The current effort characterizes the details of flow interactions and wake interference effects between two cylinders in a tandem configuration. This setup is representative of several component-level flow interactions that occur when air flows over the main landing gear of aircraft. Such interactions are likely to have a significant impact on the noise radiation associated with the undercarriage. This paper focuses on two-dimensional, time-accurate flow simulations of two distinct tandem cylinder flowregimes, associated with short and intermediate separation distances between the two cylinders. Unsteady Reynolds averaged Navier-Stokes simulations using a two-equation turbulence model run at a Reynolds number of 1:66 105 and a Mach number of 0.166 are presented. Emphasis is placed on understanding both the time-averaged and unsteady flow features between the two cylinders and in the wake of the rear cylinder. Predicted mean-flow quantities and vortex shedding frequencies show reasonable agreement with measured data for both cylinder spacings. Computations for the short separation distance exhibit a nonphysical decay of flow unsteadiness with time; however, the predicted sensitivity of the mean lift coefficient to small variations in the upstream flow angularity explains the asymmetric flowfield observed in the present and previous measurements.


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    Title :

    Unsteady flowfield around tandem cylinders as prototype component interaction in airframe noise


    Additional title:

    Instabiles Strömungsfeld um Tandem-Zylinder als Protoptyp der Komponentenwechselwirkung beim Fluglärm



    Published in:

    AIAA Journal (online) ; 45 , 8 ; 1930-1941


    Publication date :

    2007


    Size :

    12 Seiten, 18 Bilder, 29 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English