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Abstract
The present investigation used numerical simulations to study the vortex induced vibrations (VIVs) of a 96 m long wind turbine blade. The results of this baseline shape were compared with four additional geometry variants featuring different tip extensions. The geometry of the tip extensions was generated through the variation of two design parameters: the dihedral angle bending the blade out of the rotor plane and the sweep angle bending the blade in the rotor plane. The applied numerical methods relied on a fluid structure interaction (FSI) approach, coupling a computational fluid dynamics solver with a multibody structural solver. The methodology followed for locating VIV regions was based on the variation of the inclination angle. This variable was defined as the angle between the freestream velocity and the blade axis, being 0° when these vectors were normal and positive when a velocity component from tip to root was introduced. For the baseline geometry, the FSI simulations predicted significant blade vibrations for inclination angles between 47.5° and 60° with a maximum peaktopeak amplitude of 2.3 m. The installation of the different tip extensions on the blade geometry was found to significantly modify the inclination angles where VIV was observed. In particular, the simulations of three of the tip designs showed a shifting of several degrees for the point where the maximum vibrations were recorded. For the specific tip geometry where only the sweep angle was taken into account, a total mitigation of the VIV was observed.
Original language  English 

Article number  065104 
Journal  Physics of Fluids 
Volume  32 
Issue number  6 
Number of pages  31 
ISSN  10706631 
DOIs  
Publication status  Published  2020 
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Dive into the research topics of 'Vortex induced vibrations of wind turbine blades: Influence of the tip geometry'. Together they form a unique fingerprint.Projects
 1 Finished

SmartTip: Smart Tip
Barlas, A., McWilliam, M., González Horcas, S., Zahle, F., Verelst, D. R., Pirrung, G., Ramos García, N., Castro Ardila, O. G. & Andersen, T.
01/12/2017 → 30/11/2020
Project: Research
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