13 th Annual & 2 nd International Fluid Dynamics conference Fd2010-26-28 Oct. Shiraz University Shiraz Iran 1 COMPUTATIONAL STUDY OF AERODYNAMIC DRAG REDUCTION ON AHMED BODY USING ACTIVE STRATEGIES Mohammad Abbaspour, Mohsen Jahanmiri† M.Sc. Student of Mechanical Engineering †Associate Professor of Aerospace Engineering Department of Mechanical & Aerospace Engineering, Shiraz University of Technology E-mail: abbaspour.mohammad@gmail.com †E-mail: jahanmiri@sutech.ac.ir Keywords: Aerodynamic drag reduction, Active flow control, Ahmed model Abstract. Aerodynamic drag is an important factor in vehicles fuel consumption. Pressure drag which is the main component of total drag is a result of boundary layer separation from vehicle surface. Flow control methods are applied to avoid or at least delay separation. Depending upon whether these methods consume energy to control the flow or not, they are called active or passive control methods. In this paper, the effect of boundary layer suction and base blowing-as active control methods- on drag reduction of two-dimensional Ahmed model is investigated numerically. Four different control mass flow rates are also studied. Furthermore, two different areas for blowing section are considered to investigate the effect of change in blowing section area. Finally, the obtained results are compared with the data from simulations already carried out for the case in which only suction is applied. To validate the results three different turbulence models are used.