A wall-distance-free modification to the Spalart–Allmaras one-equation turbulence model is proposed and evaluated. The k and ϵ that render the hybrid timescale are determined using the ν ˜ transport equation together with the Bradshaw and other empirical relations. The model coefficients and other empirical functions are constructed to preserve some anisotropic characteristics of turbulence for application to nonequilibrium turbulent flows. The modified Spalart–Allmaras model is applied to calculate a few well-documented flows, yielding predictions in good agreement with the direct numerical simulation and experimental data. Comparisons demonstrate that the modified SA model offers some improvement over the original Spalart–Allmaras model and is competitive with the shear-stress transport k - ω model.


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    Title :

    Wall-Distance-Free Version of Spalart–Allmaras Turbulence Model


    Contributors:

    Published in:

    AIAA Journal ; 53 , 10 ; 3016-3027


    Publication date :

    2015-08-14


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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