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Experimental and numerical study of flow structures between two Ahmed bodies with various inter-body distances

M. Mirzaei
Division of Fluid Dynamics, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, Sweden

A. Pavlenko
Division of Fluid Dynamics, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, Sweden

Sinisa Krajnovic
Department of Mechanics and Maritime Sciences (M2), Chalmers University of Technology, Goteborg 41296, Sweden

Valery G. Chernoray
Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg, Sweden

Abstract

Numerical and experimental study of mutual interaction of flow structures in a two-vehicle platoon is presented in this paper. The investigations were conducted for the vehicles distances in the range of d/L = 0−1.3 at Re = 130, 000. The experimental observations showed a sudden unexpected drag increase of the follower at specific close distances of the bodies in which, the velocity fluctuations of the shear layer separated from the leader suddenly increases. Accurate PANS numerical simulations were performed at three alternative close distances of the bodise which increased understanding of the flow structures.

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