At present, turbulence closures for curved flows only account for curvature effects in the fully turbulent region where the Reynolds number is large. The justification is that, near a wall, viscous effects dominate and curvature effects are only of secondary importance. Recent direct simulation data show that this assumption is not valid, even for simple two-dimensional fully developed turbulent curved channel flows. This paper presents an approach to develop a near-wall turbulence closure for wall-bounded curved flows. The curved channel direct simulation data is used as a guide to held develop such a closure. The proposed closure has the unique property of approaching conventional high-Reynolds-number Reynolds-stress closures far away from the wall. Hence, curvature effects in both the near-wall and the fully turbulent parts of the flow are accounted for properly. Validations of the closure are carried out with a set of low-Reynolds-number simulation data and with experimental measurements at high Reynolds number. Good agreement is obtained in both cases; in particular, the anisotropic behavior of the normal stresses and the shear stress behavior near the convex and concave walls.


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    Title :

    Near-wall turbine closure for curved flows


    Contributors:
    So, R. M. C. (author) / Lai, Y. G. (author) / Hwang, B. C. (author)

    Published in:

    Publication date :

    1991-08-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Near-wall turbine closure for curved flows

    SO, R. M. C. / LAI, Y. G. / HWANG, B. C. | AIAA | 1991





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