A myriad of different blending or switching functions have been developed to blend Reynolds-averaged Navier–Stokes (RANS) and large-eddy-simulation (LES) models properly in order to prevent issues such as modeled stress depletion. This challenge is a large focus of modern hybrid methods along with generating sufficient turbulent statistics in the Reynolds-averaged to large-eddy-simulation interface. This paper investigates these issues by implementing a variety of blending functions in the NASA OVERFLOW computational fluid dynamics solver and comparing them with the existing length-scale blending models. Scenarios considered include a zero pressure gradient flat plate, subcritical flow around a cylinder, and a supersonic reattaching shear layer. Overall, the eddy-viscosity blending methods produce results similar, if not improved, to their length-scale blending counterparts. In particular, it was found that the entropy function gave more control and stability during the transition from RANS to LES.


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    Title :

    Application of Hybrid Reynolds Averaged Navier–Stokes and Large-Eddy-Simulation Eddy Viscosity Blending Methods in OVERFLOW


    Contributors:

    Published in:

    AIAA Journal ; 60 , 5 ; 2987-3000


    Publication date :

    2022-05-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English