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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G. Palla, I. Farkas, I. Derenyi, A.-L. Barabási, T. Vicsek

Physical Review E 70, 046115 (2004)

I. Albert, P. Tegzes, R. Albert, J. G. Sample, A.-L. Barabási, T. Vicsek, B. Kahng, P. Schiffer

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E. Almaas, B. Kovacs, T. Vicsek, Z.N. Oltvai, A.-L. Barabási

Nature 427, 839-843 (2004)