The unsteady flows past a NACA0015 airfoil near stall at a high Reynolds number are investigated numerically using the delayed detached-eddy simulation with adaptive coefficient model. The unsteady feature is primarily represented by a low-frequency oscillation, attributed to the quasi-period movement of the separation point. Correlation analysis between the instantaneous lift coefficient and separation point location indicates that the two signals present nearly in-phase behavior. Other unsteady characteristics such as the trailing-edge vortex shedding and instability of the upper surface shear layer are also analyzed. Since the Strouhal number corresponding to the movement of the separation point based on the projected airfoil height S t h varies significantly with the angle of attack, the normalized Strouhal number based on the length of the recirculation region S t L is observed to have a value of approximately 0.036 and be insensitive to the angle of attack.


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    Title :

    Low-Frequency Oscillation over NACA0015 Airfoil Near Stall at High Reynolds Number


    Contributors:
    Liu, Jian (author) / Xiao, Zhixiang (author)

    Published in:

    AIAA Journal ; 58 , 1 ; 53-60


    Publication date :

    2019-09-05


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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