Abstract
The aerodynamic drag of a sedan vehicles is due to separation of flow near the vehicle’s rear end is one of the major causes. To delay flow separation, bump-shaped vortex generators are tested on the roof end. Commonly used on aircraft to prevent flow separation, vortex generators themselves create drag, but they also reduce drag by preventing flow separation at downstream. The overall effect of vortex generators can be calculated by sum of the positive and negative effects. Since this effect depends on the shape and size of vortex generators, those on the vehicle roof are optimized .This study presents the optimisation of various aerodynamic characteristics in a Sedan car using computational tools such as CFX and also by using experimental testing using scaled models in the wind tunnel.
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