Vibrations of wind turbine blades in standstill: Mapping the influence of the inflow angles

The present investigation used numerical simulations to study the vibrations of a wind turbine blade in standstill. Such are presumed affect horizontal axis designs and can jeopardize structural integrity machine. applied methods relied on fluid–structure interaction (FSI) approach, coupling computational fluid dynamics (CFD) solver with multibody finite-element solver. A 96-m-long was studied for large parametric space, accounting variation both pitch inclination. inclination defined as angle between freestream velocity cross-sectional plane at root, allowing introduction flow component spanwise direction. corresponded rotation inflow around axis, steering angles attack seen by airfoils. Two regimes were characterized, depending considered range angle. For high inclinations, leading clustered particular region appearance oscillations accompanied synchronization loading frequency motion. At low angles, mechanism triggering relatively similar, even if excitation spectrum richer, critical seemed be more scattered. Regardless inflow, problem highly three-dimensional, several complex phenomena such oblique shedding phase dislocations identified.