EVALUATION OF AERODYNAMIC NOISE GENERATION: PARAMETER STUDY OF A GENERIC SIDE MIRROR EVALUATING THE AEROACOUSTIC SOURCE STRENGTH

Based on a simple generic side mirror geometry, well featured with detailed measurements, we examine different combinations of meshing strategies and turbulence model, nameley DES (Detached Eddy Simulation) and SAS (Scale Adaptive Simulation). The best combination of this investigation is applied to some modified mirror geometries, in order to develop and evaluate a ranking process for the noise generation of the distinct side mirror geometries. Starting from the working knowledge of the design department, we focus on three modified geometries, with reveals good and bad properties in terms of noise production. Thus, we take one geometry with all good properties, one with all bad properties and one in-between. The question is, whether we are able to reproduce this knowledge with our computational process. Since we are dealing with industrial application and due to the time consuming computations, not suitable for an rapid development process we focus more on the possibility to classifiy the noisyness of a part rather than detailed physicall modelling. This is due to the fact, that we have to deal with evaluation times of hours or days, rather than weeks or months, which a detailed LES (Large Eddy Simulation) or well resolved DES/SAS computation will last.