Abstract
Abstract. In this article the aeroelastic loads on a 10 MW turbine in response to extreme events (low-level jet, shear, veer and turbulence intensity) selected from a year-long large-eddy simulation (LES) on a site at the North Sea are evaluated. These events are generated with a high-fidelity LES wind model and fed into an aeroelastic tool using two different aerodynamic models: a model based on blade element momentum (BEM) and a free vortex wake model. Then the aeroelastic loads are calculated and compared with the loads from the IEC standards. It was found that the loads from all these events remain within those of the IEC design loads. Moreover, the accuracy of BEM-based methods for modelling such wind conditions showed a considerable overprediction compared to the free vortex wake model for the events with extreme shear and/or veer.
Highlights
Given the ambitious targets to decarbonise the global energy system, further progress in wind turbine design remains high at the scientific agenda (Veers et al, 2019)
The present study shows overpredictions which are on the same order of magnitude, i.e. 14 % for the extreme level jet (LLJ), 11 % for the extreme veer case, 7 % for the extreme shear case but only 4 %–5 % for the extreme turbulence intensity and turbulent kinetic energy
This paper has described a study in which turbulent wind fields generated with large-eddy simulation (LES) were passed to the aeroelastic code PHATAS from the ECN part of TNO
Summary
Given the ambitious targets to decarbonise the global energy system, further progress in wind turbine design remains high at the scientific agenda (Veers et al, 2019). This article describes a study of the simulated loads on a wind turbine in response to extreme wind events modelled with an LES model. The work described in the present paper can be seen as a proof-of-concept study to explore the merits of using high-fidelity wind simulations as input for load calculations. Such site-specific simulations could someday be done more routinely in wind turbine and wind farm design and could eventually lead to a rethinking of the use of standard design load spectra.
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