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Swimming due to transverse shape deformations

Published online by Cambridge University Press:  17 July 2009

EVA KANSO
EVA KANSO*
Affiliation:
Aerospace and Mechanical Engineering, University of Southern California854 Downey Way, Los Angeles, CA 90089-1191, USA
*
†Email address for correspondence: kanso@usc.edu
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Abstract

Balance laws are derived for the swimming of a deformable body due to prescribed shape changes and the effect of the wake vorticity. The underlying balances of momenta, though classical in nature, provide a unifying framework for the swimming of three-dimensional and planar bodies and they hold even in the presence of viscosity. The derived equations are consistent with Lighthill's reactive force theory for the swimming of slender bodies and, when neglecting vorticity, reduce to the model developed in Kanso et al. (J. Nonlinear Sci., vol. 15, 2005, p. 255) for swimming in potential flow. The locomotion of a deformable body is examined through two sets of examples: the first set studies the effect of cyclic shape deformations, both flapping and undulatory, on the locomotion in potential flow while the second examines the effect of the wake vorticity on the net locomotion. In the latter, the vortex wake is modelled using pairs of point vortices shed periodically from the tail of the deformable body.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 631 , 25 July 2009 , pp. 127 - 148
Copyright
Copyright © Cambridge University Press 2009

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