Spontaneous symmetry breaking of a hinged flapping filament generates lift.

@article{Bagheri2012SpontaneousSB,
  title={Spontaneous symmetry breaking of a hinged flapping filament generates lift.},
  author={Shervin Bagheri and Andrea Mazzino and Alessandro Bottaro},
  journal={Physical review letters},
  year={2012},
  volume={109 15},
  pages={
          154502
        }
}
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… CONTINUE READING

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