Calculation process with Lattice Boltzmann and Finite Element methods to choose the best exterior design for wind noise
Authors : Guillaume BAUDET, Cécile DUTRION, Rémi LORENZI, Félix GENDRE, Shanshan GENG Renault Automotive wind noise is a complex phenomenon. Noise in the cabin depends of: - The exterior loading due to the flow around the vehicle - The transfer loss of seals and panels - The acoustic transfer function of the cabin Each part of this cascading must optimized to have a good final performance. So the exterior design is a key parameter because it influence the loading (pressure field) on the vehicle panels and seals. For some years, we know that the exterior loading is split in two parts: - Hydrodynamic (or turbulent) loading with high wave number pressure field - Acoustic loading with low wave number pressure field In this paper, we present a calculation process which enables to predict the acoustic source created by the lateral window at high speed which has a major contribution to the interior noise.