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dc.contributor.authorFiscaletti, D.
dc.contributor.authorElsinga, G. E.
dc.contributor.authorAttili, Antonio
dc.contributor.authorBisetti, Fabrizio
dc.contributor.authorBuxton, O. R. H.
dc.date.accessioned2017-02-09T12:55:03Z
dc.date.available2017-02-09T12:55:03Z
dc.date.issued2016-10-24
dc.identifier.citationFiscaletti D, Elsinga GE, Attili A, Bisetti F, Buxton ORH (2016) Scale dependence of the alignment between strain rate and rotation in turbulent shear flow. Physical Review Fluids 1. Available: http://dx.doi.org/10.1103/PhysRevFluids.1.064405.
dc.identifier.issn2469-990X
dc.identifier.doi10.1103/PhysRevFluids.1.064405
dc.identifier.urihttp://hdl.handle.net/10754/622859
dc.description.abstractThe scale dependence of the statistical alignment tendencies of the eigenvectors of the strain-rate tensor e(i), with the vorticity vector omega, is examined in the self-preserving region of a planar turbulent mixing layer. Data from a direct numerical simulation are filtered at various length scales and the probability density functions of the magnitude of the alignment cosines between the two unit vectors vertical bar e(i) . (omega) over cap vertical bar are examined. It is observed that the alignment tendencies are insensitive to the concurrent large-scale velocity fluctuations, but are quantitatively affected by the nature of the concurrent large-scale velocity-gradient fluctuations. It is confirmed that the small-scale (local) vorticity vector is preferentially aligned in parallel with the large-scale (background) extensive strain-rate eigenvector e(1), in contrast to the global tendency for omega to be aligned in parallelwith the intermediate strain-rate eigenvector [Hamlington et al., Phys. Fluids 20, 111703 (2008)]. When only data from regions of the flow that exhibit strong swirling are included, the so-called high-enstrophy worms, the alignment tendencies are exaggerated with respect to the global picture. These findings support the notion that the production of enstrophy, responsible for a net cascade of turbulent kinetic energy from large scales to small scales, is driven by vorticity stretching due to the preferential parallel alignment between omega and nonlocal e(1) and that the strongly swirling worms are kinematically significant to this process.
dc.description.sponsorshipWe acknowledge valuable support from KAUST Supercomputing Laboratory in the form of assistance with code development and computational time on the IBM System Blue Gene/P
dc.publisherAmerican Physical Society (APS)
dc.relation.urlhttp://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.1.064405
dc.rightsArchived with thanks to Physical Review Fluids
dc.titleScale dependence of the alignment between strain rate and rotation in turbulent shear flow
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentReactive Flow Modeling Laboratory (RFML)
dc.identifier.journalPhysical Review Fluids
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionLaboratory for Aero and Hydrodynamics, Department of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, The Netherlands
dc.contributor.institutionEngineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom
dc.contributor.institutionInstitute for Combustion Technology, RWTH Aachen University, 52056 Aachen, Germany
dc.contributor.institutionDepartment of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, Texas 78712-1085, USA
dc.contributor.institutionDepartment of Aeronautics, Imperial College London, London SW7 2AZ, United Kingdom
kaust.personAttili, Antonio
kaust.personBisetti, Fabrizio
refterms.dateFOA2018-06-13T13:54:55Z


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