Extensibility enables locomotion under isotropic drag

Details Extensibility enables locomotion under isotropic drag Extensibility enables locomotion under isotropic drag

2011-08-31

arxiv.org/abs/1109.0047v1

Physics of Fluids, 23, 081702, 2011

Physics

Fluid Dynamics

Scientific paper

Anisotropic viscous drag is usually believed to be a requirement for the low Reynolds number locomotion of slender bodies such as flagella and cilia. Here we show that locomotion under isotropic drag is possible for extensible slender bodies. After general considerations, a two-ring swimmer and a model dinoflagellate flagellum are studied analytically to illustrate how extensibility can be exploited for self-propulsion without drag anisotropy. This new degree of freedom could be useful for some complex swimmer geometries and locomotion in complex fluid environments where drag anisotropy is weak or even absent.

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