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“CDaero” - A Parametric Aerodynamic Drag Prediction Tool
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Abstract
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.
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Authors
Citation
Calkins, D. and Chan, W., "“CDaero” - A Parametric Aerodynamic Drag Prediction Tool," SAE Technical Paper 980398, 1998, https://doi.org/10.4271/980398.Also In
References
- Calkins, D. E. Guan, L. 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,” University of Washington, Department of Mechanical Engineering 1995
- Carr, G. W. Stapleford, W. R. “A Proposed Empirical Method for Predicting the Aerodynamic Drag of Cars,” Motor Industry Research Association (MIRA) England
- Rose, M. J. “Appraisal and Modification of the Empirical Method for Predicting the Aerodynamic Drag of Cars,” Motor Industry Research Association (MIRA) England
- 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,” University of Washington, Department of Mechanical Engineering 1997
- TKSolver™ Universal Technical Systems, Inc. Rockford, Illinois
- Williams, J. Quinlan, W. J. Hackett, J. E. Thompson, S. A. Marinaccio, T. Robertson, A. S. “A Calibration Study of CFD for Automotive Shapes and CD,” SAE Technical Paper 940323 1994