The wind farm is a vortex generator.
Letting DDG ponder the question, we find this:
www.wind-watch.org: Effect of unsteady flow on wind turbine wake development and noise generation
Quote:
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Results also showed that the emitted noise is refracted due to the wind shear in atmospheric boundary layer, as well as the wake and associated turbulent structures. The [computational fluid dynamics] outcomes showed that the wake breakdown occurs at a distance of 12 diameters downstream of the turbine with a strong downwash due to longitudinal vortices. Contours of sound pressure level at the breakdown location of the wake of the wind turbine showed refraction and modulation of the sound at this location.
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Serendipitiously, one also finds
www.solidsmack.com: The Aeolus Wind Harp is Not Your Mother's Wind Harp. I always thought it a good idea to have an
aeolian harp in the top of a house, as a weather predictor, tuned to annunciate changes in the wind direction. Here's one you can walk inside.
