Investigation of interior noise from generic side-view mirror using incompressible and compressible DES and LES

Paper #:
  • 2018-01-0735

Published:
  • 2018-04-03
Abstract:
Exterior turbulent flows are the important sources of the interior noise in automobile cabs. The turbulent flows impinge on the windows of the cabs to excite the structural vibration that emits the interior noise. Meanwhile, the exterior noise generated from the turbulent flows is transferred through the windows. Side-view mirrors installed upstream of the windows are one of the predominant body parts inducing the turbulent flows. In this paper, we investigate the interior noise caused by a generic side-view mirror. The interior noise propagates in a cuboid cavity with a rectangular glass window. The flow and the aerodynamic generated noise are computed using five advanced CFD methods, compressible large eddy simulation (LES), compressible detached eddy simulation (DES), incompressible LES, incompressible DES, and incompressible DES coupled with acoustic perturbation equations (APE). The last method is used to simulate the hydrodynamic and acoustic pressure separately. The pressure fluctuations of the flow and noise are imposed on the window in the computation of the interior noise, but the reversal effect of the window vibration feeding back on the flow is neglected in the flow simulation. The localized flow characteristics are discussed. The energetic surface pressure appears in the regions where the shear layer from the mirror side edge impinges on the window. The exterior surface pressure is divided into hydrodynamic and acoustic components. The contributions of these components to the window displacements and interior noise are quantified. The acoustic component is found to be more efficient in the interior noise generation and to play the dominant role at high frequencies. The coherent structures in the side shear layer and recirculation bubble are responsible for the energy bulges in the acoustic component of the interior noise.
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