This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Prediction of Aeroacoustical Interior Noise of a Car, Part-1 Prediction of Pressure Fluctuations on External Surfaces of a Car
Technical Paper
2016-01-1617
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A wall-resolving Large Eddy Simulation (LES) has been performed by using up to 40 billion grids with a minimum grid resolution of 0.1 mm for predicting the exterior hydrodynamic pressure fluctuations in the turbulent boundary layers of a test car with simplified geometry. At several sampling points on the car surface, which included a point on the side window, the door panel, and the front fender panel, the computed hydrodynamic pressure fluctuations were compared with those measured by microphones installed on the surface of the car in a wind tunnel, and effects of the grid resolution on the accuracy of the predicted frequency spectra were discussed. The power spectra of the pressure fluctuations computed with 5 billion grid LES agreed reasonably well with those measured in the wind tunnel up to around 2 kHz although they had some discrepancy with the measured ones in the low and middle frequencies. The Dynamic Smagorinsky Model (DSM) was adopted for the subgrid-scale turbulence model of LES while the resulting spatially-filtered Navier-Stokes equations of the incompressible fluid flow were solved by a Finite Element Method. In the second paper of this series of studies, the hydrodynamic pressure fluctuations computed on the car surfaces will be used as the unsteady loading for computing the panel vibration of the test car by using Finite Element Method, and finally the interior acoustical fields will be predicted by solving the Helmholtz equation for sound propagation. The contribution from the external acoustical field to the interior noise, which was not simulated by the present incompressible LES-based approach, was estimated based on the acoustic analogy, and was confirmed to be negligibly small compared with those from the hydrodynamic loading in the present case.
Recommended Content
Authors
- Yoshinobu Yamade - Mizuho Information and Research Institute
- Chisachi Kato - University of Tokyo
- Shinobu Yoshimura - University of Tokyo
- Akiyoshi Iida - Toyohashi University of Technology
- Keiichiro Iida - Suzuki Motor Corp
- Kunizo Onda - Allied Engineering Corporation
- Yoshimitsu Hashizume - Suzuki Motor Corp.
- Yang Gou - University of Tokyo
Topic
Citation
Yamade, Y., Kato, C., Yoshimura, S., Iida, A. et al., "Prediction of Aeroacoustical Interior Noise of a Car, Part-1 Prediction of Pressure Fluctuations on External Surfaces of a Car," SAE Technical Paper 2016-01-1617, 2016, https://doi.org/10.4271/2016-01-1617.Also In
References
- Shorter , P. J. and Langley , R. S. Vibro-acoustic analysis of complex system Journal of Sound and Vibration 288 669 699 2005
- Kosaka , F. , Okutsu , Y. , Hamamoto , N. , and Shiozaki , H. An SEA Modeling for Wind Noise Using Wavenumber-Frequency Spectrum Transactions of the Japan society of mechanical engineers 79 806 3691 3709 2013
- Chen , S. M. , Wang , D. F. and Zan , J. M. Interior Noise Prediction of the Automobile Based on Hybrid FE-SEA Method Mathematical Problems in Engineering 1 20 1 20 2011
- Lepley , D. , Graf , A. , Powell , R. , and Senthooran , S. A Computational Approach to Evaluate the Vehicle Interior Noise from Greenhouse Wind Noise Sources SAE Technical Paper 2010-01-0285 2010 10.4271/2010-01-0285
- Graf , A. , Lepley , D. , and Senthooran , S. A Computational Approach to Evaluate the Vehicle Interior Noise from Greenhouse Wind Noise Sources - Part II SAE Technical Paper 2011-01-1620 2011 10.4271/2011-01-1620
