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Drag Optimization of Light Trucks Using Computational Fluid Dynamics
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 26, 2004 by SAE International in United States
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There are 80 million light trucks on the road today with suboptimal aerodynamic forms. Previous research has found that several miles per gallon can be saved by specifically tailoring truck bodies for reduced aerodynamic drag. Even greater savings can be obtained if the shape of the trucks is numerically optimized. This could reduce fuel consumption in the United States by billions of gallons per year.
This paper demonstrates a method for drag reduction using CFD and traditional numerical optimization techniques. A method for efficient design variable reduction for CFD optimization of three-dimensional shapes is also presented and applied to light trucks. The optimized form is then physically constructed and installed on a recent model pickup truck. The vehicle is tested in several configurations and the effects on fuel economy are compared to the CFD prediction.
The results indicate that the CFD formulation provides an accurate predictor for improving fuel economy and drag characteristics. The prototype air dam and optimally shaped canopy generated a 21.23% savings in terms of fuel economy. This corresponded to an improvement in fuel economy from 19 mpg to 23.17 mpg. Ultimately, this research demonstrates a practical example of geometric optimization and validates the results with a full scale test.
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CitationWilliams, N., Gordis, J., and Letherwood, M., "Drag Optimization of Light Trucks Using Computational Fluid Dynamics," SAE Technical Paper 2004-01-2617, 2004, https://doi.org/10.4271/2004-01-2617.
- NASA http://www.grc.nasa.gov/WWW/K-12/airplane/drag1.html September 21 2003
- http://www.fhwa.dot.gov/ohim/onh00/line2.htm September 21 2003
- http://www.freep.com/money/autonews/cafe2_20030402.htm September 21 2003
- Saltzman E. J. Meyer R. R., Jr. “A Reassessment of Heavy-Duty Truck Aerodynamic Design Features and Priorities” NASA Report Number: NASA-TP-1999-206574 1999 1 37
- Wong J. Y. Theory of Ground Vehicles 2nd Ed New York, NY John Wiley and Sons, Inc. 1993
- White F. M. Fluid Mechanics 4th Ed Boston, MA WCB McGraw-Hill 1999
- Versteeg H. K. Malalasekera W An Introduction to Computational Fluid Dyanmics Essex, England Longman Scientific and Technical 1995
- Booch G. The Unified Modeling Language User Guide New York, NY Addiso-Wesley 1998
- Samareh J. A. “A Survey of Shape Parameterization Technique” CEAS/AIAA/ICASE/NASA Langley International Forum on Aeroelasticity and Structural Dynamics June 1999 333 343
- Braibant V. Fleury C. “Shape Optimal Design Using B-Splines,” Computer Methods in Applied Mechanics and Engineering 44 3 1984 247 267
- CFD Research Corporation CFD-ACE+™ Simulation Manager: Script Based Simulation Reference Manual and Tutorials (Version 2002) Huntsville, AL 2002
- CFD Research Corporation CFD-GEOM™ Interactive Geometric Modeling and Grid Generation Software (Version 2002) Huntsville, AL 2002
- CFD Research Corporation CFD-ACE(U)™ User Manual (Version 2002) Huntsville, AL 2002
- Belegundu A.D. Chandraupatla T. R. Optimization Concepts and Applications in Engineering Upper Saddle River, NJ Prentice Hall, Inc. 1999
- Williams N.A. DRAG OPTIMIZATION OF LIGHT TRUCKS USING COMPUTATIONAL FLUID DYNAMICS 2003
- September 21 2003