Contribution
Development of an Evaluation Methodology for Low-Frequency Flow Phenomena
* Presenting author
Abstract:
Flow noise is important in the automotive industry, as it significantly influences driving comfort. This is especially true for battery electric vehicles (BEV). Since they generate barely any drive noise, flow induced sound is already crucial at lower driving speeds. Moreover, there are no engine noise masking effects. Despite their typically streamlined underbody shape, significant pressure fluctuations can be observed for certain vehicle configurations and frequencies below 30 Hz. Since the interior of the vehicle can be excited as a Helmholtz resonator, these low-frequency fluctuations result in reduced comfort for the passengers. To prevent this, CFD simulations should be used early in the vehicle development process. Therefore, a reliable assessment of low-frequency underbody flow must be ensured. In the following, a numerical evaluation method for low-frequency flow phenomena is presented. Subsequently, the results obtained from the simulation are then compared with wind tunnel measurements for validation.