Abstract
Large Eddy Simulations are used to study passive flow control for drag reduction of simplified ground vehicle. Add on devices in form of short cylinders are used for formation of streaks in the streamwise direction leading to the separation delay. The result of the present numerical simulations are compared with the experimental data showing good agreement. The two-stage flow control mechanism is analyzed from the LES results. It was found in agreement with the previous experimental observations that the counter-rotating vortices behind the impinging devices influence the separation only indirectly through the longitudinal vortices further downstream.
