Abstract The aerodynamic characteristics of NACA4412 airfoil with different pitching motion elements were compared and analyzed based on CFD in this research. results are acquired as follows: the difference between lift drag coefficients during pitch up down motions becomes larger increase amplitude or initial angle attack; increases, coefficient grows slightly greater much greater; attack slig...

Abstract Based on CFD, the flow field characteristics of NACA4412 airfoil are analyzed under pitching motion, and its aerodynamic interpreted. The results show that streamline changes upper surface play a decisive role in characteristics. interaction between vortex leads to fluctuations lift drag coefficients. Under big angle attack, secondary trailing adheres edge airfoil, resulting an increas...