Aerdynamic Noise Simulation of a Car Side Mirror at Hight Speed
Main Article Content
Abstract
Airflow around the car side mirrors is one of the "sensitivity" zones in which the airflow is separated and detached from the flat side of the mirror. The turbulence created by this flow detachment can then affect the airflow to the main body of the car which lies behind the mirror. The turbulent structures of airflow exert directly on the lateral panels that causes the reduction of the car performance due to the increased drag, the source of noise and vibration, and so on. Consequently, the analysis of structure of airflow allows a better understanding of the aerodynamic phenomena that is the origin of noise source and provides design information to improve and optimize the side mirrors. In this paper, the focus lies on the aerodynamic noise simulation by analyzing the turbulent flow structure and predict the external acoustic field using LES turbulent modeling approaches. The numerical results are compared with experiments through which to provide an overview on the “aerodynamic noise” around car side mirror.
Keywords
Car side mirror, RANS, LES, Static pressure, Sound pressure level
Article Details
References
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[11] J. H. Kim, Y. O. Han and B. D. Lim, 2009 Experimental study of statistical and spectral characteristics of wake flow around the rear-view side mirror of a passenger car, Proceedings of 5th European and African Conference on Wind Engineering, EACWE 5, Florence, Italy.
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[14] T. Uffinger, S. Becker, D. Antonio, Investigations of the flow field around different wall-mounted square cylinder stump geometries, 14th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal. 2008,
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[18] X. Chen, S. Wang, Y. Wu, Y. Li, Wang, H. Wang, Experimental and numerical investigations of the aerodynamic noise reduction of automotive side view mirrors, Journal of Hydrodynamics, Vol. 30(4), pp. 642-650. 2018, https://doi.org/10.1007/s42241-018-0070-1
[19] ANSYS CFX-19.1, 2018, ANSYS Inc.
[2] J. E. Ffowcs Williams and D. L. Hawkins, Sound generation by turbulence and surfaces in arbitrary motion sound, Philos. Trans. Roy. Soc., Vol. 264, No. 1151, pp. 321-342. 1969, https://doi.org/10.1098/rsta.1969.0031
[3] H. Fujita, W. Sha, H. Furutani, H. Suzuki, Experimental investigations and prediction of aerodynamic sound generated from square cylinders, 4th AIAA/CEAS Aeroacoustics Conference, Toulouse, France, pp. 942-947. 1998, https://doi.org/10.2514/6.1998-2369
[4] R. Hoeld, A. Brenneis, A. Eberle, V. Schwarz, R. Siegert, Numerical simulation of aeroacoustic sound generated by generic bodies placed on a plater: Part I - prediction of aeroacoustic sources, In 5th AIAA/CEAS Aeroacoustic Conference. Bellevue, Washington, USA. 1999, https://doi.org/10.2514/6.1999-1896
[5] R. Siegert, V. Schwarz, J. Reichenberger, Numerical simulation of aeroacoustic sound generated by generic bodies placed on a plater: Part II - prediction of radiated sound, In 5th AIAA/CEAS Aeroacoustic Conference. Bellevue, Washington, USA. 1999, https://doi.org/10.2514/6.1999-1895
[6] J. Ask, L. Davidson, The Sub-critical flow past a generic side mirror and its impact on sound generation and propagation, collection of technical papers - 12th AIAA/CEAS Aeroacoustics Conference, Cambridge, Massachusetts, USA. 2006, https://doi.org/10.2514/6.2006-2558
[7] T. Grahs, C. Othmer, Evaluation of aerodynamic noise generation: parameter study of a generic side mirror evaluating the aeroacoustic source strength, Proceedings of the European Conference on Computational Fluid Dynamics (ECCOMAS CFD 2006), Delft University of Technology, Delft, Netherlands. 2006,
[8] Y. Wang, Z. Gu, W. Li, X. Lin, Evaluation of aerodynamic noise generation by a generic side mirror, world academy of science, engineering and technology, International Journal of Aerospace and Mechanical Engineering, Vol. 4, No. 1, pp. 120-127. 2010,
[9] B. Lokhande, S. Sovani and J. Xu, Computational Aeroacoustic Analysis of a Generic Side View Mirror, SAE Technical Papers. Paper No. 2003-01-1698. 2003, https://doi.org/10.4271/2003-01-1698
[10] I. Afgan, C. Moulinec and D. Laurence, Numerical simulation of generic side mirror of a car using large eddy simulation with polyhedral meshes, International Journal for Numerical Methods in Fluids, Vol. 56(8), pp. 1107-1113. 2008, https://doi.org/10.1002/fld.1719
[11] J. H. Kim, Y. O. Han and B. D. Lim, 2009 Experimental study of statistical and spectral characteristics of wake flow around the rear-view side mirror of a passenger car, Proceedings of 5th European and African Conference on Wind Engineering, EACWE 5, Florence, Italy.
[12] R. H. Barnard, 1988, Road Vehicle Aerodynamic Design: An Introduction, Longman: New York, USA.
[13] T. Rung, D. Eshricht, J. Yan and F. Thiele, 2002, Sound Radiation of the Vortex Flow Past a Generic Side Mirror, 8th AIAA/CEAS Aeroacoustics Conference & Exhibit, Breckenridge, Colorado, USA. https://doi.org/10.2514/6.2002-2549
[14] T. Uffinger, S. Becker, D. Antonio, Investigations of the flow field around different wall-mounted square cylinder stump geometries, 14th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal. 2008,
[15] P. Spalart, W. H. Jou, M. Strelets, S. Allmaras, 1997, Comment on the feasibility of LES for wing, and on a hybrid RANS/LES approach, In Advances in DNS/LES First AFOSR International Conference on DNS/LES, Greyden Press.
[16] F. Menter, M. Kuntz and R. Bender, A scale-adaptive simulation model for turbulent flow prediction, 41st Aerospace Sciences Meeting and Exhibit, Reno, Nevada, USA. 2003, https://doi.org/10.2514/6.2003-767
[17] M. Escobar, I. Ali, C. Hahn, M. Kaltenbacher, S. Becker, Numerical and experimental investigation on flow induced noise from a square cylinder, Collection of Technical Papers - 10th AIAA/CEAS Aeroacoustics Conference. 2004, https://doi.org/10.2514/6.2004-3004
[18] X. Chen, S. Wang, Y. Wu, Y. Li, Wang, H. Wang, Experimental and numerical investigations of the aerodynamic noise reduction of automotive side view mirrors, Journal of Hydrodynamics, Vol. 30(4), pp. 642-650. 2018, https://doi.org/10.1007/s42241-018-0070-1
[19] ANSYS CFX-19.1, 2018, ANSYS Inc.