الفهرس 
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Abstract
Active flow control gained more attention nowadays as it directly manipulates the flow over the surface efficiently and develops the path into a more desired state when it is requested to operate. The Dielectic Barrier Discharge (DBD) plasma actuators, which is one of the active flow control, generate nonthermal plasmas -using low input energies and limited temperature rise- across two parallel asymmetric electrodes, accelerates the airflow and a wall jet-type of flow to be induced causing reattachment of the flow over the surface. The present study investigates the active flow control on NACA0012 airfoil numerically by introducing dielectric barrier discharge (DBD) plasma actuators. The flow over the airfoil simulations was performed using ANSYS program for free-stream velocity 14.6 m/s with a wide range of angles of attack with applied AC voltage 16 kV across the electrodes. There are several plasma actuator models, which simulate the effect of the plasma actuator. The present study focuses on two numerical methods: Shyy model and Suzen model. They depend on calculating the induced body force of the plasma and import it in Navier Stokes equation as an external body force. A Mesh independence study is performed on the airfoil and validation of the results without plasma activation with the experimental results was conducted. Two actuators were added at positions 0.1 and 0.3 of the chord length to the airfoil and an investigation is performed on the lift CL and drag Cd coefficients of the airfoil without and with the activation of the plasma. Thereafter, a comparison between numerical results of the two different plasma simulation models is performed to check the accuracy of each model and the two simulation models give nearly the same results. While the activation of the plasma actuators, the performance of the airfoil is improved, 6.1% more lift is obtained, and the stall angle is increased by 2 degrees. Afterwards, the difficulties of modelling and simulation problems concerning the convergence of the solution and the stability of each model are discussed.