Comparison of DNS and LES of transitional and turbulent compressible flow: flat plate and mixing layer

Bernard Geurts, Bert Vreman, Hans Kuerten

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    Abstract

    We present a priori and a posteriori test results of LES (large eddy simulation) of compressible flow over a flat plate and in a mixing layer. Through a comparison with filtered DNS (direct numerical simulation) data the 'quality' of subgrid-models for the turbulent stress can be assessed. In particular, the scale similarity model of Bardina and the dynamic mixed model arising from a combination of Bardina's model with the Germano eddy-viscosity model show excellent correlations a priori, and give rise to accurate LES simulations a posteriori. Moreover, the filtering approach close to solid walls is considered and the contribution to the filtered equations arising from the non-commutation of the filter operator with the partial derivatives is calculated. It appears, in a priori tests for 2D simulations, that these non-commutation terms can be comparable to the turbulent stress. The scale similarity hypothesis yields models for these terms which show a good correlation.
    Original languageEnglish
    Title of host publicationApplication of Direct and Large Eddy simulation to transition and turbulence
    Subtitle of host publicationpapers presented at the 74th fluid dynamics symposium, Chania, Greece, April 1994
    PublisherAGARD
    Pages5/1-5/14
    Number of pages14
    ISBN (Print)92-836-0006-1
    Publication statusPublished - 1994
    Event74th Fluid Dynamics Symposium 1994 - Chania, Crete, Greece
    Duration: 18 Apr 199421 Apr 1994
    Conference number: 74

    Publication series

    NameAGARD Conference Proceedings
    PublisherAGARD
    Volume551
    ISSN (Print)0549-7191

    Conference

    Conference74th Fluid Dynamics Symposium 1994
    CountryGreece
    CityChania, Crete
    Period18/04/9421/04/94

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