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EnglishElastic 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 Karman vortex street developing behind the bluff body and the natural frequency of the free bending vibrations of the filament.
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| Titolo: | Spontaneous Symmetry Breaking of a Hinged Flapping Filament Generates Lift |
| Autori: | |
| Data di pubblicazione: | 2012 |
| Rivista: | |
| Abstract: | 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 Karman vortex street developing behind the bluff body and the natural frequency of the free bending vibrations of the filament. |
| Handle: | http://hdl.handle.net/11567/482918 |
| Appare nelle tipologie: | 01.01 - Articolo su rivista |
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