Self-propelled particle transport in regular arrays of rigid asymmetric obstacles.
Self-propelled particle transport in regular arrays of rigid asymmetric obstacles.
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DOI：
10.1103/physreve.90.012307
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发表时间：
2014-07
期刊：
影响因子：
--
通讯作者：
F. Potiguar;G. A. Farias;W. P. Ferreira
中科院分区：
文献类型：
--
作者：
F. Potiguar;G. A. Farias;W. P. Ferreira
我们报告的数值结果表明，实现净运输的自推进粒子（SPPs）的存在下，一个二维的规则阵列的凸，对称或不对称，刚性障碍。排斥粒子间（软磁盘）和粒子障碍物的相互作用，目前没有对齐规则。我们发现，SPPs提出了一个涡型运动周围凸对称的障碍物，即使在没有水动力效应。这样的运动不是针对单个SPP观察到的，而是围绕障碍物的SPP的集体运动的结果。一个稳定的粒子流自发地建立在一个阵列的非对称凸障碍物（它没有空腔，其中粒子可能被困），并在没有一个外部场。我们的结果主要是自推进粒子附着在固体表面的倾向的结果。
We report numerical results which show the achievement of net transport of self-propelled particles (SPPs) in the presence of a two-dimensional regular array of convex, either symmetric or asymmetric, rigid obstacles. The repulsive interparticle (soft disks) and particle-obstacle interactions present no alignment rule. We find that SPPs present a vortex-type motion around convex symmetric obstacles even in the absence of hydrodynamic effects. Such a motion is not observed for a single SPP, but is a consequence of the collective motion of SPPs around the obstacles. A steady particle current is spontaneously established in an array of nonsymmetric convex obstacles (which presents no cavity in which particles may be trapped), and in the absence of an external field. Our results are mainly a consequence of the tendency of the self-propelled particles to attach to solid surfaces.