An Engineering-Level Vortex Induced Vibration Methodology for Parked-Load Assessment

Abstract. Vortex-induced vibration (VIV) can increase cyclic loading of stationary and slowly moving bluff bodies. Assessing parked wind-turbine loads across winds and blade orientations requires design sweeps that are costly with blade-resolved fluid–structure simulations. We couple QBlade's native aeroelastic response to fixed-body lift and drag spectra through a calibrated, finite-amplitude response law. Sectional data set the coefficients for an H-rotor vertical-axis wind turbine (H-VAWT); separate blade studies train the same law and test a response map on an excluded tip geometry. A turbulent-inflow H-VAWT example compares native QBlade, Spectral VorLap, and Hybrid VorLap under prescribed slow idling. Hybrid VorLap increases the conditional edgewise damage-equivalent load by a factor of 2.63, but flapwise bending still controls the combined longitudinal stress. Comparison with approximate normal operation shows that fatigue ranking depends on wind exposure and the assumed high-cycle material law. Extreme-wind longitudinal stress changes little at the monitored sections. The method supports selection of candidate VIV load cases for detailed analysis, but requires application-specific spectral and response data for quantitative use.