Abstract
In wind farm simulations, the inflow wind field plays a crucial role in the accuracy of both power production, structural load predictions and the turbulent wake development behind wind turbines. Three different inflow wind field generation techniques, namely the Mann model, a reduced order based model described herein and LES data, are used in this study to characterise the relation between the inflow and the structural response of the wind turbine. In addition, the wake development under different inflow conditions are studied. The turbulence statistics of the reduced-order model and the LES data are similar to each other while the Mann turbulence has different turbulence profiles and spectral characteristics. An in-house developed aeroelastic code, 3Dfloat, is used for structural response analysis. The differences between the inflow fields are mainly attributed to the turbulence intensity profiles, and differences in their spectral characteristics.
Highlights
The inflow wind field plays a crucial role in the accuracy of both power production, structural load predictions and the turbulent wake development behind wind turbines
In wind farm simulations, the inflow wind field plays a crucial role in the accuracy of both power production, structural load predictions and the turbulent wake development behind wind turbines [1, 2]
While the Mann turbulence is almost independent of elevation, the standard deviations of the two other inflow models decrease with elevation
Summary
The inflow wind field plays a crucial role in the accuracy of both power production, structural load predictions and the turbulent wake development behind wind turbines [1, 2]. Most engineering models are developed for efficiency and speed for streamlined design processes and operation They often lack a complete time and space variation of the turbulence, in particular the energy carrying large scale structures. At x/D = 2.5, different simulations yield typical near-wake profiles, with two peaks in the velocity deficit near the rotor blade tip (y/D = ±0.5 spanwise, and z/D = 0.21 and z/D = 1.21 vertically) At this downstream position the wake obtained from full LES has a noticeably lower deficit than the the DWM wakes, and it has a clear asymmetry, i.e. having a higher deficit above hub height and at the right half of the wake when looking downstream (y < 0).
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