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Wake behavior and control: comparison of LES simulations and wind tunnel measurements

Abstract. This paper applies a large-eddy actuator line approach to the simulation of
wind turbine wakes. In addition to normal operating conditions, a specific
focus of the paper is on wake manipulation, which is performed here by
derating, yaw misalignment and cyclic pitching of the blades. With the
purpose of clarifying the ability of LES methods to represent conditions that
are relevant for wind farm control, numerical simulations are compared to
experimental observations obtained in a boundary layer wind tunnel with
scaled wind turbine models. Results indicate a good overall matching of
simulations with experiments. Low-turbulence test cases appear to be more
challenging than moderate- and high-turbulence ones due to the need for
denser grids to limit numerical diffusion and accurately resolve tip-shed
vortices in the near-wake region.
