Abstract
The main causes of aerodynamic drag for automotive vehicles are the separation of flow near the vehicle's rear end. By reducing the drag it is possible to increase the fuel economy. To delay flow separation, vortex generators are tested for application to the roof end of a representative car model. It is commonly used on aircraft to prevent flow separation. Vortex generators themselves create drag, but they also reduce drag by preventing flow separation at downstream. In this paper the effect of vortex generators in the flow field and the mechanism by which these effects take place are studied. The paper also illustrates the computational fluid dynamics analysis of vortex generators in the representative car model. Various flow characteristics like pressure and velocity distribution, path line characteristics, vector flow, and wake studies at the rear end are discussed in detail.
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