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“CDaero” - A Parametric Aerodynamic Drag Prediction Tool
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 23, 1998 by SAE International in United States
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The objective of the development of the aerodynamic drag predictive tool CDaero was for use as a module for the Automobile Design Support System (AutoDSS). CDaero is an empirically based drag coefficient predictive tool based initially on the MIRA (Motor Industry Research Association) algorithm. The development philosophy was to be able to predict the aerodynamic drag coefficient of an automobile with knowledge of the features of the surface geometry control curves. These are the curves that control the 3-dimensional geometry as seen in the profile, plan and front and rear views. CDaero has been developed in a computing environment using the equation solver TKSolver™. Fifty-one input feature values are first determined from the automobile geometry and then entered into the program. CDaero models the drag coefficient with thirteen different components covering the basic body, as well as additional components such as the wheels, mud flaps, etc. The components are then summed to obtain the total drag coefficient.
CitationCalkins, D. and Chan, W., "“CDaero” - A Parametric Aerodynamic Drag Prediction Tool," SAE Technical Paper 980398, 1998, https://doi.org/10.4271/980398.
- Calkins, D. E., Guan, L. and Koeser, L., “Automobile Conceptual Design Support System (AutoDSS),” SAE Technical Paper 960551, SAE International Congress & Exposition, Detroit, Michigan, 26-29 February, 1996.
- Guan, L., “Feature Based Aerodynamic Drag Coefficient Metamodel,” MS Thesis, University of Washington, Department of Mechanical Engineering, 1995.
- Carr, G. W., and Stapleford, W. R., “A Proposed Empirical Method for Predicting the Aerodynamic Drag of Cars,” Motor Industry Research Association (MIRA), England, Report No. 1981/1.
- Rose, M. J., “Appraisal and Modification of the Empirical Method for Predicting the Aerodynamic Drag of Cars,” Motor Industry Research Association (MIRA), England, Report No. 1986/1.
- Howard, G., “Automobile Aerodynamics-Theory and Practice for Road and Track,” Osprey Publishing Limited, London, 1986.
- Chan, W. T., “An Aerodynamic Drag Coefficient Evaluation Tool for Automobile Design,” MS Thesis, University of Washington, Department of Mechanical Engineering, 1997.
- TKSolver™, Universal Technical Systems, Inc., Rockford, Illinois.
- Williams, J. and Quinlan, W. J., Hackett, J. E. and Thompson, S. A., and Marinaccio, T. and Robertson, A. S., “A Calibration Study of CFD for Automotive Shapes and CD,” SAE Technical Paper 940323, 1994.