The flow around a simplified tractor-trailer model studied by large eddy simulation
Artikel i vetenskaplig tidskrift, 2012

Large-eddy simulation (LES) is used to study the flow around a simplified tractor-trailer model. The model consists of two boxes placed in tandem. The front box represents the cab of a tractor-trailer road vehicle and the rear box represents the trailer. The LES was made at the Reynolds number of 0.51×106 based on the height of the rear box and the inlet air velocity. Two variants of the model were studied, one where the leading edges on the front box are sharp and one where the edges are rounded. One small and one large gap width between the two boxes were studied for both variants. Two computational grids were used in the LES simulations and a comparison was made with available experimental force measurements. The results of the LES simulations were used to analyze the flow field around the cab and in the gap between the two boxes of the tractor-trailer model. Large vortical structures around the front box and in the gap were identified. The flow field analysis showed how these large vortical structures are responsible for the difference in the drag force for the model that arises when the leading edges on the front box are rounded and the gap width is varied.

Large eddy simulation

Tandem configuration

Bluff body aerodynamics


Gap flow

Simplified tractor-trailer


Jan Östh

Chalmers, Tillämpad mekanik, Strömningslära

Sinisa Krajnovic

Chalmers, Tillämpad mekanik, Strömningslära

Journal of Wind Engineering and Industrial Aerodynamics

0167-6105 (ISSN)

Vol. 102 36-47


Hållbar utveckling






Strömningsmekanik och akustik



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