Numerical simulations are performed to study the effect of freestream turbulence on small-amplitude limit-cycle oscillations of an airfoil at transitional Reynolds numbers. A one-degree-of-freedom aeroelastic model was coupled with the National Research Council Canada in-house computational-fluid-dynamics code INSflow to perform unsteady Reynolds-averaged Navier–Stokes simulations for flows around a rigid NACA 0012 airfoil in free-to-rotate conditions. Without coupling a transition model, unsteady Reynolds-averaged Navier–Stokes computations based on the commonly used shear-stress-transport turbulence model could not capture the limit-cycle oscillations. This was expected because it had been previously shown that the limit-cycle oscillations were fed by negative aerodynamic damping due to laminar boundary-layer separation. A correlation-based transition model was then implemented in the code and applied to investigate the turbulence effects. The computed results confirmed qualitatively the experimental observations of the turbulence effects on the limit-cycle oscillations by varying the values of the turbulence intensity and length scale. It was observed that the limit-cycle oscillations were more sensitive to the turbulence intensity than to the latter. In general, the freestream turbulence suppressed the limit-cycle oscillations. The pitch amplitude became smaller when the freestream turbulence intensity was increased, which was qualitatively in good agreement with experimental results. The limit-cycle oscillations could not be sustained when the input freestream turbulence level reached around 1.25%. An examination of the unsteady flowfield revealed that the freestream turbulence affected the location of the separation points and suppressed the laminar–turbulent transition process.


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    Titel :

    Effect of Freestream Turbulence on Airfoil Limit-Cycle Oscillations at Transitional Reynolds Numbers


    Beteiligte:
    Yuan, Weixing (Autor:in) / Poirel, Dominique (Autor:in) / Wang, Baoyuan (Autor:in) / Benaissa, Azemi (Autor:in)

    Erschienen in:

    Journal of Aircraft ; 52 , 4 ; 1214-1225


    Erscheinungsdatum :

    2014-09-10


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Simulations of Airfoil Limit-cycle Oscillations at Transitional Reynolds Numbers

    Yuan, W. / Poirel, D. / Wang, B. et al. | British Library Conference Proceedings | 2012


    Simulations of Airfoil Limit-cycle Oscillations at Transitional Reynolds Numbers

    Yuan, Weixing / Poirel, Dominique / Wang, Baoyuan et al. | AIAA | 2012