Active Drag Control for a Generic Car Model
Experimental and numerical investigations were carried out aiming at the reduction of the total aerodynamic drag of a generic car model by means of active separation control. For two different configurations separate control approaches were tested, taking into account the differences in the wake topology of the models. The targeted excitation of the respective dominant structures in the wake region leads to their effective attenuation. The experiments as well as the numerical simulations showed that a weakening of a spanwise vortex in the separated flow over the slant is strongly coupled with the occurrence of stronger streamwise vortices along the slant edges and vice versa.
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- Ahmed S.R., Ramm R. & Faltin G. (1984). Some Salient Features of the Time-Averaged Ground Vehicle Wake. SAE-Techn. Paper Series, 840300Google Scholar
- Hucho W.-H (2002). Aerodynamik der stumpfen Körper-Physikalische Grundlagen und Anwendung in der Praxis, Vieweg-VerlagGoogle Scholar
- Leder A (1992). Abgelöste Strömungen-Physikalische Grundlagen, Vieweg-VerlagGoogle Scholar
- Lienhart H., Stoots C. & Becker S. (2002). Flow and Turbulence Structures in the Wake of a Simplified Car Model (Ahmed model). In: Notes on Numerical Fluid Mechanics 77, Springer, 323–330Google Scholar
- Morel T. (1978). The Effect of Base Slant Angle on the Flow Pattern and Drag of Three-Dimensional Bodies with Blunt Ends. In: Proc. of Symp. Aerod. Drag Mechanisms of Bluff Bodies and Road Vehicles. Plenum Press, New York, 191–226Google Scholar
- Guilmineau E. & Duvigneau R. (2005). Drag reduction by flow control for the Ahmed body. In: Proc. of 4th Symposium on Bluff Body Wakes and Vortex-Induced Vibrations, Santorini, Greece, 21–24 June 2005, 247–250Google Scholar
- Roumeas M. & Gillieron P. & Kourta A. (2005). Analyze and control of the near-wake flow around a simplified car geometry. In: Proc. of 4th Symposium on Bluff Body Wakes and Vortex-Induced Vibrations, Santorini, Greece, 21–24 June 2005, 251–254Google Scholar