Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
Volume 236, Issue 6, Pages 1071-1091Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/09544070211034319
Keywords
Corrected force analysis technique; hydrodynamic pressure; acoustic pressure; acoustic perturbation equations; dynamic mode decomposition
Funding
- Shanghai Key Laboratory of Aerodynamics and Thermal Environment Simulation for Ground Vehicles [18DZ2273300]
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The study demonstrates that the unsteady flow in the front side window region of the vehicle can generate hydrodynamic and acoustic pressure on the front side window, thereby affecting the interior sound field. The hydrodynamic pressure predominantly concentrates in the area interacting with the side mirror wake, while the acoustic pressure uniformly distributes on the front side window, with energy dispersing in the frequency region.
The unsteady flow in the front side window region of the vehicle can generate hydrodynamic and acoustic pressure on the front side window, which can influence the interior sound field. The hydrodynamic pressure on the front side window was achieved by the incompressible wall-modeled large-scale eddy simulation (WMLES) or improved delayed detached eddy simulation (IDDES), and the hybrid computational aeroacoustics (CAA) method based on acoustic perturbation equations (APE) was employed to achieve the acoustic pressure on the front side window. The numerical results of both hydrodynamic and acoustic pressure ware validated by the wind tunnel experiment, especially the corrected force analysis technique (CFAT) is employed to validate the acoustic pressure. The comparison of hydrodynamic and acoustic pressure on the front side window was performed by the Dynamic Mode Decomposition (DMD). Results show that the hydrodynamic pressure regionally distributes on the front side window and most energy concentrates on area interacted with the side mirror wake, while the acoustic pressure distributes uniformly on the front side window acting as a diffusion field and the energy disperses in frequency region.
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