Abstract
The wake recovery behind the Horns Rev wind farm is analysed to investigate the applicability of Large Eddy Simulations (LES) in combination with an actuator disc method (ACD) for farm to farm interaction studies. Periodic boundary conditions on the lateral boundaries are used to model the wind farm (as infinitely wide), using only two columns of turbines. The meteorological conditions of the site are taken into account by introducing wind shear and pre-generated synthetic turbulence to the simulation domain using body forces. Simulations are carried out to study the power production and the velocity deficit in the farm wake. The results are compared to the actual power production as well as to wind measurements at 2 km and 6 km behind the wind farm. The simulated power production inside the farm shows an overall good correlation with the real production, but is slightly overpredicted in the most downstream rows. The simulations overpredict the wake recovery, namely the wind velocity, at long distances behind the farm. Further studies are needed before the presented method can be applied for the simulation of long distance wakes. Suggested parameters to be studied are the development of the turbulence downstream in the domain and the impact of the grid resolution.
Highlights
Behind every large offshore wind farm a long distance wake will be found
The main interest of this study is the simulation result of the wake recovery at long distances behind the wind farm, e.g. the wind speeds at the met towers’ positions to be able to validate the model prediction and the uncertainty of the results compared to the measured values
Large Eddy Simulations (LES) are done in EllipSys3D using the actuator disc approach to study the ability of the model to simulate the wake recovery in the long distance wake behind large offshore wind farms
Summary
Behind every large offshore wind farm a long distance wake will be found. As more offshore wind farms are built there will be more occasions when the wake from one wind farm will interact with other nearby wind farms. The data sets consist of 10 minute mean values from measurements performed before the second wind farm Horns Rev II was erected. The used grid depends on the distribution of the wind farm, turbine size, the needed resolution for the rotor disc and computational requirements.
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