Dynamics of large turbulent structures in a steady breaker

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dc.contributor.author Rodríguez-Rodríguez, Javier
dc.contributor.author Marugán Cruz, Carolina
dc.contributor.author Aliseda, Alberto
dc.contributor.author Lasheras, Juan Carlos
dc.date.accessioned 2012-02-16T09:55:36Z
dc.date.accessioned 2012-02-27T11:07:44Z
dc.date.available 2012-02-27T11:07:44Z
dc.date.issued 2011-02-02
dc.identifier.bibliographicCitation Experimental Thermal and Fluid Science, 2011, vol. 35, nº 2, p. 301-310
dc.identifier.issn 0894-1777
dc.identifier.uri http://hdl.handle.net/10016/13379
dc.description.abstract The flow near the leading edge of a steady breaker has been studied experimentally using Bubble Image Velocimetry (BIV) with the aim of characterizing the dynamics of the large eddies responsible for air entrainment. It is well reported in the literature, and confirmed by our measurements of the instantaneous velocity field, that this flow shares some important features with the turbulent shear-layer formed between two parallel semi-infinite streams with different velocities. Namely, the formation of a periodic array of coherent vortices, the constant convective velocity of those vortices, the linear relation between their size and their downstream position and the self-similar structure of both mean velocity profiles and Reynolds shear stresses. Nonetheless, important differences exists between the dynamics of the large eddies in a steady breaker and those in a free shear-layer. Particularly, the convective velocity of these large structures is slower in a steady breaker and, consistent with this, their growth rates are larger. A physical interpretation of these differences is provided together with a discussion of their implications. To support our measurements and conclusions, we present a careful analysis of the accuracy of the BIV technique in turbulent flows with large bubbles
dc.description.sponsorship The authors wish to thank Professor Emil J. Hopfinger for his valuable suggestions on the interpretation of the experimental data. This work was supported by the ONR through Grant N00014-05-1-0121 and by the Spanish Ministry of Science (MICINN) through Grant DPI2008-06369
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language.iso eng
dc.publisher Elsevier
dc.rights © Elsevier
dc.subject.other Steady breakers
dc.subject.other Hydraulic jumps
dc.subject.other Turbulent flows
dc.subject.other Large eddies
dc.title Dynamics of large turbulent structures in a steady breaker
dc.type article
dc.description.status Publicado
dc.relation.publisherversion http://dx.doi.org/10.1016/j.expthermflusci.2010.09.012
dc.subject.eciencia Ingeniería Industrial
dc.subject.eciencia Física
dc.identifier.doi 10.1016/j.expthermflusci.2010.09.012
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 301
dc.identifier.publicationissue 2
dc.identifier.publicationlastpage 310
dc.identifier.publicationtitle Experimental Thermal and Fluid Science
dc.identifier.publicationvolume 35
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