We investigate numerically (DEM simulations) how a set of intruders interact with each other while moving horizontally in a two-dimensional bounded granular system. We observed that there is a cooperative dynamics at play, resulting from the compaction and expansion of the granular medium in front and behind, respectively, of each intruder, with contact networks linking them. We also observed that different patterns (migration types) appear depending on the initial dispositions of intruders. For some ranges of initial conditions, the same final distance between intruders is reached at the end of their motion, showing an attractor-like behavior. Our results provide new insights into the cooperative dynamics of intruders moving through a granular system.
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