Sound generated by an airfoil in the wake of a rod is predicted numerically by two different hybrid CFD/CAA approaches (Ma = 0.2). The configuration is a symmetric airfoil one chord downstream of a rod, whose wake contains both periodic and broadband vortical fluctuations. In particular, a significant broadening of the main Strouhal peak has been observed at subcritical vortex shedding conditions. This study addresses the overall ability of both CFD/CAA hybrid approaches to model broadband noise sources. The first approach computes the aerodynamic noise by solving the linearized perturbed compressible equations (LPCE) for the noise propagation, with the acoustic sources and hydrodynamic flow variables computed from the incompressible Large Eddy Simulation (iLES) using a computional grid of approximately 3 million grid cells and high-order compact finite difference schemes. The second approach uses the unsteady aerodynamic field of a compressible Detached Eddy Simulation (DES) and a acoustic analogy formulation for the farfield noise calculations. The non-zonal DES approach solves either the unsteady Reynolds-averaged or spatially filtered Navier-Stokes equations by using a novel cubic explicit algebraic stress turbulence model based on a two-equation k-e model by Lien and Lechziner. An implicit formulation is used with second order accuracy and a grid of approximately 2.3 million cells. The results of these hybrid approaches are compared and subsequently validated with the measurements of Jacob in the nearfield (HWA) and in the farfield (noise).


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Three-dimensional predictions of the rod wake-airfoil interaction noise by hybrid methods


    Beteiligte:
    Greschner, Björn (Autor:in) / Peth, Sven (Autor:in) / Moon, Young J. (Autor:in) / Seo, Jung H. (Autor:in) / Jacob, Marc C. (Autor:in) / Thiele, Frank (Autor:in)


    Erscheinungsdatum :

    2007


    Format / Umfang :

    8 Seiten, 7 Bilder, 1 Tabelle, 15 Quellen


    Anmerkungen:

    (nicht paginiert)



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




    Active aerodynamic control of wake-airfoil interaction noise - Experiment

    SIMONICH, J. / LAVRICH, P. / SOFRIN, T. et al. | AIAA | 1993


    Active Aerodynamic Control of Wake-Airfoil Interaction Noise - Theory

    Kerschen, E. J. / Deutsche Gesellschaft fur Luft- und Raumfahrt e.V. / AIAA | British Library Conference Proceedings | 1992



    Active Aerodynamic Control of Wake-Airfoil Interaction Noise - Experiment

    Simonich, J. C. / Lavrich, P. L. / Sofrin, T. G. et al. | British Library Conference Proceedings | 1992