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dc.contributor.authorWioland, Hen
dc.contributor.authorLushi, Een
dc.contributor.authorGoldstein, Raymonden
dc.date.accessioned2016-07-04T14:47:19Z
dc.date.available2016-07-04T14:47:19Z
dc.date.issued2016-07-01en
dc.identifier.issn1367-2630
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/256595
dc.description.abstractDense 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 domains may exhibit order in the form of a spiral vortex. Here we show that confinement into a long and narrow macroscopic ‘racetrack’ geometry stabilises bacterial motion to form a steady unidirectional circulation. This motion 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 strong flows which advect cells in the bulk against their swimming direction.Weexamine in detail the transition from a disordered state to persistent directed motion 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 the mechanisms driving the collective behaviour of bacteria and other active matter systems, and stress the importance of the ubiquitous boundaries found in natural habitats.
dc.languageEnglishen
dc.language.isoenen
dc.publisherInstitute of Physics
dc.rightsAttribution 4.0 International*
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectbacteriaen
dc.subjectconfinementen
dc.subjectcollective behaviouren
dc.titleDirected collective motion of bacteria under channel confinementen
dc.typeArticle
dc.description.versionThis is the final published version. It first appeared at http://dx.doi.org/10.1088/1367-2630/18/7/075002.en
prism.number075002en
prism.publicationDate2016en
prism.publicationNameNew Journal of Physicsen
prism.volume18en
dc.identifier.doi10.17863/CAM.533
dcterms.dateAccepted2016-06-03en
rioxxterms.versionofrecord10.1088/1367-2630/18/7/075002en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2016-07-01en
dc.contributor.orcidGoldstein, Raymond [0000-0003-2645-0598]
dc.identifier.eissn1367-2630
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEuropean Research Council (247333)


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International