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dc.contributorVirginia Techen_US
dc.contributor.authorRagab, Saad A.en_US
dc.contributor.authorSreedhar, M.en_US
dc.date.accessioned2014-04-24T18:34:17Z
dc.date.available2014-04-24T18:34:17Z
dc.date.issued1995-03-01
dc.identifier.citationRagab, S.; Sreedhar, M., "numerical simulation of vortices with axial velocity deficits," Phys. Fluids 7, 549 (1995); http://dx.doi.org/10.1063/1.868582
dc.identifier.issn1070-6631
dc.identifier.urihttp://hdl.handle.net/10919/47647
dc.description.abstractAxial velocity deficit is a source of instability in vortices that may otherwise be stable. Temporal large‐eddy simulation is performed to study the response of vortices with axial velocity deficits to random and controlled disturbances at high Reynolds numbers. The qvortex [Batchelor, J. Fluid Mech. 20, 321 (1964)] is used as a model of such vortices. When the vortex is linearly unstable, the disturbances grow and result in the appearance of large‐scale helical sheets of vorticity. Later, these large‐scale helical structures break up into small‐scale filaments. Associated with the formation of the large‐scale structures is a redistribution of both angular and axial momentum between the core and the surroundings. The redistribution weakens the axial velocity deficit in the core while strengthens the rigid‐body‐like rotation of the core. The emerging mean velocity profiles drive the vortex core to a stable configuration. The vortex eventually returns to a laminar state, with an insignificant decay in the tangential velocity, but with a much weakened axial velocity deficit. A direct numerical simulation obtained at a lower Reynolds number confirms the above conclusions.
dc.description.sponsorshipOffice of Naval Research N00014-92-J-4087
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_US
dc.publisherAIP Publishing
dc.subjectTrailing line vortexen_US
dc.subjectStabilityen_US
dc.subjectInstabilityen_US
dc.titleNumerical Simulation of Vortices with Axial Velocity Deficitsen_US
dc.typeArticleen_US
dc.identifier.urlhttp://scitation.aip.org/content/aip/journal/pof2/7/3/10.1063/1.868582
dc.date.accessed2014-04-04
dc.title.serialPhysics of Fluids
dc.identifier.doihttps://doi.org/10.1063/1.868582
dc.type.dcmitypeTexten_US


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