Key words: Streamfunction-vorticity formulation, Control volume based on finite element method, NACA 23015, POD analysis.

Abstract: To study the flow dynamic behavior of the NACA 23015 airfoil, used in many commercialized wind turbine, a computational fluid dynamic solving the streamfunction-vorticity formulation of Navier-Stokes equations using the Control Volume Method based on Finite Element (CVMFE) have been made to simulate the flow over the NACA 23015 at high angle of attack equal to 14° for Reynolds number equal to 1000. The Proper Orthogonal Decomposition (POD) method is adopted to analyze and extract the coherent motion structures in the flow behind the airfoil and the first two modes are used to determine the phase of the vortex shedding.