Application of a Newly Implemented Numerical Tool for Aeroacoustic Vehicle Development

Abstract:

Nowadays， the implementation and application of numerical methodologies for aeroacoustic analysis become increasingly essential for car manufacturers in order to optimize the effectiveness of the vehicle development process. In this paper， a hybrid numerical tool based on the combination of a delayed detached eddy simulation and a finite element model was presented. The finite element model in turn was based on Lighthill’s equation and acoustic perturbation equations. The computational fluid dynamics and the computational aeroacoustics were respectively performed by the software OpenFOAM and Actran. The aeroacoustic behavior of the SUV Lamborghini Urus using different roof spoiler designs was investigated. The numerical simulations were verified against the experimental measurements conducted in the aeroacoustics full scale wind tunnel of the University of Stuttgart operated by FKFS. Furthermore， the main noise generation mechanisms at the spoiler were discussed and the change of pressure fluctuation level on the car surface with respect to a geometry variation was investigated.

Key words:vehicle aeroacoustics;computational aeroacoustics;wind noise;vehicle comfort