游泳细菌在水面上的水动力盘旋

Pyae Hein Htet, Debasish Das, Eric Lauga
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引用次数: 0

摘要

鞭毛细菌在流体力学上会被刚性壁面吸引,但过去的研究显示它们有一种 "悬停 "状态,即在有限高度的壁面上稳定游动。我们利用数值和理论揭示了悬停的物理起源。模拟首先表明,悬停需要一个拉长的细胞体,并由远离墙壁的倾斜产生。然后,理论模型确定了两个重要的不对称现象:宽度不对称细胞对长度不对称细胞产生的活跃气流的响应。一个最小模型调和了近场和远场流体力学,捕捉到了悬停的所有关键特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrodynamic hovering of swimming bacteria above surfaces
Flagellated bacteria are hydrodynamically attracted to rigid walls, yet past work shows a 'hovering' state where they swim stably at a finite height above surfaces. We use numerics and theory to reveal the physical origin of hovering. Simulations first show that hovering requires an elongated cell body and results from a tilt away from the wall. Theoretical models then identify two essential asymmetries: the response of width-asymmetric cells to active flows created by length-asymmetric cells. A minimal model reconciles near and far-field hydrodynamics, capturing all key features of hovering.
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