A methodology for aeroelastic analysis of Vertical Axis Wind Turbines (VAWTs) with troposkien geometry is developed. The structural dynamic equations used in this analysis represent the behavior of a three dimensionally curved beam in a mixed form consisting of generalized force and generalized displacement vectors. This linear formulation, which takes into account both the Coriolis and centrifugal stiffening effects, lends itself well to the application of mixed finite element method. The structural dynamic equations are then coupled with a vortex filament based aerodynamic model. These vortex filaments that stretch, rotate and translate freely in the wake of the wind turbine represent the unsteady effect of the wake accurately, specially when the vortex-blade interaction is strong at hight tip speed ratios. The aforementioned computational aeroelastic methodology is utilized to study the aeroelastic behavior of the 17-meter DOE-Sandia VAWT. The comparison of the estimated vibratory stress at the root of wind turbine with the experimental data reveals excellent agreement except at the region where dynamic stall plays a crucial role in predicting the aerodynamic forces.

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Conference 32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014
Fereidooni, A. (Amin), Nitzschet, F. (Fred), & Matida, E. (2014). Aeroelastic study of a vertical axis wind turbine with troposkien shape. Presented at the 32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014.