This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Three Dimensional Bluff Body Aerodynamic Analysis for Automotive and Automotive Racing Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
Published December 05, 2006 by SAE International in United States
Annotation ability available
With energy conservation and pollutant emission of paramount importance in today's society, it has emphasized the need for aerodynamic drag reduction in the automotive sector. Innovative ideas, better visualization, reduced time in the design process, and cost effective “computational testing” is all put together is the use of Computational Fluid Dynamics. In the present study the analysis of the complex flow structure around a bluff body is presented. The importance and advantages of the numerical simulations are discussed. The quality of the mesh is of great importance and the types of grid generation schemes are presented here. The shape of the rear of the body has a marked influence on the body drag. The importance of the back slant angle and its effect on the flow structure and in turn its effect on the drag force of the body is presented. The importance of computational fluid dynamics in the field of racing applications whereby the flow field for cars in draft or cars in a cross flow that cannot be investigated in the wind tunnel are presented and discussed. The accuracy of the computational calculations is validated by comparison with available experimental data. The computational results are in good agreement with the experimental results.
CitationMicklow, G., Kotha, S., and Abdel-Salam, T., "Three Dimensional Bluff Body Aerodynamic Analysis for Automotive and Automotive Racing Applications," SAE Technical Paper 2006-01-3644, 2006, https://doi.org/10.4271/2006-01-3644.
- Ahmed, S.R Ramm, G. “Some Salient Features of the Time-Averaged Ground Vehicle Wake” SAE paper 840300 1984
- Viswanath, P.R “Drag Reduction of Afterbodies by Controlled Separated Flows” AIAA Journal 39 1 Jan 2001
- Han, T. Hammond, D. Sagi C.J. “Optimization of Bluff body for Minimum Drag in Ground Proximity” AIAA Journal 30 4 882 889 April 1992
- Morel, T. “Aerodynamic Drag of Bluff Body Shapes Characteristic of Hatchback Cars” SAE 1978
- Han, T. “Computational Analysis of Three Dimensional Turbulent Flow around a Bluff Body in Ground Proximity” AIAA 27 9 1213 1219 September 1989
- Chok, C. Parameswaran, S. Sun, R. Gleason M. “Numerical Effects of the Base Slant on the Wake Pattern and Drag of Three dimensional bluff bodies with rear blunt end” Journal of Wind Eng and Industrial Aerodynamics 51 269 285 1994
- Rodi, W. “On the Simulation of Turbulent Flow past Bluff Bodies” Journal of Wind Eng and Industrial Aerodynamics 46 47 1993
- Tagayashi, Y. “Numerical Investigation of Vehicle Aerodynamics with Overlaid Grid System” SAE paper 950628 1995
- Okumura, K. Kuriyama T. “Practical Aerodynamic Simulations using Turbulence Model with Third Order Upwind Scheme” SAE paper 950629 1995
- Takagi, M. “Application of Computers to Automobile Aerodynamics” Journal of Wind Eng and Industrial Aerodynamics 33 419 428 1990
- Fluent Flow Modeling Software www.fluent.com
- Kotha, S. “Three Dimensional Bluff Body Aerodynamic Analysis for Automotive and Automotive Racing Applications” University of North Carolina Charlotte May 2005
- Jenkins, L. N. “An Experimental Investigation of the Flow over the Rear End of a Notchback Automobile Configuration” SAE paper 2000-01-0489 2000