Alpha-modeling strategy for LES of turbulent mixing

Bernard J. Geurts, Darryl D. Holm

    Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

    10 Citations (Scopus)

    Abstract

    The α-modeling strategy is followed to derive a new subgrid parameterization of the turbulent stress tensor in large-eddy simulation (LES). The LES-α modeling yields an explicitly filtered subgrid parameterization which contains the filtered nonlinear gradient model as well as a model which represents Leray-regularization. The LES-α model is compared with similarity and eddy-viscosity models that also use the dynamic procedure. Numerical simulations of a turbulent mixing layer are performed using both a second order, and a fourth order accurate finite volume discretization. The Leray model emerges as the most accurate, robust and computationally efficient among the three LES-α subgrid parameterizations for the turbulent mixing layer. The evolution of the resolved kinetic energy is analyzed and the various subgrid-model contributions to it are identified. By comparing LES-α at different subgrid resolutions, an impression of finite volume discretization error dynamics is obtained.
    Original languageEnglish
    Title of host publicationTurbulent Flow Computation
    EditorsD. Drikakis, B.J. Geurts
    Place of PublicationDordrecht
    PublisherKluwer Academic Publishers
    Pages237-278
    ISBN (Electronic)978-0-306-48421-6
    ISBN (Print)978-1-4020-0523-7
    DOIs
    Publication statusPublished - 2002

    Publication series

    NameFluid Mechanics and Its Applications
    PublisherKluwer
    Volume66
    ISSN (Print)0926-5112

    Keywords

    • METIS-205846

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