Abstract
Keywords :
CFD, LES, aeroacoustics, acoustic analogy.
Abstract :
For modern cars, aerodynamic noise is becoming the major source of annoyance during peri-urban trips. To take this point into consideration from the vehicle development and to improve the interior comfort, appropriate numerical methods have then to be developed. The estimation of the broadband noise generated by a low Mach number flow about M~0.1, considered in this study, is obtained by applying a two-step method combining incompressible CFD calculations (LES) with acoustic analogy. In this paper, the advanced-time algorithm is used to estimate all the terms of Ffowcs Williams and Hawking’s equation and particularly the volume contribution. The studied configuration is a real side mirror configuration mounted on an infinite plane. The corresponding 3-D unsteady aerodynamic simulation is coupled to an acoustic analogy to determine the side mirror radiated noise. Aerodynamic and acoustic results are compared to wind tunnel measurements.