On the response of a water surface to a surface pressure source moving at trans-critical gravity-capillary wave speeds

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dc.contributor.authorMasnadi, Naeemko
dc.contributor.authorCho, Yeun Wooko
dc.contributor.authorDuncan, James Hko
dc.contributor.authorAkylas, Triantaphyllosko
dc.date.accessioned2016-04-20T05:18:34Z-
dc.date.available2016-04-20T05:18:34Z-
dc.date.created2015-12-14-
dc.date.issued2015-11-23-
dc.identifier.citation68th Annual Meeting of the APS Division of Fluid Dynamics-
dc.identifier.urihttp://hdl.handle.net/10203/204858-
dc.description.abstractThe non-linear response of a water free surface to a pressure source moving at speeds near the minimum speed of linear gravity-capillary waves (C min ≈23 cm/s) is investigated with experiments and theory. In the experiments, waves are generated by a vertically oriented air-jet that moves at a constant speed over the water surface in a long tank. The 3-D surface shape behind the air-jet is measured using a cinematic refraction-based technique combined with an LIF technique. At towing speeds just below C min , an unsteady pattern is formed where localized depressions periodically appear in pairs and move away from the source along the arms of a downstream V-shaped pattern. This behavior is analogous to the periodic shedding of solitary waves upstream of a source moving at the maximum wave speed in shallow water. The gravity-capillary depressions are rapidly damped by viscosity and their speed-amplitude characteristics closely match those from inviscid calculations of gravity-capillary lumps. The shedding frequency of the lumps in the present experiments increases with both increasing towing speed and air-flow rate. Predictions of this behavior using a model equation that incorporates damping and a quadratic nonlinearity are in good agreement with the experiments.-
dc.languageEnglish-
dc.publisherAPS (American Physical Society)-
dc.titleOn the response of a water surface to a surface pressure source moving at trans-critical gravity-capillary wave speeds-
dc.typeConference-
dc.type.rimsCONF-
dc.citation.publicationname68th Annual Meeting of the APS Division of Fluid Dynamics-
dc.identifier.conferencecountryUS-
dc.identifier.conferencelocationHynes Convention Center, Boston, MA-
dc.contributor.localauthorCho, Yeun Woo-
dc.contributor.nonIdAuthorMasnadi, Naeem-
dc.contributor.nonIdAuthorDuncan, James H-
dc.contributor.nonIdAuthorAkylas, Triantaphyllos-
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ME-Conference Papers(학술회의논문)
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