The field of aeroacoustics is becoming more prevalent within the automotive industry as manufacturers strive towards increased vehicle refinement and passenger comfort. Aston Martin Lagonda (AML) have invested in an open source CFD methodology, and developed an aeroacoustic utility capable of accurately predicting the Sound Pressure Level (SPL) over the surface of a vehicle. The module sits within the existing structure of a general CFD simulation, meaning the geometry and mesh is common with that of other typical CFD studies. The aeroacoustic module utilises Curie's solution to the Lighthill analogy, where the acoustic performance is determined by fluctuations in the fluid flow. Noise levels at mid and far field receivers can be determined, as well as the sound pressure levels on the vehicle surfaces, which is more pertinent to in-cabin noise levels. The timeaccurate flow solution uses a Detached Eddy Simulation (DES) numerical scheme to capture unsteady flow features. A well-documented experimental study of flow over a simplified wing mirror was used for validation of the model - Villiers (1) and Ask and Davidson (2) - as well as comparison with other commercial codes. A subsequent Acoustic Wind Tunnel (AWT) test showed good correlation between geometry changes and CFD predictions.


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    Title :

    Open source automotive aeroacoustic simulation at Aston Martin Lagonda


    Contributors:
    McAllister, A. (author) / Coe, D. (author)


    Publication date :

    2014


    Size :

    11 Seiten, Bilder, Tabellen, 13 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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