Transport barriers to self-propelled particles in fluid flows
Transport barriers to self-propelled particles in fluid flows
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DOI：
10.1103/physrevfluids.6.l012501
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发表时间：
2021-01-14
影响因子：
2.7
通讯作者：
Solomon, Thomas H.
中科院分区：
文献类型：
--
作者：
Berman, Simon A.;Buggeln, John;Solomon, Thomas H.
我们目前的理论和实验证明存在不变的流形，阻碍运动的microswimmer在二维流体流动。双曲线流体流中存在明显的单向屏障，可以阻止平滑游动和翻滚的枯草杆菌细菌的游动。我们确定关键的相空间结构，称为游泳不变流形（SwIMs），作为长期游泳行为的不同区域之间的分隔线。当投影到xy空间时，SwIM的边缘充当单向屏障，与实验一致。
We present theory and experiments demonstrating the existence of invariant manifolds that impede the motion of microswimmers in two-dimensional fluid flows. One-way barriers are apparent in a hyperbolic fluid flow that block the swimming of both smooth-swimming and run-and-tumble Bacillus subtilis bacteria. We identify key phase-space structures, called swimming invariant manifolds (SwIMs), that serve as separatrices between different regions of long-time swimmer behavior. When projected into xy space, the edges of the SwIMs act as one-way barriers, consistent with the experiments.