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Blade element momentum (BEM) theory continues to be widely used for wind turbine applications such as initial aerodynamic analysis, conceptual design, loads and stability analysis, and controls design. Recent advances in deriving a robust solution algorithm for BEM theory [1] and establishing a new modularization framework for FAST [2] have prompted development of a new version of AeroDyn. One aspect of that development is in the treatment of skewed wakes (for yawed or tilted flows). Skewed wakes have renewed interest in the wind engineering community as research on wind plant underproduction has led to studies on wake steering using control of the yaw error. Of course, even without this type of control, skewed wakes are always prevalent for turbines operating under stochastic wind conditions. The previous version of AeroDyn used only a simple skewed wake correction method. Several …