The Three-Dimensional Interaction of a Vortex Pair with a Wall

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dc.contributorVirginia Techen
dc.contributor.authorLuton, J. A.en
dc.contributor.authorRagab, Saad A.en
dc.contributor.departmentBiomedical Engineering and Mechanicsen
dc.date.accessed2014-04-04en
dc.date.accessioned2014-04-24T18:34:21Zen
dc.date.available2014-04-24T18:34:21Zen
dc.date.issued1997-10-01en
dc.description.abstractThe interaction of vortices passing near a solid surface has been examined using direct numerical simulation. The configuration studied is a counter-rotating vortex pair approaching a wall in an otherwise quiescent fluid. The focus of these simulations is on the three-dimensional effects, of which little is known. To the authors' knowledge, this is the first three-dimensional simulation that lends support to the short-wavelength instability of the secondary vortex. It has been shown how this Crow-type instability leads to three dimensionality after the rebound of a vortex pair. The growth of the instability of the secondary vortex in the presence of the stronger primary vortex leads to the turning and intense stretching of the secondary vortex. As the instability grows the secondary vortex is bent, stretched, and wrapped around the stronger primary. During this process reconnection was observed between the two secondary vortices. Reconnection also begins between the primary and secondary vortices but the weaker secondary vortex dissipates before the primary, leaving reconnection incomplete. Evidence is presented for a new type of energy cascade based on the short-wavelength instability and the formation of continual smaller vortices at the wall. Ultimately the secondary vortex is destroyed by stretching and dissipation leaving the primary vortex with a permanently distorted shape but relatively unaffected strength compared to an isolated vortex. (C) 1997 American Institute of Physics.en
dc.description.sponsorshipOffice of Naval Research N00014-92-J-4087en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationLuton, J. A.; Ragab, S. A., "the three-dimensional interaction of a vortex pair with a wall," Phys. Fluids 9, 2967 (1997); http://dx.doi.org/10.1063/1.869408en
dc.identifier.doihttps://doi.org/10.1063/1.869408en
dc.identifier.issn1070-6631en
dc.identifier.urihttp://hdl.handle.net/10919/47668en
dc.identifier.urlhttp://scitation.aip.org/content/aip/journal/pof2/9/10/10.1063/1.869408en
dc.language.isoen_USen
dc.publisherAIP Publishingen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectFree surfacesen
dc.subjectRingsen
dc.subjectTubesen
dc.subjectReconnectionen
dc.subjectVorticesen
dc.subjectInstabilityen
dc.subjectSeparationen
dc.subjectStabilityen
dc.subjectBehavioren
dc.subjectBoundaryen
dc.titleThe Three-Dimensional Interaction of a Vortex Pair with a Wallen
dc.title.serialPhysics of Fluidsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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