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Directed collective motion of bacteria under channel con fi
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wioland, H. Lushi, Enkeleida |
| Copyright Year | 2016 |
| Abstract | Dense suspensions of swimming bacteria are known to exhibit collective behaviour arising from the interplay of steric and hydrodynamic interactions. Unconfined suspensions exhibit transient, recurring vortices and jets, whereas those confined in circular domainsmay exhibit order in the form of a spiral vortex.Here we show that confinement into a long and narrowmacroscopic ‘racetrack’ geometry stabilises bacterialmotion to form a steady unidirectional circulation. Thismotion is reproduced in simulations of discrete swimmers that reveal the crucial role that bacteria-driven fluid flows play in the dynamics. In particular, cells close to the channel wall produce strongflowswhich advect cells in the bulk against their swimming direction.We examine in detail the transition from a disordered state to persistent directedmotion as a function of the channel width, and show that the width at the crossover point is comparable to the typical correlation length of swirls seen in the unbounded system.Our results shed light on themechanisms driving the collective behaviour of bacteria and other activematter systems, and stress the importance of the ubiquitous boundaries found in natural habitats. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.damtp.cam.ac.uk/user/gold/pdfs/racetracks.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Blood Circulation Collective motion Flow Habitat Hydrodynamics Interaction Naruto Shippuden: Clash of Ninja Revolution 3 Simulation Spiral wave Suspensions Vortex width |
| Content Type | Text |
| Resource Type | Article |
