Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view

Abstract Symbiotic relationships have developed through natural evolution. For example, that of the remora fish attached to the body of a shark. From the remora’s perspective, this could be associated to an increased hydrodynamic efficiency in swimming and this needs to be investigated. To understan...

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Autores principales:	Yunxin Xu, Weichao Shi, Abel Arredondo-Galeana, Lei Mei, Yigit Kemal Demirel
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/78a035562a3d43168f381a3e13b7f88b
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id	oai:doaj.org-article:78a035562a3d43168f381a3e13b7f88b
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spelling	oai:doaj.org-article:78a035562a3d43168f381a3e13b7f88b2021-12-02T16:26:23ZUnderstanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view10.1038/s41598-021-94342-x2045-2322https://doaj.org/article/78a035562a3d43168f381a3e13b7f88b2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94342-xhttps://doaj.org/toc/2045-2322Abstract Symbiotic relationships have developed through natural evolution. For example, that of the remora fish attached to the body of a shark. From the remora’s perspective, this could be associated to an increased hydrodynamic efficiency in swimming and this needs to be investigated. To understand the remora's swimming strategy in the attachment state, a systematic study has been conducted using the commercial Computational Fluid Dynamics (CFD) software, STAR-CCM + to analyse and compare the resistance characteristics of the remora in attached swimming conditions. Two fundamental questions are addressed: what is the effect of the developed boundary layer flow and the effect of the adverse pressure gradient on the remora’s hydrodynamic characteristics? According to the results, the resistance of the remora can generally be halved when attached. Besides, the results have also demonstrated that the drag reduction rate increases with the developed boundary layer thickness and can be estimated using the boundary layer thickness ratio and velocity deficit. The paper demonstrates that the most frequent attachment locations are also the areas that provide the maximum drag reduction rate.Yunxin XuWeichao ShiAbel Arredondo-GaleanaLei MeiYigit Kemal DemirelNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-20 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yunxin Xu Weichao Shi Abel Arredondo-Galeana Lei Mei Yigit Kemal Demirel Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view
description	Abstract Symbiotic relationships have developed through natural evolution. For example, that of the remora fish attached to the body of a shark. From the remora’s perspective, this could be associated to an increased hydrodynamic efficiency in swimming and this needs to be investigated. To understand the remora's swimming strategy in the attachment state, a systematic study has been conducted using the commercial Computational Fluid Dynamics (CFD) software, STAR-CCM + to analyse and compare the resistance characteristics of the remora in attached swimming conditions. Two fundamental questions are addressed: what is the effect of the developed boundary layer flow and the effect of the adverse pressure gradient on the remora’s hydrodynamic characteristics? According to the results, the resistance of the remora can generally be halved when attached. Besides, the results have also demonstrated that the drag reduction rate increases with the developed boundary layer thickness and can be estimated using the boundary layer thickness ratio and velocity deficit. The paper demonstrates that the most frequent attachment locations are also the areas that provide the maximum drag reduction rate.
format	article
author	Yunxin Xu Weichao Shi Abel Arredondo-Galeana Lei Mei Yigit Kemal Demirel
author_facet	Yunxin Xu Weichao Shi Abel Arredondo-Galeana Lei Mei Yigit Kemal Demirel
author_sort	Yunxin Xu
title	Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view
title_short	Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view
title_full	Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view
title_fullStr	Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view
title_full_unstemmed	Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view
title_sort	understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/78a035562a3d43168f381a3e13b7f88b
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Understanding of remora's “hitchhiking” behaviour from a hydrodynamic point of view

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