Improving aerodynamic performance of a truck: a numerical based analysis

Authors: Malmberg, , Sundström, E.S., Mihaescu, M
Document Type: Conference
Pubstate: Accepted
Journal: Svenska Mekanikdagar, Linköping, Sweden, June 10-12, 2015
Year: 2015


With a recent change on EU-legislation regarding the dimensions of heavy trucks, specifically allowing aerodynamic devices fitted to the back of trailers, the transportation industry is set to largely decrease its environmental impact in the near future. These aerodynamic devices have been researched for quite some time, but have not yet gained widespread market acceptance, partly because of the transportation industry's complex owner structures and partly because of size regulations of the past. Though with this new legislation and other expected new EU-legislation on CO2 emissions, development of these aerodynamic devices looks set to become a field of intense study. The study explores different options regarding shaping the flow in the wake of a generalized ground transportation system (GTS), a simplified model of a truck geometry. By shaping the flow the drag force induced by the oncoming air flow was reduced, and the overall coefficient of drag (Cd) value lowered. Computational Fluid Dynamics (CFD), in the form of the commercial computer software STAR-CCM+, was used to simulate the flow around the GTS, and the results were verified with similar studies and experiments 3 on the same geometry.