Currently, most wind turbine performance analyses and simulations are performed assuming constant pitch yaw angles during each rotation. Nevertheless, induced vibration or rotor imbalance can affect the angle within In this study, effects of low-amplitude sinusoidal oscillations blade on a was investigated numerically by comparing it against baseline (without variations). Large eddy were in whi...

This paper presents the parameterization and optimization of two well-known airfoils. The aerodynamic shape investigation includes subsonic (NREL S-821) transonic airfoils (RAE-2822). class transformation is employed for parametrization while genetic algorithm used purposes. absolute scheme process carried out minimization drag coefficient maximization lift to ratio. In-house MATLAB code incorp...

Wind energy is one of the clean renewable energy. However, the low frequency (20-200HZ) noise generated from the wind turbine blades, which bothers the residents, becomes the major problem to be developed. It is useful for predicting the aerodynamic noise by flow field and pressure distribution analysis on the wind turbine blades. Therefore, the main objective of this study is to use different ...

iv ACKNOWLEDGEMENTS I would like to express my sincere gratitude to my thesis advisor, Prof. Blair Perot, for his continuous interest, support and guidance during this study. I am also thankful to Prof. Matthew Lackner and Prof. Ashwin Ramasubramaniam for their advice and help. I specially wish to thank Chris Zusi for the all the support and great suggestions he gave me during my research as we...

This study demonstrates the separation and transition flow behaviour around a 3-D wind turbine blade by analysing blending functions, intermittency, onset Reynolds number in SST Gamma Theta model. The National Renewable Energy Laboratory Phase VI rotor was modelled for analysis. simulations were executed using ANSYS-CFX solver. Extensive comparisons performed to demonstrate accuracy of this num...

Several studies show that the Low-Frequency Noise (LFN) of wind turbines could have harmful effects on human health even when it is infrasound. In traditional classifications, the LFN of upwind turbines is referred only to steady thickness and steady loading sources, and the effect of vortices is considered negligible. In this study, the LFN of a horizontal axis wind turbine is simulated in win...

The aerodynamic analysis of wind turbine rotors using preconditioned weighted essentially non-oscillatory scheme to solve the compressible NavierStokes equations in non-inertial coordinate system with Spalart-Allmaras one equation turbulence model is presented. A parallel clustering algorithm based on Message Passing Interface library was implemented. The NREL Phase VI rotor with S809 airfoil w...