The performance of a flapping foil for a self-propelled fishlike body

Abstract Several fish species propel by oscillating the tail, while the remaining part of the body essentially contributes to the overall drag. Since in this case thrust and drag are in a way separable, most attention was focused on the study of propulsive efficiency for flapping foils under a presc...

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Autores principales:	Damiano Paniccia, Luca Padovani, Giorgio Graziani, Renzo Piva
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/105b9ad0b4c74da1ae82186632a3712a
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spelling	oai:doaj.org-article:105b9ad0b4c74da1ae82186632a3712a2021-11-21T12:23:30ZThe performance of a flapping foil for a self-propelled fishlike body10.1038/s41598-021-01730-42045-2322https://doaj.org/article/105b9ad0b4c74da1ae82186632a3712a2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01730-4https://doaj.org/toc/2045-2322Abstract Several fish species propel by oscillating the tail, while the remaining part of the body essentially contributes to the overall drag. Since in this case thrust and drag are in a way separable, most attention was focused on the study of propulsive efficiency for flapping foils under a prescribed stream. We claim here that the swimming performance should be evaluated, as for undulating fish whose drag and thrust are severely entangled, by turning to self-propelled locomotion to find the proper speed and the cost of transport for a given fishlike body. As a major finding, the minimum value of this quantity corresponds to a locomotion speed in a range markedly different from the one associated with the optimal efficiency of the propulsor. A large value of the feathering parameter characterizes the minimum cost of transport while the optimal efficiency is related to a large effective angle of attack. We adopt here a simple two-dimensional model for both inviscid and viscous flows to proof the above statements in the case of self-propelled axial swimming. We believe that such an easy approach gives a way for a direct extension to fully free swimming and to real-life configurations.Damiano PanicciaLuca PadovaniGiorgio GrazianiRenzo PivaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Damiano Paniccia Luca Padovani Giorgio Graziani Renzo Piva The performance of a flapping foil for a self-propelled fishlike body
description	Abstract Several fish species propel by oscillating the tail, while the remaining part of the body essentially contributes to the overall drag. Since in this case thrust and drag are in a way separable, most attention was focused on the study of propulsive efficiency for flapping foils under a prescribed stream. We claim here that the swimming performance should be evaluated, as for undulating fish whose drag and thrust are severely entangled, by turning to self-propelled locomotion to find the proper speed and the cost of transport for a given fishlike body. As a major finding, the minimum value of this quantity corresponds to a locomotion speed in a range markedly different from the one associated with the optimal efficiency of the propulsor. A large value of the feathering parameter characterizes the minimum cost of transport while the optimal efficiency is related to a large effective angle of attack. We adopt here a simple two-dimensional model for both inviscid and viscous flows to proof the above statements in the case of self-propelled axial swimming. We believe that such an easy approach gives a way for a direct extension to fully free swimming and to real-life configurations.
format	article
author	Damiano Paniccia Luca Padovani Giorgio Graziani Renzo Piva
author_facet	Damiano Paniccia Luca Padovani Giorgio Graziani Renzo Piva
author_sort	Damiano Paniccia
title	The performance of a flapping foil for a self-propelled fishlike body
title_short	The performance of a flapping foil for a self-propelled fishlike body
title_full	The performance of a flapping foil for a self-propelled fishlike body
title_fullStr	The performance of a flapping foil for a self-propelled fishlike body
title_full_unstemmed	The performance of a flapping foil for a self-propelled fishlike body
title_sort	performance of a flapping foil for a self-propelled fishlike body
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/105b9ad0b4c74da1ae82186632a3712a
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The performance of a flapping foil for a self-propelled fishlike body

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