The ability of one- and two-equation turbulence models to predict unsteady separated flows over airfoils is evaluated. An implicit, factorized, upwind-biased numerical scheme is used for the integration of the compressible, Reynolds-averaged Navier-Stokes equations. The turbulent eddy viscosity is obtained from the computed mean flowfield by integration of the turbulent field equations. One- and two-equation turbulence models are first tested for a separated airfoil flow at fixed angle of incidence. The same models are then applied to compute the unsteady flowfields about airfoils undergoing oscillatory motion at low subsonic Mach numbers. Experimental cases where the flow has been tripped at the leading-edge and where natural transition was allowed to occur naturally are considered. The more recently developed turbulence models capture the physics of unsteady separated flow significantly better than the standard kappa-epsilon and kappa-omega models. However, certain differences in the hysteresis effects are observed. For an untripped high-Reynolds-number flow, it was found necessary to take into account the leading-edge transitional flow region to capture the correct physical mechanism that leads to dynamic stall.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Computation of oscillating airfoil flows with one- and two-equation turbulence models


    Contributors:

    Published in:

    AIAA Journal ; 32 , 12


    Publication date :

    1994-12-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English







    Computations of High-Lift Airfoil Flows Using Two-Equation Turbulence Models

    Chang Sung Kim / Kim, C. / Oh Hyun Rho et al. | British Library Conference Proceedings | 1999


    One-equation turbulence model for transonic airfoil flows

    Mitcheltree, R. A. / Hassan, H. A. / Salas, M. D. | NTRS | 1990