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Spontaneous symmetry breaking of a hinged flapping filament generates lift
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-8209-1449
2012 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 109, no 15, 154502- p.Article in journal (Refereed) Published
Abstract [en]

Elastic filamentous structures found on swimming and flying organisms are versatile in function, rendering their precise contribution to locomotion difficult to assess. We show in this Letter that a single passive filament hinged on the rear of a bluff body placed in a stream can generate a net lift force without increasing the mean drag force on the body. This is a consequence of spontaneous symmetry breaking in the filament's flapping dynamics. The phenomenon is related to a resonance between the frequency associated with the von Kármán vortex street developing behind the bluff body and the natural frequency of the free bending vibrations of the filament.

Place, publisher, year, edition, pages
2012. Vol. 109, no 15, 154502- p.
Keyword [en]
Bluff body, Drag forces, Free-bending, Lift force, Spontaneous symmetry breaking, Vortex street
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-105435DOI: 10.1103/PhysRevLett.109.154502ISI: 000309772600005ScopusID: 2-s2.0-84867558358OAI: diva2:571264
EU, FP7, Seventh Framework Programme, FP7-PEOPLE-2010-IEF-272335-REDWINGSwedish e‐Science Research Center

QC 20121122

Available from: 2012-11-22 Created: 2012-11-21 Last updated: 2013-04-08Bibliographically approved

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Bagheri, Shervin
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Stability, Transition and ControlLinné Flow Center, FLOW
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