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Influence of Reynolds number on the fluid-structure interaction characteristics of vertical-axis wind turbine blades under parking conditions
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DOI：10.1177/0309524X261427551.png)
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Abstract
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With the increasing scale of vertical-axis wind turbines (VAWTs), the aeroelastic behavior of long and flexible blades poses significant challenges to their structural dynamics. To investigate these effects, a two-way fluid-structure coupling approach was employed using a single VAWT blade under standstill conditions (0 degrees angle of attack). Simulations across various Reynolds numbers (Re) revealed that the dominant vibration modes were flapwise and edgewise, concentrated in low-order modes, while torsional vibration appeared only in higher-order modes. Periodic oscillations of lift and drag were driven by structural vibrations. As Re increased, the blade's dynamic response evolved from a single mode to multiple coupled modes, with new frequency components aligned with the inflow direction showing characteristics of first-order flapwise motion. At high Re, intensified aerodynamic load fluctuations induced multimodal coupling and more complex responses, highlighting pronounced aeroelastic instability.
Keywords:
vertical-axis wind turbine
fluid-structure interaction
spectral analysis
modal analysis
parking conditions
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