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Swimming in granular media
Physical Review E
We study a simple model of periodic contraction and extension of large intruders in a granular bed to understand the mechanism for swimming in an otherwise solid media. Using an event-driven simulation, we find optimal conditions that idealized swimmers must use to critically fluidize a sand bed so that it is rigid enough to support a load when needed, but fluid enough to permit motion with minimal resistance. Swimmers - or other intruders - that agitate the bed too rapidly produce large voidsdoi:10.1103/physreve.80.020301 pmid:19792063 fatcat:blznlfph4fe7rjgtgay6g2oifq