The Analysis of the Effect of the Spoiler Structures on the Truck Trailer Vehicle to Coefficient Drag by Computational Fluid Mechanics

In this study, aerodynamic forces which effect to a truck and trailer combinations were investigated with computational fluid me-chanics method. the force measurement were performed for the model truck trailer and aerodynamic drag coefficient (cd) was determined numerically in 4 different free flow velocity on the fluent® program. numerical analysis of flow were made on the 312 000 - 844 000 reynolds number. the friction and pressure based drag force distributions were determined. a spoiler de-signed to improve the drag force for the base model. % 20,9 improvement obtained for the aerodynamic drag coefficient. the flow structure around the truck and trailer and pressure coefficient distributions.