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dc.contributor.authorAttili, Antonio
dc.contributor.authorBisetti, Fabrizio
dc.date.accessioned2015-05-03T14:25:55Z
dc.date.available2015-05-03T14:25:55Z
dc.date.issued2012-03-21
dc.identifier.citationStatistics and scaling of turbulence in a spatially developing mixing layer at Reλ = 250 2012, 24 (3):035109 Physics of Fluids
dc.identifier.issn10706631
dc.identifier.doi10.1063/1.3696302
dc.identifier.urihttp://hdl.handle.net/10754/552109
dc.description.abstractThe turbulent flow originating from the interaction between two parallel streams with different velocities is studied by means of direct numerical simulation. Rather than the more common temporal evolving layer, a spatially evolving configuration, with perturbed laminar inlet conditions is considered. The streamwise evolution and the self-similar state of turbulence statistics are reported and compared to results available in the literature. The characteristics of the transitional region agree with those observed in other simulations and experiments of mixing layers originating from laminar inlets. The present results indicate that the transitional region depends strongly on the inlet flow. Conversely, the self-similar state of turbulent kinetic energy and dissipation agrees quantitatively with those in a temporal mixing layer developing from turbulent initial conditions [M. M. Rogers and R. D. Moser, “Direct simulation of a self-similar turbulent mixing layer,” Phys. Fluids6, 903 (1994)]. The statistical features of turbulence in the self-similar region have been analysed in terms of longitudinal velocity structure functions, and scaling exponents are estimated by applying the extended self-similarity concept. In the small scale range (60 < r/η < 250), the scaling exponents display the universal anomalous scaling observed in homogeneous isotropic turbulence. The hypothesis of isotropy recovery holds in the turbulent mixing layer despite the presence of strong shear and large-scale structures, independently of the means of turbulence generation. At larger scales (r/η > 400), the mean shear and large coherent structures result in a significant deviation from predictions based on homogeneous isotropic turbulence theory. In this second scaling range, the numerical values of the exponents agree quantitatively with those reported for a variety of other flows characterized by strong shear, such as boundary layers, as well as channel and wake flows.
dc.publisherAIP Publishing
dc.relation.urlhttp://scitation.aip.org/content/aip/journal/pof2/24/3/10.1063/1.3696302
dc.rightsArchived with thanks to Physics of Fluids. © 2012 American Institute of Physics .[ http://dx.doi.org/10.1063/1.3696302 ]
dc.titleStatistics and scaling of turbulence in a spatially developing mixing layer at Reλ = 250
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.journalPhysics of Fluids
dc.eprint.versionPublisher's Version/PDF
kaust.personAttili, Antonio
kaust.personBisetti, Fabrizio
refterms.dateFOA2013-03-21T00:00:00Z
dc.date.published-online2012-03-21
dc.date.published-print2012-03


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