Paper Title
Numerical Simulation on Aerodynamic Performance of a Three-Bladed Darrieus �H Wind Turbine

Abstract
The purpose of this research work is to investigate computationally the improvement of the performance of the vertical-axis Darrieus-H wind turbine.The simulations of the aerodynamic field around a four-bladed straight �axis wind turbine (VAWT) are presented for different values of the Tip Speed Ratio λ (TSR), λ = 1.5 to λ = 3. Six different pitch angles are considered with symmetrical airfoil NACA0015. The Reynolds-Averaged Navier�Stokes equations are completed by the K- ώ SST turbulence model. Multiple Reference Frames (MRF) model capability of a computational fluid dynamics (CFD) solver is used to express the dimensionless form of power output of the wind turbine as a function of the wind freestream velocity and the rotor�s rotational speed. The results show that the optimized turbine experienced maximum power coefficient of 0.41 in tip speed ratio of 2.5 and in pitch angle 6� for CFD simulations. The experimental data from the literature and computational results were then compared for verification. Keywords� Wind Energy, Vertical Axis Wind Turbine, Computational Fluid Dynamics, Power Coefficient.