Subgrid-modelling in LES of Compressible Flow

A.W. Vreman, B.J. Geurts, J.G.M. Kuerten

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    Abstract

    Subgrid-models for Large Eddy Simulation (LES) of compressible turbulent flow are tested for the three-dimensional mixing layer. For the turbulent stress tensor the recently developed dynamic mixed model yields reasonable results. A priori estimates of the subgrid-terms in the filtered energy equation show that the usually neglected pressure-dilatation and turbulent dissipation rate are as large as the commonly retained pressure-velocity subgrid-term. Models for all these terms are proposed: a similarity model for the pressure-dilatation, similarity and k-dependent models for the turbulent dissipation rate and a dynamic mixed model for the pressure-velocity subgrid-term. Actual LES demonstrates that for a low Mach number all subgrid-terms in the energy equation can be neglected, while for a moderate Mach number the effect of the modelled turbulent dissipation rate is larger than the combined effect of the other modelled subgrid-terms in the filtered energy equation.
    Original languageEnglish
    Title of host publicationDirect and Large-Eddy Simulation I
    Subtitle of host publicationSelected papers from the First ERCOFTAC Workshop on Direct and Large-Eddy Simulation
    EditorsPeter R. Voke, Leonhard Kleiser, Jean-Pierre Chollet
    Place of PublicationDordrecht
    PublisherKluwer Academic Publishers
    Pages133-144
    Number of pages12
    ISBN (Electronic)978-94-011-1000-6
    ISBN (Print)978-94-010-4434-9
    DOIs
    Publication statusPublished - 13 Feb 1994
    Event1st ERCOFTAC Workshop on Direct and Large-Eddy Simulation I 1994 - The University of Surrey, Guildford, United Kingdom
    Duration: 27 Mar 199430 Mar 1994
    Conference number: 1

    Publication series

    NameFluid Mechanics and Its Applications
    PublisherKluwer Academic
    Volume26
    ISSN (Print)0926-5112

    Workshop

    Workshop1st ERCOFTAC Workshop on Direct and Large-Eddy Simulation I 1994
    CountryUnited Kingdom
    CityGuildford
    Period27/03/9430/03/94

    Keywords

    • Mach number
    • Large eddy simulation
    • Compressible flow
    • Turbulent stress
    • Turbulent dissipation rate

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