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Open AccessArticle

On the Fluid Dynamical Effects of Synchronization in Side-by-Side Swimmers

Laboratoire de Physique et Mécanique des Milieux Hétérogènes (PMMH, UMR 7636), CNRS, ESPCI Paris–PSL University, Sorbonne Université, Université de Paris, F-75005 Paris, France
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Author to whom correspondence should be addressed.
Current address: Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IFIBA–CONICET, Ciudad Universitaria, Buenos Aires 1428, Argentina.
Biomimetics 2019, 4(4), 77; https://doi.org/10.3390/biomimetics4040077
Received: 28 August 2019 / Revised: 27 November 2019 / Accepted: 2 December 2019 / Published: 5 December 2019
(This article belongs to the Special Issue Fluid Dynamic Interactions in Biological and Bioinspired Propulsion)
In-phase and anti-phase synchronization of neighboring swimmers is examined experimentally using two self-propelled independent flexible foils swimming side-by-side in a water tank. The foils are actuated by pitching oscillations at one extremity—the head of the swimmers—and the flow engendered by their undulations is analyzed using two-dimensional particle image velocimetry in their frontal symmetry plane. Following recent observations on the behavior of real fish, we focus on the comparison between in-phase and anti-phase actuation by fixing all other geometric and kinematic parameters. We show that swimming with a neighbor is beneficial for both synchronizations tested, as compared to swimming alone, with an advantage for the anti-phase synchronization. We show that the advantage of anti-phase synchronization in terms of swimming performance for the two-foil “school” results from the emergence of a periodic coherent jet between the two swimmers. View Full-Text
Keywords: collective swimming; bio-inspired swimmers; fluid–structure interaction; self-propulsion; synchronization; fish schooling collective swimming; bio-inspired swimmers; fluid–structure interaction; self-propulsion; synchronization; fish schooling
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MDPI and ACS Style

Godoy-Diana, R.; Vacher, J.; Raspa, V.; Thiria, B. On the Fluid Dynamical Effects of Synchronization in Side-by-Side Swimmers. Biomimetics 2019, 4, 77.

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