Full-Scale Simulations of Drag Reduction Devices for Class 8 Trucks

Computational Fluid Dynamics (CFD) simulations were performed to evaluate drag reduction devices on a modified full-scale version of the Generic Conventional Model (GCM) geometry. All simulations were performed with a moving ground plane and rotating rear wheels. A trailer base flap simulation was performed for comparison with drag reduction data from wind tunnels and track and road tests. A front spoiler and three mud-flaps with modest drag reduction potential were evaluated in view of their higher probability of adoption by truck fleet operators.