An effective method of designing low drag, attached flow automobile forebodies has been developed. Based on a potential flow panel method, a series of computer programs is used to define idealized pressure gradients at several forward corner locations including the hood, fender, windshield header and A-pillar. Idealized pressure gradients for several radii at each corner location are analyzed using a turbulent boundary layer separation criterion to determine if real-world viscous flow will remain attached. Correlation with wind tunnel test results is included. A non-circular, attached flow hood corner shape is developed based on the separation criterion and an inverse (geometry defining) computer method.
Analysis and design of automobile forebodies using potential flow theory and a boundary layer separation criterion
Untersuchung und Entwurf der Vorderteile von Kraftfahrzeugen mit Hilfe der Potentialstroemungstheorie und einem Grenzschichttrennungskriterium
SAE-Papers ; 1-21
1983
21 Seiten, 34 Bilder, 25 Quellen
Aufsatz (Konferenz)
Englisch
SAE Technical Papers | 1983
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