Abstract
The influence of undersurface design on aerodynamic drag and aerodynamic lift is considered. Wind tunnel flow conditions and special test rigs like sting suspensions are studied, and rotating wheels and moving ground are simulated in model and full-scale tests. Pressure distributions in the wheel cavity and on the road surface are followed, and model measurements on the velocity profile close to the wheel dependent on undersurface shape are made. Comparison is made of the undersurface flow between wind tunnel tests and road tests for various undersurface configurations (venturi-shape of the front part and diffusor-like shape of the rear part). Analogy considerations are made concerning the flow profile close to the ground surface. Remarks are made on the wake flow behind cars.
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