- Lepley , D. , Senthooran , S. , Hendriana , D. , and Frazer , T. Numerical Simulations and Measurements of Mirror-Induced Wind Noise SAE Int. J. Passeng. Cars - Mech. Syst. 2 1 1550 1562 2009 10.4271/2009-01-2236
- Schell , A. and Cotoni , V. Prediction of Interior Noise in a Sedan Due to Exterior Flow SAE Int. J. Passeng. Cars - Mech. Syst. 8 3 1090 1096 2015 10.4271/2015-01-2331
- Serre , E. , Minguez , M. , Pasquetti , R. , Guilmineau , E. et al. On simulating the turbulent flow around the Ahmed body: A French-German collaborative evaluation of LES and DES Computers & Fluids 78 10 23 2013
- Guilmineau , E. Computational study of flow around a simplified car body Journal of Wind Engineering and Industrial Aerodynamics 96 6-7 1207 1217 2008
- Krajnović , S. and Davidson , L. Flow Around a Simplified Car, Part 1: Large Eddy Simulation Journal of Fluids Engineering 127 5 907 918 2005
- Kato , C. , Kaiho , M. and Manabe , A. An overset Finite-Element Large-Eddy-Simulation method with application to Turbomachinery and Aeroacoustics Trans. ASME, Journal of Applied Mechanics 70 32 43 2003
- Kato , C. , Yamade , Y. , Wang , H. , Guo , Y. et al. Numerical prediction of sound generated from flows with a low Mach number Computers & Fluids 36 1 53 68 2005
- Germano , M. , Piomelli , U. , Moin , P. , and Cabot , W. H. A dynamic subgrid-scale eddy-viscosity model Phys. Fluids A 3 7 1760 1765 1991
- Lilly , D. K. A proposed modification of the Germano subgridscale closure model Phys. Fluids A 4 3 633 635 1992
- Guo , Y. , Kato , C. , Yamade , Y. , Ohta , Y. et al. Computation of Noise from the Internal Flow in a Centrifugal Blower The 13th Asian International Conference on Fluid Machinery, AICFM13-137 Japan 2015
- Yamade , Y. , Kato , C. , Nagahara , T. , and Matsui , J. Large Eddy Sumulation of Unsteady Vortices in a Pump Sump AJK2015, AJK2015-FED140753 2015 Seuol
- Schneider , R. , Juergens , D. , and Kohn , A. Software Parallelization in Automotive Multi-Core Systems SAE Technical Paper 2015-01-0189 2015 10.4271/2015-01-0189
- Nishikawa , T. , Yamade , Y. , Sakuma , M. , and Kato , C Fully resolved large eddy simulation as an alternative to towing tank resistance tests - 32 billion cells computation on K computer 16th Numerical Towing Tank Symp. (NuTTS) Mülheim
- Yoshimura , S. , Tokunaga , K. , Sugimoto , S. , Okuda , H. et al. Efficient Large Scale Finite Element Analyses with Parallel Model Refinement Transactions of the Japan Society for Computational Engineering and Science 2013
- ADVENTURECluster Allied Engineering Corporation http://www.alde.co.jp/
- ADVENTURE Project http://adventure.sys.t.u-tokyo.ac.jp/
- Suzuki , M. , Ohyama , T. , Akiba , H. , Noguchi , H. , and Yoshimura , S. Development of fast and robust parallel CGCG solver for large scale finite element analyses Trans. Jpn. Soc. Mech. Eng. 68 671 1010 1017 2002
- Lighthill , M. J. On Sound Generated Aerodynamically. I. General Theory Proc. R. Soc. London A 211 1107 564 587 1952
- Tanio , M. , and Sugihara , M. Gbi-CGSTAB(s, L): IDR(s) with Higher-Order Stabilization Polynomials Journal of Computational and Applied Mathematics 235 3 765 784 2010
- Yoshimura , S. , Yamada , T. , and Yonemura , N. REVOCAP_ Coupler: General Purpose CAE Platform for Large Scale Coupled Analyses Jpn. Soc. Mech. Eng 11 902 903 2008
- Curle , N. The Influence of Solid Boundaries upon Aerodynamic Sound Royal Society A 231 1187 505 510 1955
- Iida , K. , Onda , K. , Iida , A. , Kato , C. et al. Prediction of Aeroacoustical Interior Noise of a Car, Part-2 Structural and Acoustical Analyses SAE Technical Paper 2016-01-1616 2016