Nordita Astrophysics Seminars

Spontaneous Symmetry Breaking of a Hinged Flapping Filament Generates Lift

Name: Spontaneous Symmetry Breaking of a Hinged Flapping Filament Generates Lift
Start: 2012-10-24T13:30:00+02:00
End: 2012-10-24T13:30:00+02:00
Location: No location set

by Shervin Bagheri (Linné Flow Centre KTH Mechanics, Stockholm)

Wednesday 24 Oct 2012, 13:30 → 13:30 Europe/Stockholm

122:026

Description

Elastic filamentous structures found on swimming and flying organisms are versatile in function, rendering their precise contribution to locomotion difficult to assess. In this talk, we discuss how 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 to the von-K ́arman vortex street developing behind the bluff body and the natural frequency of the free bending vibrations of the filament. Moreover, the immersed boundary method employed to numerical solve the fluid-structure interaction will be discussed.