NUMERICAL STUDY OF DRAG REDUCTION OF GENERIC VEHICLE BODY USING IMPINGING DEVICES

Paper in proceeding, 2013

Large Eddy Simulations are used to study passive flow control for drag reduction of simplified ground vehi- cle. 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 nu- merical simulations are compared with the experimen- tal 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 in- directly through the longitudinal vortices further down- stream