# Vol. 39, No. 3 (2016) (1)

## Numerical Calculation and Analysis of Automobile Aerodynamic Noise Based on Large Eddy Simulation

Author(s):
J. H. Tang†‡*, Y. Y. Zuo‡, S. Y. Bei†, & K. Y. Wang†‡

Affiliation(s):

†School of Automotive and Traffic Engineering, Jiangsu University of Technology, Changzhou 213001, China,
‡School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China
Cite this paper
J. H. Tang, Y. Y. Zuo, S. Y. Bei, & K. Y. Wang, “Numerical Calculation and Analysis of Automobile Aerodynamic Noise Based on Large Eddy Simulation”, Journal of Mechanical Engineering Research and Developments, vol. 39, no. 3, pp. 607-616, 2016. DOI: 10.7508/jmerd.2016.03.001

ABSTRACT: The entire vehicle model of a certain type of car is established, the numerical calculation and analysis on the internal flow field of vehicle model and the aerodynamic noise at the receiving point near the left ear of the driver are carried out based on the large eddy simulation. The distributions of pressure field and velocity in the car are obtained with the different ways of opening the windows and 4 typical operating conditions with different opening degrees. Meanwhile, the frequency domain diagrams of sound pressure level at the reception points near the driver’s left ear are acquired. It is derived from the analysis that there is a close relationship between the wind vibration noise in the car and the opening size and opening mode of the car’s windows. The wind vibration noise is the smallest when the opening degree of the front window is 1/3. When the opening degrees are same, the wind vibration noise of the rear window is larger than that of the front window. Therefore, the reasonable opening mode and the opening degree of the car’s window can effectively control the wind vibration noise. According to the mechanism of wind vibration, the noise reduction method though retrofitting a column is adopted to reduce the noise of the rear window. And the maximum reduction of pressure fluctuation of wind vibration is about 19dB, which improves the passenger ride comfort.

Keywords : Automotive engineering; Wind vibration noise; Numerical calculation; Large eddy simulation.

References
[1] G. Q. Wu, Y. Sheng, and Y. Fang, “Coupled acoustic-structural finite element analysis of vehicle interior noise based on acoustic sensitivity”, Journal of Mechanical Engineering, vol. 45, no. 3, pp. 222-228, 2009.
[2] J. Q. Gao, X. X. Jin, G. D. Lu, et al, “Simulation study on car interior noise based on SEA”, Automobile Technology, no. 6, pp. 23-27, 2009.
[3] T. Lan, N. Kang, H. Zheng, and C. A. Hu, “Study on the aerodynamic noise of a fastback car with rear view mirrors in uniform motion and accelerated motion”, Journal of Aerospace power, vol. 24, no. 1, pp. 116-121, 2009.
[4] J. P. Chen, Z. P. Sun, and X. C. Que, “Numerical simulation of airflow and temperature in the car with passenger”, Automotive Engineering, vol. 21, no. 5, pp. 309-3131, 1999.
[5] W. K. Bodger and C. M. Jones, “Aerodynamic wind thrombin passenger cars”, SAE Technical Paper 640797, 1964.
[6] K. J. Karbon, S. Kumarasamy, and R. Singh, “Applications and issues in automotive computational aeroacoustics”, Canada: Proceedings of the 10th Annual Conference of the CFD Society of Canada, Taylor & Francis, 2002.
[7] Y. G. Shen, S. L. Lu, and X. Meng, “Simulation on aerodynamic noise of automobile’s side window at high speed”, Machinery Design & Manufacture, no. 7, pp. 125-127, 2012.
[8] N. Wang, Z. Q. Gu, S. C. Liu, G. P. Dong, and L. G. Liu, “Wind buffeting noise analysis and control for high-speed vehicle side-windows”, Journal of Aerospace Power, vol. 28, no. 1, pp. 112-119, 2013.
[9] J. Wang, Z. L. Liu, and Y. Chen, “Comparative analysis of economic efficiency of grain storage by solar absorption refrigeration”, AISS: Advances in Information Sciences and Service Sciences, vol. 4, no. 14, pp. 341-348, 2012. doi: 10.4156/AISS.
[10] S. D. Sovani and C. Kuo-Huey, “Aero acoustics of an automotive a-pillar raingutter: A numerical study with the ffowcs-williams hawkings method”, SAE paper, 2005-01-2492.
[11] V. Kannan, D. S. Sandeep, and S. Greeley Dave, “3D computational aero acoustics simulation of air intake-induced whistles”, Bosch Inc, 2004.
[12] W. Tian, “Numerical simulation and analysis of automobile wind noise”, Nanjing University of Science and Technology, 2006.
[13] D. Feng, X. Wang, F. Jiang, et al, “Large eddy simulation of darpa suboff for Re= 2.65× 107”, Journal of Coastal Research, vol. 73, no. sp1, pp. 687-691, 2015.
[14] W. Rodi, “DNS and LES of some engineering flows”, Fluid Dynamics Research, vol. 38, pp. 145-173, 2006.
[15] H. J. Zhu, Practical guide of flow field analysis based on FLUENT 15.0. Beijing: People’s Posts and Telecommunications Press, 2014.