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Foils oscillating transversely to an oncoming uniform flow produce, under certain conditions, thrust. It is shown through experimental data from flapping foils and data from fish observation that thrust develops through the formation of a reverse von Kármán street whose preferred Strouhal number is between 0.25 and 0.35, and that optimal foil efficiency is achieved within this Strouhal range.
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Triantafyllou et al. (Sun,) studied this question.
www.synapsesocial.com/papers/69dd547880eea7d3f699b866 — DOI: https://doi.org/10.1063/1.858173
Michael S. Triantafyllou
George S. Triantafyllou
R. Gopalkrishnan
Physics of Fluids A Fluid Dynamics
Massachusetts Institute of Technology
City College of New York
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