Flow interaction of three-dimensional self-propelled flexible plates in tandem

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dc.contributor.author Arranz Fernandez, Gonzalo
dc.contributor.author Flores Arias, Óscar
dc.contributor.author García-Villalba Navaridas, Manuel
dc.date.accessioned 2022-02-11T12:40:56Z
dc.date.available 2022-02-11T12:40:56Z
dc.date.issued 2021-11-22
dc.identifier.bibliographicCitation Arranz; G., Flores, O., García Villalba, M. (2022). Flow interaction of three-dimensional self-propelled flexible plates in tandem. Journal of Fluid Mechanics, 931, A5
dc.identifier.issn 0022-1120
dc.identifier.uri http://hdl.handle.net/10016/34108
dc.description.abstract Tandem configurations of two self-propelled flexible flappers of finite span are explored by means of numerical simulations. The same sinusoidal vertical motion is imposed on the leading edge of both flappers, but with a phase shift (φ). In addition, a vertical offset, H, is prescribed between the flappers. The configurations that emerge are characterized in terms of their hydrodynamic performance and topology. The flappers reach a stable configuration with a constant mean propulsive speed and a mean equilibrium horizontal distance. Depending on H and φ, two different tandem configurations are observed, namely compact and regular configurations. The performance of the upstream flapper (i.e. the leader) is virtually equal to the performance of an isolated flapper, except in the compact configuration, where the close interaction with the downstream flapper (i.e. the follower) results in higher power requirements and propulsive speed than an isolated flapper. Conversely, the follower’s performance is significantly affected by the wake of the leader in both regular and compact configurations. The analysis of the flow shows that the follower’s performance is influenced by the interaction with the vertical jet induced by the vortex rings shed by the leader. This interaction can be beneficial or detrimental for the follower’s performance, depending on the alignment of the jet velocity with the follower’s vertical motion. Finally, a qualitative prediction of the performance of a hypothetical follower is presented. The model is semi-empirical, and it uses the flow field of an isolated flapper.
dc.description.sponsorship This work was supported by the State Research Agency of Spain (AEI) under grant DPI2016-76151-C2-2-R including funding from the European Regional Development Fund (ERDF). The computations were partially performed at the supercomputer Caesaraugusta from the Red Española de Supercomputación in activity IM-2020-2-0005
dc.language.iso eng
dc.publisher Cambridge University Press
dc.rights © The Author(s), 2021.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Swimming/flying
dc.subject.other Flow-structure Interactions
dc.subject.other Vortex interactions
dc.title Flow interaction of three-dimensional self-propelled flexible plates in tandem
dc.type article
dc.subject.eciencia Ingeniería Mecánica
dc.identifier.doi https://doi.org/10.1017/jfm.2021.918
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. DPI2016-76151-C2-2-R
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationlastpage 25
dc.identifier.publicationtitle JOURNAL OF FLUID MECHANICS
dc.identifier.publicationvolume 931
dc.identifier.uxxi AR/0000029409
dc.contributor.funder Ministerio de Asuntos Económicos y Transformación Digital (España)
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