Abstract
Turbulent wind at offshore sites is known as the main cause for fatigue on offshore wind turbine components. Numerical simulations are commonly used to predict the loads and motions of floating offshore wind turbines; however, the definition of representative wind input conditions is necessary. In this study, the load and motion responses of a spar-type Offshore Code Comparison Collaboration (OC3) wind turbine under different turbulent wind conditions is studied and investigated by using SIMO-Riflex in Simulation Workbench for Marine Applications (SIMA) workbench. Using the two spectral models given in the International Electrotechnical Commission (IEC) standards, it is found that a lower wind lateral coherence under neutral atmospheric stability conditions results in an up to 27% higher tower base side–side bending moment and a 20% higher tower top torsional moment. Comparing different atmospheric stability conditions simulated using a spectral model based on FINO1 wind data measurement, the highest turbulent energy content under very unstable conditions yields a 26% higher tower base side–side bending moment and a 27% higher tower top torsional moment than neutral conditions, which have the lowest turbulent energy content and turbulent intensity. The yaw-mode of the OC3 wind turbine is found to be the most influenced component by assessing variations in both the lateral coherence and the atmospheric stability conditions.
Highlights
The design phase of a wind turbine is considered as one of the most critical steps in wind farm planning
The results are divided into three subsections: the simulated wind turbulence in terms of wind turbulence box properties for each load case, the natural frequencies of the OC3 wind turbine, as well as the load and platform motion responses
The present study was motivated by previous studies [6,7,8] which suggest that the wind spatial
Summary
The design phase of a wind turbine is considered as one of the most critical steps in wind farm planning. Many research studies rely on numerical simulations to predict and check the reliability of the wind turbine structures, especially those located offshore. For this reason, a justifiable environmental input must be chosen carefully, and reliable measurement data should be used whenever available. 61400-1, 2005 [1], is often used as the wind turbine design guideline. In this standard, two turbulent wind models are recommended for wind turbine design: Kaimal Spectra and Exponential Coherence and Mann Spectral Tensor Model. The Kaimal Spectra and Exponential Coherence is referred to as the Kaimal model and the Mann Spectral Tensor Model is referred to as the Mann spectral model
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