Large-eddy simulation/Reynolds-averaged Navier-Stokes (LES/RANS) hybrid methodology is applied to a high-Reynolds-number supersonic axisymmetric base flow. Accurate predictions of the base flowfield and base pressure are successfully achieved by using the LES/RANS hybrid methodology with less computational cost than that of pure LES and monotone integrated large-eddy simulation (MILES) approaches. Both the efficiency and reliability of the present LES/RANS hybrid methodology for the prediction of massively separated high-Reynolds-number flows an identified by comparison with the results obtained by LES, MILES, RANS, and the experiments in detail. The LES/RANS hybrid simulation accurately resolves the physics of unsteady turbulent motions, such as shear-layer rollup, large-eddy motions in the downstream region, small-eddy motions inside the recirculating region, and formation of large mushroom-shaped patterns in the end view. Comparison of the results shows that it is necessary to resolve approaching boundary layers and free shear-layer velocity profiles from the base edge correctly for the accurate prediction of base flows. Given the required mesh resolution near solid surfaces for pure LES and MILES at high-Reynolds-number flows, reduction of the computational cost is considerable when using the LES/RANS hybrid methodology. The consideration of a Smagorinsky constant for a compressible flow analysis may suggest that the optimal value of Smagorinsky constant may be larger in the flows with strong compressibility than in incompressible flows.


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    Title :

    Computational study of supersonic base flow using hybrid turbulence methodology


    Additional title:

    Numerische Simulation der Überschallströmung hinter einem rotationssymmetrischen Körper unter Verwendung eines hybriden Turbulenzmodells


    Contributors:
    Kawai, Soshi (author) / Fujii, Kozo (author)

    Published in:

    AIAA Journal ; 43 , 6 ; 1265-1275


    Publication date :

    2005


    Size :

    11 Seiten, 21 Bilder, 1 Tabelle, 40 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






    Computational Study of a Supersonic Base Flow Using LES/RANS Hybrid Methodology

    Kawai, S. / Fujii, K. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2004



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