Aerodynamics of two trucks driving in close-proximity
Although there is interest in this topic, a lack of understanding remains concerning the phenomena that cause changes in drag when two or more vehicles are traveling in a platoon. Furthermore, the behavior of platooning cab over engine style trucks that are common in the European Union is not well understood. The focus of this work lies in understanding such a system’s behavior and producing data that shows the changes in drag observed for two cab over engine style trucks driving in close proximity.
The work was split into two different studies: the initial part was based on numerical results, and the second on experimental ones obtained in the Volvo Cars wind tunnel. The results show that the behavior of the leading truck is simple, where a closer inter-vehicle distance will mean a lower drag. The trailing truck has a more complex behavior, where there are both local minima and maxima with respect to the drag experienced as the separation distance between the vehicles is reduced. The effects that cause the changes in drag are many but can be generally defined as the leading truck mainly being affected by differences in pressure, and the trailing truck affected mainly by changes in the flow due to the wake of the leading vehicle. The combined changes in drag of the two vehicles result in a continuous decrease in drag with a reduced inter-vehicle distance.
cab over engine
Chalmers, Mekanik och maritima vetenskaper, Fordonsteknik och autonoma system
Aerodynamik vid platooning med olika fordonsslag: optimering av framtida transportlösningar
Energimyndigheten, 2018-01-02 -- 2021-12-31.
Övrig annan teknik
Strömningsmekanik och akustik
C3SE (Chalmers Centre for Computational Science and Engineering)
Thesis for the degree of Licentiate – Department of Mechanics and Maritime Sciences: 2021:15
Chalmers tekniska högskola
Opponent: Dr. Geoff Le Good, Vehicle Aerodynamics, National Transport Design Centre, Coventry University