A comparison of experimental wind tunnel and CFD simulation results for wall pressure fluctuations on the side-glass (drivers window) of a full scale production automobile for different geometry configurations at 140 km/hr free stream air speed is presented. The numerical results have been obtained using the commercial software PowerFLOW 3.5c. The simulation kernel of this software is based on the numerical scheme known as the Lattice Boltzmann Method (LBM), combined with a two-equation RNG turbulence model. This scheme accurately captures time-dependent aerodynamic behavior of turbulent flows over complex detailed geometries, including the pressure fluctuations causing wind noise. Spectral analysis is performed on the simulation data for several microphones on the side-glass and the results are compared to the experimental data. This comparison shows good agreement between the simulation and experiment for all microphone locations, and demonstrates the capability of this numerical scheme in predicting turbulent fluctuations due to complex flow phenomena. A visualization technique is presented which allows the entire surface region of interest to be colored with sound pressure levels (SPL) in preferred frequency bands. Using this technique, area weighted SPL in 1/3 octave bands for the entire side-glass region on the driver side for different geometry configurations are calculated and compared to each other. In addition the detailed 3D transient flow structures are visualized in several different ways. This type of analysis and visualization helps to identify the noise producing flow structures as a function of frequency, and to compare across different designs. Also the frequency range for which each separated flow structure dominates can be determined.
Numerical simulation of wind noise on the sideglass of a production automobile
Numerische Simulation des Windgeräusches an der Seitenscheibe eines Serienfahrzeuges
2006
21 Seiten, 25 Bilder, 31 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Aeroakustik , mathematisches Modell , Fahrgeschwindigkeit , Turbulenzmodell , Schallpegel , Schalldruck , 3D-Strömung , instationäre Strömung , numerische Strömungssimulation , Navier-Stokes-Gleichung , kompressible Strömung , reibungsbehaftete Strömung , Reynolds-Zahl , Randbedingung , Spektralanalyse , experimentelle Untersuchung , akustische Messung , Wandschubspannung
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