Results of wake simulations at the Horns Rev I and Lillgrund wind farms using the modified Park model

This document reports on the results of the wake simulations performed at both the Horns Rev I and Lillgrund oshore wind farms using the modified Park model for the benchmark cases established under the project EERA-DTOC and the IEC Wind Task Wakebench. It also illustrates the comparison between model simulations and the data.

The latter were first independently analyzed by Kurt Hansen and kindly delivered to us after the results of the models' benchmarks were publicly released. For Horns Rev I, the simulations agree very well with the observations, particularly when the simulation results are post-processed to partly take into account the wind direction uncertainty and when the wake decay coefficient is estimated either as function of the roughness, height, and atmospheric stability or turbulence intensity.

For Lillgrund, the trends of the simulations and the observations are generally the same, although the agreement is not as good as for the Horns Rev I case. When taking into account direction uncertainty, an improvement is found as well as when using the wake decay coefficient parametrization.