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    Statistics and scaling of turbulence in a spatially developing mixing layer at Reλ = 250

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    Type
    Article
    Authors
    Attili, Antonio
    Bisetti, Fabrizio cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Reactive Flow Modeling Laboratory (RFML)
    Date
    2012-03-21
    Online Publication Date
    2012-03-21
    Print Publication Date
    2012-03
    Permanent link to this record
    http://hdl.handle.net/10754/552109
    
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    Abstract
    The 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.
    Citation
    Statistics and scaling of turbulence in a spatially developing mixing layer at Reλ = 250 2012, 24 (3):035109 Physics of Fluids
    Publisher
    AIP Publishing
    Journal
    Physics of Fluids
    DOI
    10.1063/1.3696302
    Additional Links
    http://scitation.aip.org/content/aip/journal/pof2/24/3/10.1063/1.3696302
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.3696302
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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