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We investigate the dynamics of pendulum chains immersed in turbulent boundarylayers. We combine laboratory experiments and video analysis of the kineticfacade exhibits by the artist Ned Kahn, composed of large-scale clusters ofcentimeter-sized plates oscillating freely in the wind. At the laboratoryscale, we show that a one-dimensional pendulum chain immersed in a wind tunnelexhibits a wave dispersion relation derived from a Sine-Gordon equation. Underthe wind action, the dynamical response is either dominated by a resonancephenomenon, or a linear response to pressure fluctuations. From amateur videoanalysis on large-scale kinetic facades, we show that the plate oscillation isdriven by the same resonant response mechanisms and the apparent wavy patterncorresponds to the most energetic Fourier mode propagating at the advectionspeed of pressure fluctuations.

Large-Scale Turbulent Pressure Fluctuations Revealed by Ned Kahn's Artwork