How wavelength affects hydrodynamic performance of two accelerating mirror-symmetric undulating hydrofoils

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dc.contributor.authorLin, Zhonglu
dc.contributor.authorLiang, Dongfang
dc.contributor.authorBhalla, Amneet Pal Singh
dc.contributor.authorSheikh Al-Shabab, Ahmed A.
dc.contributor.authorSkote, Martin
dc.contributor.authorZheng, Wei
dc.contributor.authorZhang, Yu
dc.date.accessioned2023-08-14T09:46:14Z
dc.date.available2023-08-14T09:46:14Z
dc.date.issued2023-08-02
dc.description.abstractFish schools are capable of simultaneous linear acceleration. To reveal the underlying hydrodynamic mechanism, we numerically investigate how Reynolds number Re ¼ 1000–2000, Strouhal number St ¼ 0:2–0:7, and wavelength k ¼ 0:5–2 affect the mean net thrust and net propulsive efficiency of two side-by-side hydrofoils undulating in anti-phase. In total, 550 cases are simulated using immersed boundary method. The thrust increases significantly with the wavelength and the Strouhal number, yet only slightly with the Reynolds number. We apply a symbolic regression algorithm to formulate this relationship. Furthermore, we find that mirror-symmetric schooling can achieve a net thrust more than ten times that of a single swimmer, especially at low Reynolds numbers. The highest efficiency is obtained at St ¼ 0:5 and k ¼ 1:2, where St is consistent with that observed in the linear-accelerating natural swimmers, e.g., Crevalle jack. Six distinct flow structures are identified. The highest thrust corresponds to an asymmetric flow pattern, whereas the highest efficiency occurs when the flow is symmetric with converging vortex streets.en_UK
dc.identifier.citationLin Z, Liang D, Bhalla APS, et al., (2023) How wavelength affects hydrodynamic performance of two accelerating mirror-symmetric undulating hydrofoils. Physics of Fluids, Volume 35, Issue 8, August 2023, Article number 081901en_UK
dc.identifier.issn1070-6631
dc.identifier.urihttps://doi.org/10.1063/5.0155661
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20077
dc.language.isoenen_UK
dc.publisherAmerican Institute of Physics (AIP)en_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleHow wavelength affects hydrodynamic performance of two accelerating mirror-symmetric undulating hydrofoilsen_UK
dc.typeArticleen_UK

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