A coupled simulation approach for fluid-structure-acoustic interactions is presented, which considers both the flow induced sound and the sound due to structural vibrations. The proposed computation scheme is based on a partitioned approach that uses different simulation codes for the flow simulation and the structural and acoustic computations. The flow simulation is done by an in-house finite-volume code solving the incompressible Navier-Stokes equations in space and time. For the structural mechanics computations, an in-house finite element multiphysics code is applied, which is also able to solve the acoustic wave equation describing the wave propagation to the far field. An implicit coupling scheme with sub-iterations in each time step is employed for fluid structure interaction. The computation of the aeroacoustic sound is based on Lighthill's theory. The structural-acoustic coupling is realized by applying appropriate boundary conditions to the acoustic wave equation. The above-described methodology is applied to a simplified model of a car underbody. The acoustic field due to the interaction of a thin, flexible plate representing coverings of the car underbody and a turbulent flow is investigated. The flexible plate is part of an otherwise rigid wall that is overflown by air. To model obstacles typically found at real car underbodies, a square cylinder is placed upstream of the flexible plate. The Reynolds number of the flow based on the free stream velocity and the obstacle height is 26,000.


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    Title :

    Fluid-structure-acoustic interaction of a thin, flexible plate in the wake of a wall-mounted square cylinder


    Additional title:

    Akustische Fluid-Struktur-Wechselwirkung einer dünnen, flexiblen Platte im Nachlauf hinter einem wandmontierten, viereckigen Zylinder


    Contributors:
    Uffinger, T. (author) / Schäfer, F. (author) / Becker, S. (author) / Grabinger, J. (author) / Kaltenbacher, M. (author)


    Publication date :

    2009


    Size :

    12 Seiten, 13 Bilder, 17 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English







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