Numerical Simulation of Vortices with Axial Velocity Deficits

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dc.contributorVirginia Techen
dc.contributor.authorRagab, Saad A.en
dc.contributor.authorSreedhar, M.en
dc.contributor.departmentBiomedical Engineering and Mechanicsen
dc.date.accessed2014-04-04en
dc.date.accessioned2014-04-24T18:34:17Zen
dc.date.available2014-04-24T18:34:17Zen
dc.date.issued1995-03-01en
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.en
dc.description.sponsorshipOffice of Naval Research N00014-92-J-4087en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationRagab, S.; Sreedhar, M., "numerical simulation of vortices with axial velocity deficits," Phys. Fluids 7, 549 (1995); http://dx.doi.org/10.1063/1.868582en
dc.identifier.doihttps://doi.org/10.1063/1.868582en
dc.identifier.issn1070-6631en
dc.identifier.urihttp://hdl.handle.net/10919/47647en
dc.identifier.urlhttp://scitation.aip.org/content/aip/journal/pof2/7/3/10.1063/1.868582en
dc.language.isoen_USen
dc.publisherAIP Publishingen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectTrailing line vortexen
dc.subjectStabilityen
dc.subjectInstabilityen
dc.titleNumerical Simulation of Vortices with Axial Velocity Deficitsen
dc.title.serialPhysics of Fluidsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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