Statistical Physics

Granular drag on a discrete object: shape effects on jamming

We study the drag force on discrete objects with circular cross section moving slowly through a spherical granular medium. Variations in the geometry of the dragged object change the drag force only by a small fraction relative to shape effects in fluid drag. The drag force depends quadratically on the object’s diameter as expected. We do observe, however, a deviation above the expected linear depth dependence, and the magnitude of the deviation is apparently controlled by geometrical factors.


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Physical Review E 70, 046115 (2004)

A.-L. Barabási, V. W. Freeh, H. Jeong, J. Brockman

Nature 412, 894-897 (2001)

B. Kahng, I. Albert, P. Schiffer, A.-L. Barabási

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