Title: Active procedures to control the flow past the Ahmed body with a 25° rear window

Authors: Charles-Henri Bruneau, Emmanuel Creuse, Delphine Depeyras, Patrick Gillieron, Iraj Mortazavi

Addresses: IMB, Universite Bordeaux 1, Team MC2 INRIA Bordeaux-Sud-Ouest, UMR 5251 CNRS 351 cours de la Liberation, F-33405 Talence, France. ' Laboratoire Paul Painleve Universite Lille 1, Sciences et Technologies, Team SIMPAF INRIA Lille Nord Europe, UMR 8524 CNRS, Cite Scientifique, F-59655 Villeneuve d'Ascq, France. ' IMB, Universite Bordeaux 1, Team MC2 INRIA Bordeaux-Sud-Ouest, UMR 5251 CNRS 351 cours de la Liberation, F-33405 Talence, France. ' Technocentre Renault, Direction de La Recherche, Mecanique des uides et aerodynamique, DREAM/DTAA 1, Avenue du Golf F-78288, Guyancourt, France. ' IMB, Universite Bordeaux 1, Team MC2 INRIA Bordeaux-Sud-Ouest, UMR 5251 CNRS 351 cours de la Liberation, F-33405 Talence, France

Abstract: Ahmed body with a 25° rear window is used to represent a simplified car geometry. Two- and three-dimensional simulations are performed to analyse the flow behaviour around such a vehicle. Sucking and blowing jets or slots are added on the body to control the flow. The results presented show that good drag reductions are achieved for a good choice of the active procedure.

Keywords: direct numerical simulation; active control; flow control; Ahmed body; rear windows; automotive aerodynamics; drag reduction.

DOI: 10.1504/IJAD.2011.038847

International Journal of Aerodynamics, 2011 Vol.1 No.3/4, pp.299 - 317

Published online: 28 Feb 2015 *

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