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We propose a cruiser able to move in a granular medium made of nearly 50-50bidisperse dissipative particles under gravity. The cruiser has a circularshape with a square indentation on its edge. By shifting and then ejectinggranular particles entering its indent-region facing a given direction, thecruiser gains thrust to push itself forward in the same direction, which can beeither perpendicular or parallel to gravity. Using molecular dynamics (MD)simulations, we identify three universal phases during one particle-ejectionprocess: 1) acceleration by the ejection thrust, 2) deceleration by thecompressed particles ahead and 3) relaxation with the decompressed particles.We also confirm that the cruising capability improves with increasing theparticle-ejection strength and with decreasing the interference from gravity.

Studying the Kinetics of a Self-propelled Cruiser in 2D Granular Media under Gravity