Regularization modeling for LES of separated boundary layer flow

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    Abstract

    Regularization models for the turbulent stress tensor are applied to mixing and separated boundary layers. The Leray and the NS-a models in large-eddy simulation (LES) are compared to direct numerical simulation (DNS) and (dynamic) eddy-viscosity models. These regularization models are at least as accurate as the dynamic eddy-viscosity model, and can be derived from an underlying dynamic principle. This allows one to maintain central transport properties of the Navier-Stokes equations in the model and to extend systematically toward complex applications. The NS-a model accurately represents the small-scale variability, albeit at considerable resolution. The Leray model was found to be much more robust, allowing simulations at high Reynolds number. Leray simulations of a separated boundary layer are shown for the first time. The strongly localized transition to turbulence that arises under a blowing and suction region over a flat plate was captured accurately, quite comparable to the dynamic model. In contrast, results obtained with the Smagorinsky model, either with or without Van Driest damping, yield considerable errors, due to its excessive dissipation.
    Original languageUndefined
    Article number10.1016/j.jfluidstructs.2008.08.006
    Pages (from-to)1176-1184
    Number of pages9
    JournalJournal of fluids and structures
    Volume24
    Issue number2008/16200/8
    DOIs
    Publication statusPublished - 2008

    Keywords

    • Turbulence
    • Separated flow
    • Eddy-viscosity
    • IR-62648
    • Large eddy simulation
    • EWI-14727
    • METIS-255054
    • Regularization models

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