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The fluid dynamics video considers an array of two NREL 5-MW turbinesseparated by seven rotor diameters in a neutral atmospheric boundary layer(ABL). The neutral atmospheric boundary-layer flow data were obtained from aprecursor ABL simulation using a Large-Eddy Simulation (LES) framework withinOpenFOAM. The mean wind speed at hub height is 8m/s, and the surface roughnessis 0.2m. The actuator line method (ALM) is used to model the wind turbineblades by means of body forces added to the momentum equation. The fluiddynamics video shows the root and tip vortices emanating from the blades fromvarious viewpoints. The vortices become unstable and break down intolarge-scale turbulent structures. As the wakes of the wind turbines advectfurther downstream, smaller-scale turbulence is generated. It is apparent thatvortices generated by the blades of the downstream wind turbine break downfaster due to increased turbulence levels generated by the wake of the upstreamwind turbine.

Wake Turbulence of Two NREL 5-MW Wind Turbines Immersed in a Neutral Atmospheric Boundary-Layer Flow