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In the corresponding fluid dynamics video, created for the APS DFD 2012Gallery of Fluid Motion, we show high-speed videos of 2D granular impactexperiments, where an intruder strikes a collection of bidisperse photoelasticdisks from above. We discuss the force beneath the intruder, which is stronglyfluctuating in space and time. These fluctuations correspond to acoustic pulseswhich propagate into the medium. Analysis shows that this process, in ourexperiments, is dominated by collisions with grain clusters. The energy fromthese collisions is carried into the granular medium along networks of grains,where is it dissipated.

Granular Impact Dynamics: Acoustics and Fluctuations