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Drag Reduction for Trucks by Active Flow Control of the Wake Behind the Trailer

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1380
12 pages

M. El-Alti
Division of Fluid Dynamics, Department of Applied Mechanics, Chalmers University of Technology, Goteborg, Sweden

P. Kjellgren
Per Kjellgren Engineering, Nyvollhagen 9 4070 Randaberg, Norway; and Division of Fluid Dynamics, Department of Applied Mechanics, Chalmers University of Technology, Goteborg, Sweden

Lars Davidson
Division of Thermo and Fluid Dynamics, Department of Applied Mechanics, Department of Mechanical Engineering, Chalmers University of Technology, Hörsalvagen 7b, SE41296 Göteborg, Sweden


Several hundred large-eddy simulations with active flow control have been carried out to propose a novel rear end of a trailer. It is found that a reduction of aerodynamic drag by up to 25% or more is achieved for certain configurations. The reduction is mainly the result of a pressure recovery on the flap surface and the rear end of the trailer. The parameters of the novel rear end geometry and the variables of AFC are investigated. A thorough analysis of the mechanism of flow control and the flow characteristics of the forced and unforced case is reorted.

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