Hydroelastic effects during the fast lifting of a disc from a water surface

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dc.contributor.author Vega Martínez, Patricia
dc.contributor.author Rodríguez Rodríguez, Francisco Javier
dc.contributor.author Khabakhpasheva, Tatjana I.
dc.contributor.author Korobkin, Alexander A.
dc.date.accessioned 2021-05-19T07:51:22Z
dc.date.available 2021-05-19T07:51:22Z
dc.date.issued 2019-06-25
dc.identifier.bibliographicCitation Vega-Martínez, P., Rodríguez-Rodríguez, J., Khabakhpasheva, T. I. & Korobkin, A. A. (2019). Hydroelastic effects during the fast lifting of a disc from a water surface. Journal of Fluid Mechanics, vol. 869, pp. 726–751.
dc.identifier.issn 0022-1120
dc.identifier.uri http://hdl.handle.net/10016/32670
dc.description.abstract Here we report the results of an experimental study where we measure the hydrodynamic force acting on a plate which is lifted from a water surface, suddenly starting to move upwards with an acceleration much larger than gravity. Our work focuses on the early stage of the plate motion, when the hydrodynamic suction forces due to the liquid inertia are the most relevant ones. Besides the force, we measure as well the acceleration at the centre of the plate and the time evolution of the wetted area. The results of this study show that, at very early stages, the hydrodynamic force can be estimated by a simple extension of the linear exit theory by Korobkin (J. Fluid Mech., vol. 737, 2013, pp. 368-386), which incorporates an added mass to the body dynamics. However, at longer times, the measured acceleration decays even though the applied external force continues to increase. Moreover, high-speed recordings of the disc displacement and the radius of the wetted area reveal that the latter does not change before the disc acceleration reaches its maximum value. We show in this paper that these phenomena are caused by the elastic deflection of the disc during the initial transient stage of water exit. We present a linearised model of water exit that accounts for the elastic behaviour of the lifted body. The results obtained with this new model agree fairly well with the experimental results.
dc.description.sponsorship P.V.-M. and J.R.-R. acknowledge the work of the Spanish Ministry of Economy and Competitiveness through grants DPI2014-59292-C3-1-P, DPI2015-71901-REDT and DPI2017-88201-C3-3-R, partly funded by European funds. T.I.K. and A.A.K. are supported by the NICOP research grant "Vertical penetration of an object through broken ice and floating ice plate" N62909-17-1-2128, through Dr S. Ahmed. A.A.K. thanks Universidad Carlos III de Madrid and Banco Santander for financial support from a Chair of Excellence.
dc.format.extent 26
dc.language.iso eng
dc.publisher Cambridge University Press
dc.rights © 2019 Cambridge University Press
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Flow-structure interactions
dc.title Hydroelastic effects during the fast lifting of a disc from a water surface
dc.type article
dc.subject.eciencia Energías Renovables
dc.identifier.doi https://doi.org/10.1017/jfm.2019.208
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. DPI2014-59292-C3-1-P
dc.relation.projectID Gobierno de España. DPI2017-88201-C3-3-R
dc.relation.projectID Gobierno de España. DPI2015-71901-REDT
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 726
dc.identifier.publicationlastpage 751
dc.identifier.publicationtitle Journal of Fluid Mechanics
dc.identifier.publicationvolume 869
dc.identifier.uxxi AR/0000027391
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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