Rod-shaped active micro/nano-particles, such as bacterial and bipolar metallic micro/ nano-motors, exhibit emergent collective phenomena far from equilibrium state compared to passive particles. We apply a simulation approach —dissipative particle dynamics (DPD)— to explore the collectively ordered states of self-propelled rods (SPRs) which rely on the defect dynamics in the rod cluster. The SPRs are confined in a doublet of circular confinement and repel each other when two rods touch each other. When the rod flow in the connecting passage of the circles is suppressed, namely the small passage width, the steady vortex pattern is obtained in the two circles for weak activity. In binary-passage system, long single-passage system, and short single-passage system, ferromagnetic vortices (FMV), uncorrelated vortices (UV), and anti-ferromagnetic vortices (AFMV) can be obtained, respectively. For intermediate activity, a regular periodic oscillation of the rod number n _r in one circle can be seen clearly. For strong activity, mixing of high- and low-frequency oscillation is observed. The amplitude of the rod current in the passage I _p follows the relation , where F _a denotes the self-propelled force.

棒状的活性微米/纳米颗粒，例如细菌和双极金属微米/纳米电动机，与被动颗粒相比，表现出远离平衡状态的新兴集体现象。我们应用了一种模拟方法-耗散粒子动力学（DPD）-探索了依靠杆簇中缺陷动力学的自推进杆（SPR）的集体有序状态。SPR被限制在圆形限制的双峰中，并且当两个杆彼此接触时彼此排斥。当杆在圆的连接通道中的流动被抑制时，即通道宽度较小时，由于活动性较弱，在两个圆中获得了稳定的涡流模式。在二元通道系统，长单通道系统和短单通道系统中，铁磁涡旋（FMV），不相关涡旋（UV），可以分别获得反铁磁涡旋和反铁磁涡旋（AFMV）。对于中间活动，杆号有规律的周期性振荡 可以清楚地看到n _r一圈。对于强活动，可以观察到高频和低频振荡的混合。通道I _p中的杆电流的幅度遵循以下关系式，其中F _a表示自推力。