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Fluid-structure resonance in spanwise-flexible flapping wings

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dc.affiliation.dptoUC3M. Departamento de Ingeniería Aeroespaciales
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Ingeniería Aeroespaciales
dc.contributor.authorMartínez Muriel, Cayetano
dc.contributor.authorArranz, G.
dc.contributor.authorGarcía-Villalba Navaridas, Manuel
dc.contributor.authorFlores Arias, Óscar
dc.contributor.funderMinisterio de Economía y Competitividad (España)es
dc.date.accessioned2023-12-01T17:03:48Z
dc.date.available2023-12-01T17:03:48Z
dc.date.issued2023-05-26
dc.description.abstractWe report direct numerical simulations of the flow around a spanwise-flexible wing in forward flight. The simulations were performed at Re = 1000 for wings of aspect ratio 2 and 4 undergoing a heaving and pitching motion at Strouhal number Stc ≈ 0.5. We have varied the effective stiffness of the wing Π1 while keeping the effective inertia constant, Π0 = 0.1. It has been found that there is an optimal aerodynamic performance of the wing linked to a damped resonance phenomenon, that occurs when the imposed frequency of oscillation approaches the first natural frequency of the structure in the fluid, ωn,f /ω ≈ 1. In that situation, the time-averaged thrust is maximum, increasing by factor 2 with respect to the rigid case with an increase in propulsive efficiency of approximately 15 %. This enhanced aerodynamic performance results from the combination of larger effective angles of attack of the outboard wing sections and a delayed development of the leading-edge vortex. With increasing flexibility beyond the resonant frequency, the aerodynamic performance drops significantly, in terms of both thrust production and propulsive efficiency. The cause of this drop lies in the increasing phase lag between the deflection of the wing and the heaving/pitching motion, which results in weaker leading-edge vortices, negative effective angles of attack in the outboard sections of the wing, and drag generation in the first half of the stroke. Our results also show that flexible wings with the same ωn,f /ω but different aspect ratio have the same aerodynamic performance, emphasizing the importance of the structural properties of the wing for its aerodynamic performance.en
dc.description.sponsorshipFunding. This work was partially supported by grant DPI2016-76151-C2-2-R (AEI/FEDER, UE).en
dc.description.statusPublicadoes
dc.format.extent24
dc.identifier.bibliographicCitationMartínez-Muriel, C., Arranz, G., García-Villalba, M., & Flores, O. (2023). Fluid–structure resonance in spanwise-flexible flapping wings. Journal of Fluid Mechanics, 964, A5 (24p.). doi:10.1017/jfm.2023.308en
dc.identifier.doihttps://doi.org/10.1017/jfm.2023.308
dc.identifier.issn0022-1120
dc.identifier.publicationfirstpage1
dc.identifier.publicationlastpage24
dc.identifier.publicationtitleJournal of Fluid Mechanicsen
dc.identifier.publicationvolume964, A5
dc.identifier.urihttps://hdl.handle.net/10016/39021
dc.identifier.uxxiAR/0000033559
dc.language.isoengen
dc.publisherCambridge University Pressen
dc.relation.projectIDGobierno de España. DPI2016-76151-C2-2-Res
dc.rights© The Author(s), 2023. Published by Cambridge University Pressen
dc.rightsThis is an Open Access article, distributed under the terms of the Creative Commons Attribution licence, which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.en
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsopen accessen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.ecienciaAeronáuticaes
dc.subject.otherFlow-Structure Interactionsen
dc.subject.otherSwimming/Flyingen
dc.titleFluid-structure resonance in spanwise-flexible flapping wingsen
dc.typeresearch article*
dc.type.hasVersionVoR*
dspace.entity.typePublication
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