Evaluation of aerodynamic characteristics of NREL Phase VI rotor system using 2 way fluid structure coupled analysis based on equivalent stiffness model

In this study, the evaluation of the aerodynamic characteristics of the NREL Phase VI Rotor System has been performed, for the 7m/s upwind case using commercial FEA and CFD tools which are ANSYS Mechanical 12.1 and CFX 12.1. The initial operating conditions of the rotor blade include a 3 .deg. tip pitch angle. A numerical simulation was carried out on only the rotor parts, excluding the tower structure based on the equivalent stiffness model, to consider the aeroelastic effect for the numerical simulation using the loosely coupled 2 way fluid structure interaction method. the blade root bending moment was monitored in real time to obtain reasonable results. To verify the analysis results, The numerical simulation results were compared with the measurements in the form of the root bending moment and the pressure distributions of the NREL/NASA Ames wind tunnel test