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

Paper i 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