Numerical Investigation of Tonal Noise at Automotive Side Mirrors due to Aeroacoustic Feedback

Schell, Alexander; Eiselt, Mark

doi:10.4271/2020-01-1514

Cited by 3 publications

(1 citation statement)

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“…For the far-field noise predictions, methods such as Ffowcs Williams-Hawkings (FW-H), Acoustic Perturbation Equations (APE), Lighthill's analogies and Direct Noise Computation (DNC) are commonly used for predicting and mitigating the induced noise from side-view mirrors. [29][30][31][32][33] Lokhande et al 34 used the LES approach with the FW-H analogy and DNC method for evaluating acoustic and compared the numerical prediction against the experimental by Siegert et al 13 The hydrodynamic pressure fluctuations were resolved accurately up to 700 Hz with a maximum deviation of 5-10 dB, and also SPL reported was in reasonable agreement with experiments at high frequencies against the experimental results of Siegert et al 13 Rung et al 14 observed a similar deviation in the SPL level predicted by DES with the FW-H analogy. The authors point out that the deviations in the studies mentioned above were attributed to the low-resolution of the grid in the wake and larger time steps used.…”

Section: A the Generic Side View Mirrormentioning

confidence: 99%

Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

2021

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Noise radiated from flow past different configurations of the Half-Round Mirror (HRM) mounted on a plate has been investigated using computational aeroacoustics (CAA).The Stress-Blended Eddy Simulation (SBES), together with the Ffowcs Williams-Hawkings (FW-H) acoustic analogy, was employed to predict near field flow and far-field noise, respectively. The numerical methodology was verified and validated for the standard HRM case against several previously published numerical and experimental data sets, which provides good agreement. Further, (i) the choice of different type of grids for CAA and (ii) the applicability of methods such as the Kirchhoff integral and the FW-H using near field inputs computed from the SBES were assessed. As a next step, the effect of induced noise from the HRM for different a) Aspect Ratios (AR) ranging from 1 to 2.5 and b) inclination of the mirror towards the plate (θ) ranging from 0° to 32° were investigated. For all the investigated cases, the distribution of the radiated noise exhibits a dipole-like structure closer to the plate and a monopole-like structure away from the plate. By inclining the mirror closer to the mounting plate, the emitted noise is reduced both in the vertical and lateral directions of the wake, whereas an increase in the AR of the mirror increases the induced noise considerably. The findings from the current study can provide a deeper understanding for effectively mitigating the induced aerodynamic noise from side-view mirrors.

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