显式建模聚合物流体中squirmer的动力学
Dynamics of squirmers in explicitly modeled polymeric fluids
AI总结：
本研究利用squirmer模型模拟微型游泳者在聚合物流体中的运动，揭示局部微结构、非连续介质效应及直接丝状物相互作用对不同类型squirmer速度的关键影响。
摘要：
细菌和精子细胞等生物微型游泳者经常遇到复杂的生物流体环境。在这里，我们使用著名的squirmer微型游泳者模型，展示在不同聚合物流体和丝状流体中，局部流体微结构和非连续介质效应对其游泳速度的重要性。令人惊讶的是，我们发现不同类型的squirmer在丝状流体中以显著不同的速度运动，这无法用现有连续介质模型解释，而需要通过考虑squirmer周围的局部流体和聚合物性质来解释。此外，直接的squirmer-聚合物相互作用尤其会减慢pusher（推进型squirmer）的速度，因为大型刚性丝状物会被困在其前方自生的回流区域中。
英文摘要：
Biological microswimmers such as bacteria and sperm cells often encounter complex biological fluid environments. Here we use the well-known squirmer microswimmer model to show the importance of the local fluid microstructure and non-continuum effects on their swimming speed in different polymeric and filamentous fluids. Surprisingly, we find that different squirmer types move at considerably different speed in filamentous fluids which cannot be explained by existing continuum models, but by considering the local fluid and polymer properties around the squirmers. Furthermore, direct squirmer-polymer interactions slow down in particular pushers by trapping large stiff filaments in a self-generated recirculation region in front of them.
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