因。我们研究了运输速度随阻塞率和游动强度的变化。一对阻塞率较小的蠕虫倾向于以稳定的运动模式迁移,而阻塞率较大的蠕虫则表现出较高的运动模式变化趋势。游动雷诺数增大的蠕动者被吸附在壁上,并沿壁稳定迁移。
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来源期刊
CiteScore
5.90
自引率
3.80%
发文量
127
审稿时长
58 days
期刊介绍: The European Journal of Mechanics - B/Fluids publishes papers in all fields of fluid mechanics. Although investigations in well-established areas are within the scope of the journal, recent developments and innovative ideas are particularly welcome. Theoretical, computational and experimental papers are equally welcome. Mathematical methods, be they deterministic or stochastic, analytical or numerical, will be accepted provided they serve to clarify some identifiable problems in fluid mechanics, and provided the significance of results is explained. Similarly, experimental papers must add physical insight in to the understanding of fluid mechanics.
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