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Two integral CFD methods for the simulation of steady-state and transient vehicle aerodynamics, respectively, are described in this paper. Both codes couple potential flow and boundary layer schemes with simple, thin-shear-layer wake models which ensure relatively fast computational times. Calculations of the steady-state yaw effects for the Corvette ZR-1 compare favorably with experimental pressure data located on the hood. Furthermore, the code's rapid computational speed makes multiple design simulations even on today's low-end workstations quite practical. Finally, time-stepping calculations of an unsteady pitching motion of the Corvette ZR-1 demonstrates one example of the current capability of the unsteady computational method.

An iterative viscous/potential flow calculation method is described in this paper. A potential-flow panel method is coupled with integral boundary layer methods. Simple linear doublet sheets are used to enclose the low-energy separated-flow region of the wake. Calculations for various body shapes demonstrate that unseparated flow pressure distributions are accurately calculated. Body lift trends are also properly computed for a simple body with separation only at the base and in close ground proximity. However, the prediction of average base pressure is only partially successful. The base pressures for a limited number of geometries, which include a Porsche 924, are properly predicted, but calculations for other shapes indicate that the separated-flow wake model must be improved for general body shapes.