论文标题
入侵者在谷物中移动的协作行为
Collaborative behavior of intruders moving amid grains
论文作者
论文摘要
我们通过使用离散数值模拟研究了二维颗粒系统中入侵者组的运动。通过在较小的磁盘（晶粒）内移动的较大磁盘（入侵者）上施加恒定速度或推力力，我们获得了每个入侵者和谷物的瞬时位置和力的成分。我们发现（i）入侵者即使在彼此相对较大的距离时也合作； （ii）合作动力学是连接入侵者的接触链的结果，以及分别在前后的颗粒介质的压实和扩展，每个入侵者； （iii）协作行为取决于入侵者的初始布置； （iv）对于一些初始布置，最终达到了相同的空间配置。最后，我们显示了一组入侵者的最小阻力的最佳距离，这对于搅拌地面或其他颗粒表面的设备可能有用。
We investigate the motion of groups of intruders in a two-dimensional granular system by using discrete numerical simulations. By imposing either a constant velocity or a thrusting force on larger disks (intruders) that move within smaller ones (grains), we obtained instantaneous positions and components of forces for each intruder and grain. We found that (i) intruders cooperate even when at relatively large distances from each other; (ii) the cooperative dynamics is the result of contact chains linking the intruders as well as compaction and expansion of the granular medium in front and behind, respectively, each intruder; (iii) the collaborative behavior depends on the initial arrangement of intruders; and (iv) for some initial arrangements, the same spatial configuration is eventually reached. Finally, we show the existence of an optimal distance for minimum drag for a given set of intruders, which can prove useful for devices stirring the ground or other granular surfaces.
