Hydrodynamics can determine the optimal route for microswimmer navigation
Hydrodynamics can determine the optimal route for microswimmer navigation
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DOI：
10.1038/s42005-021-00522-6
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发表时间：
2021-02-02
影响因子：
5.5
通讯作者：
Liebchen, Benno
中科院分区：
文献类型：
--
作者：
Daddi-Moussa-Ider, Abdallah;Lowen, Hartmut;Liebchen, Benno
虽然最佳导航的控制理论在从航空到靶向药物输送的各个尺度上都具有相关性，但热波动以及微尺度上与界面、墙壁和障碍物的流体动力学相互作用的作用仍然是一个悬而未决的问题。在这里，作者探索了在存在墙壁或障碍物的情况下的最佳微游泳，并研究了微游泳器与墙壁之间的水动力相互作用如何影响最佳微游泳策略。与如何引导飞机或月球着陆器等宏观主体以最佳方式到达目标的已深入研究的问题相比，经历与墙壁和水动力相互作用的微游泳器的最佳导航策略 人们对障碍的了解还少得多。在这里，我们系统地探讨了这个问题，并表明微游泳器流场特征对以最快方式到达目标所需的导航策略有至关重要的影响。由此产生的最佳轨迹可能具有显着且非直观的形状，其在质量上不同于干燥的活性颗粒或运动的宏观药剂。我们的研究结果提供了对微观尺度上流体动力学和波动对最佳导航的作用的见解，并表明微生物在策略性地控制其与远处墙壁的距离时可能具有生存优势。
While control theory for optimal navigation is relevant across scales, from aeronautics to targeted drug delivery, the role of thermal fluctuations and hydrodynamic interactions with interfaces, walls and obstacles at the microscale remains an open question. Here, the authors explore optimal microswimming in the presence of walls or obstacles, and study how hydrodynamic microswimmer-wall interactions impact on optimal microswimming strategies.As compared to the well explored problem of how to steer a macroscopic agent, like an airplane or a moon lander, to optimally reach a target, optimal navigation strategies for microswimmers experiencing hydrodynamic interactions with walls and obstacles are far-less understood. Here, we systematically explore this problem and show that the characteristic microswimmer-flow-field crucially influences the navigation strategy required to reach a target in the fastest way. The resulting optimal trajectories can have remarkable and non-intuitive shapes, which qualitatively differ from those of dry active particles or motile macroagents. Our results provide insights into the role of hydrodynamics and fluctuations on optimal navigation at the microscale, and suggest that microorganisms might have survival advantages when strategically controlling their distance to remote walls.