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This dissertation serves to summarize my research into wind farm and wind turbine aerodynamics. Included in this thesis is a summary of the methods I use as well as the four research problems that I investigated. Motivation is provided for my research as well as an overview of the computational methods that I use. These methods include analytical methods such as blade element momentum (BEM) theory and the vortex lattice method as well as computational fluid dynamic methods like the Reynolds averaged Navier-Stokes (RANS) equations and large eddy simulation (LES). These methods are used to investigate wind turbine and wind farm aerodynamics. In particular, I use these methods to confront the various forms of loss that wind turbines and wind farms experience. They include the losses that individual turbines experience due to swirl, induction, and viscosity as well as the loss that wind farms experience due to turbine-wake interaction. Horizontal axis wind turbines (HAWTs) suffer from aerodynamic ineffciencies in the blade root region (near the hub) due to several non-aerodynamic constraints. Aerodynamic interactions between turbines in a wind farm also lead to signifcant loss of wind farm efficiency. A new dual-rotor wind turbine (DRWT) concept is proposed that aims at mitigating these two losses. A DRWT is designed that uses an existing turbine rotor for the main rotor, while the secondary rotor is designed using a high lift-to-drag ratio airfoil. Reynolds Averaged NavierStokes computational fluid dynamics simulations are used to optimize the design. Large eddy simulations confirm the increase energy capture potential of the DRWT. Wake comparisons however do not show enhanced entrainment of axial momentum. I extend the prescribed wake vortex lattice method (VLM) to perform aerodynamic analysis and optimization of dual-rotor wind turbines. The additional vortex system introduced by the secondary rotor of a DRWT is modeled while taking into account the singularities that occur when the trailing vortices from the secondary (upstream) rotor interact with the bound vortices

A Computational Analysis of Wind Turbine and Wind Farm Aerodynamics with a Focus on Dual Rotor Wind Turbines