On the use of embedded meshes in the les of external flows

Y. Addad, R. Prosser, D. Laurence, S. Moreau, F. Mendonca

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    18 Scopus citations

    Abstract

    In the present study, the possibility of performing cheap and accurate LES computations using unstructured grids on complex geometries has been examined. The test case considered is a turbulent flow around a thin controlled diffusion airfoil at low speed, with angle of attack of 8° to the incoming free-stream flow. The flow velocity is set to satisfy the chord Reynolds number of 1.2∈×∈105. Two subgrid models are tested; the classical Smagorinsky model and the WALE model. The predictions are found to be in good agreement with the experimental data both in terms of flow dynamics and pressure spectra. The results are found to be independent of the LES physical models tested herein, although this conclusion is issued with the caveat that a careful grid generation procedure using (2:3 and 3:4 type) refinements was required to reduce the jump size across the different grid resolutions.

    Original languageBritish English
    Pages (from-to)393-403
    Number of pages11
    JournalFlow, Turbulence and Combustion
    Volume80
    Issue number3
    DOIs
    StatePublished - Apr 2008

    Keywords

    • Aeroacoustics
    • LES
    • Smagorinsky Model
    • Star-CD
    • Thin airfoil
    • WALE model

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