Numerical analysis and passive control of a car side window buffeting noise based on Scale-Adaptive Simulation |
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| Institution: | 1. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha, Hunan 410082, China;2. School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Melbourne, Victoria 3083, Australia;3. School of Mechanical Engineering, Hunan University of Technology, Zhuzhou, Hunan 412008, China;4. School of Automobile Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China;1. General Motors South America, Indaiatuba, SP 13347-970, Brazil;2. Universidade Estadual de Campinas, Campinas, SP 13083-860, Brazil;1. Mechanical Engineering Department, Shoubra Faculty of Engineering, Benha University, Egypt;2. Mechanical and Industrial Engineering Department, Collage of Engineering, Qatar University, Doha (2713), Qatar;3. Mechanical Engineering Department, UBC-University of British Columbia, Vancouver, BC, Canada;4. Mechanical Engineering Department, the French University in Egypt, Al-Shorouk City, New Cairo, Egypt;1. Aix Marseille Univ, CNRS, Centrale Marseille, Laboratoire de Mécanique et d’Acoustique (LMA), 38 rue Frédéric Joliot-Curie, 13013 Marseille, France;2. Instituto de Tecnologías Físicas y de la Información (ITEFI), Consejo Superior de Investigaciones Científicas (CSIC), Serrano 144, 28006 Madrid, Spain;3. Ecole Centrale Marseille, Institut de Recherche sur les Phénomènes Hors Equilibres (IRPHE), UMR–CNRS 7342, Aix Marseille Université, 38 rue Frédéric Joliot-Curie, 13013 Marseille, France;1. Key Lab of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China;2. School of Engineering, Trinity College Dublin, The University of Dublin, D02PN40, Ireland;3. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China |
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| Abstract: | Flow over an open side window in a car exhibits similar characteristics as the flow over an open cavity. Computational Fluid Dynamics (CFD) simulation over a cavity was done as a benchmark. The unsteady flow simulation was carried out using Scale Adaptive Simulation (SAS) turbulence model. The benchmark results, frequency and sound pressure levels of feedback and resonance modes, all well matched with the experimental data. Then, with the right rear window, for example, the mechanism of the side window buffeting was investigated. The simulation results show that side window buffeting noise is generated by large scale vortices and in low frequency. Furthermore, buffeting noise characteristics under several patterns of side windows opening were also numerically investigated. As a result, rear window buffeting noise is more severe than that of front window when one window open, and combination pattern of side windows open can reduce buffeting noise. To decrease the interior noise and improve car ride comfort, four suppression measures through adding a side window weather deflector at the A-pillars, constructing a cavity at the B-pillars, combination of the front and rear windows and installing a row of square cylinder deflector at the B-pillars were also studied, respectively. In conclusion, certain noise reduction can be achieved through four passive control methods. |
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| Keywords: | Scale-Adaptive Simulation Cavity Side window buffeting noise Mechanism Characteristics Passive control |
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