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Numerical Flow Simulation for a Generic Vehicle Body on Wheels with Variable Underbody Diffuser
Technical Paper
2012-01-0172
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Being a continuous subject of research, the authors present in this paper new aspects and results concerning the relevance of diffusers in vehicle aerodynamics. In the first stage of investigation, a generic car model with wheels was considered, starting from the Ahmed body, and the effect of adding wheels to the body was studied. Latter, the influence of diffuser length and angle, within ranges relevant to hatchback passenger cars, on drag and lift was studied for the Ahmed body with wheels. The results show that the addition of wheels and wheelhouses results in increasing of drag and lift due to the vortices which originate from the wheels. Concerning the underbody diffuser, the results show that both drag and lift of the bluff bodies with wheels are reduced with increasing diffuser length for moderate values of angle, up to six degrees for the cases studied.
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Topic
Citation
Huminic, A. and Huminic, G., "Numerical Flow Simulation for a Generic Vehicle Body on Wheels with Variable Underbody Diffuser," SAE Technical Paper 2012-01-0172, 2012, https://doi.org/10.4271/2012-01-0172.Also In
References
- Katz, J. 2006 “Race Car Aerodynamics - Designing for Speed” 2nd Bentley Publisher 978-0-8376-0142-7
- Howell, J.P. 1994 “The influence of a Vehicle Underbody on Aerodynamics of a Simple Car Shapes with an Underfloor Diffuser” Vehicle Aerodynamics, R.Ae.S. Conference Loughborough, UK 36.1 36.11
- Cooper, K. R. Bertenyi, T. Dutil, G. Syms, J. Sovran, G. “The Aerodynamic Performance of Automotive Underbody Diffusers,” SAE Technical Paper 980030 1998 10.4271/980030
- Cooper, K. R. Sovran, G. Syms, J. “Selecting Automotive Diffusers to Maximise Underbody Downforce,” SAE Technical Paper 2000-01-0354 2000 10.4271/2000-01-0354
- Desai, S. Lo, C.-M. George, A. R. “A Computational Study of Idealized Bluff Bodies, Wheels, and Vortex Structures in Ground Effect,” SAE Technical Paper 2008-01-0327 2008 10.4271/2008-01-0327
- Breslouer, J. O. George, A. R. “Exploratory Experimental Studies of Forces and Flow Structure on a Bluff Body with Variable Diffuser and Wheel Configurations,” SAE Technical Paper 2008-01-0326 2008 10.4271/2008-01-0326
- George, A.R. 1981 “Aerodynamic Effects on Shape Chamber, Pitch, and Ground Proximity on Idealized Ground Vehicle Body” ASME Journal of Fluid Engineering 0098-2202 103 631 638
- Senior, A.E. Zhang, X. 2001 “The Force and Pressure of a Diffuser-Equipped Bluff Body in Ground Effect” ASME Journal of Fluid Engineering 0098-2202 123 105 111
- Zhang, X. Senior, A. Ruhrmann, A. 2004 “Vortices Behind a Bluff Body with an Upswept Aft Section in Ground Effect” International Journal of Heat and Fluid Flow 0142-727X 25 1 9
- Buchheim, R. Deutenbach, K. R. Laxckoff, H. J. “Necessity and Premises for Reducing the Aerodynamic Drag of Future Passenger Cars” SAE Technical Paper 810185 1981 10.4271/810185
- Huminic, A. Huminic, G. “Computational Study of Flow in the Underbody Diffuser for a Simplified Car Model,” SAE Technical Paper 2010-01-0119 2010 10.4271/2010-01-0119
- Huminic, A. Huminic, G. Soica, A. 2011 “Study of aerodynamics for a simplified car model with the underbody shaped as a Venturi nozzle International Journal of Vehicle Design
- Ahmed, S. Ramm, G. Faltin, G. “Some Salient Features of the Time-Averaged Ground Vehicle Wake,” SAE Technical Paper 840300 1984 10.4271/840300
- Guilmineau, E. 2007 “Computational study of flow around a simplified car body” Journal of Wind and Industrial Aerodynamics 96 1207 1217 10.1016/j.jweia.2007.06.041
- Cogotti, A. “Ground Effect Simulation for Full-Scale Cars in the Pininfarina Wind Tunnel,” SAE Technical Paper 950996 1995 10.4271/950996
- Wickern, G. Zwicker, K. Pfadenhauer, M. “Rotating Wheels - Their Impact on Wind Tunnel Test Techniques and on Vehicle Drag Results,” SAE Technical Paper 970133 1997 10.4271/970133
- Huminic, A. Chiru, A. “On CFD Investigations of Vehicle Aerodynamics with Rotating Wheels' Simulation,” SAE Technical Paper 2006-01-0804 2006 10.4271/2006-01-0804
- Fabijanic, J. “An Experimental Investigation on Wheel-Well Flows,” SAE Technical Paper 960901 1996 10.4271/960901
- Regert, T. Lajos, T. 2007 “Description of flow field in the wheelhouses of cars” International Journal of Heat and Fluid Flow 28 616 629
- Le Good, G. Garry, K. “On the Use of Reference Models in Automotive Aerodynamics,” SAE Technical Paper 2004-01-1308 2004 10.4271/2004-01-1308
- Guilmineau, E. 2007 “Computational study of flow around a simplified car body” Journal of Wind and Industrial Aerodynamics 96 1207 1217 10.1016/j.jweia.2007.06.041
- Strachan, R. Knowles, K. Lawson, N. 2007 “The vortex structure behind an Ahmed reference model in the presence of a moving ground plane” Journal of Experiments on Fluids 42 5 0723-4864 659 669
- Versteeg, H.K. Malalasekera, W. 1995 “An introduction to computational fluid dynamics. The Finite Volume Method” Prentice-Hall Englewood Cliffs, N.J. 257
- Menter, F.R. 1994 “Two-equation eddy-viscosity turbulence models for engineering applications” AIAA Journal 0001-1452 32 1598 1605
- Wilcox, D.C. 1986 “Multiscale model for turbulent flows” AIAA 24th Aerospace Sciences Meeting American Institute of Aeronautics and Astronautics Reno, Nevada, USA
- Cogotti, A. “A Parametric Study on the Ground Effect of a Simplified Car Model,” SAE Technical Paper 980031 1998 10.4271/980031