论文标题
磁盘流过周期性和稀释的障碍物阵列的方向堵塞和相位分离
Directional Clogging and Phase Separation for Disk Flow Through Periodic and Diluted Obstacle Arrays
论文作者
论文摘要
我们将集体磁盘的流动模拟障碍物的平方阵列，因为流动方向相对于阵列的对称方向而变化。在较低的磁盘密度下，任何驱动方向都没有堵塞，但是随着磁盘密度的增加，平均磁盘速度会降低并产生驱动角依赖性。对于某些驾驶角度，当系统形成由高密度堵塞的区域组成的异质堵塞状态时，流量会降低或降至零。堵塞的状态是脆弱的，可以通过更改驱动角来解开。对于大型障碍物，我们发现一个统一的堵塞状态与集体堵塞机构不同。在堵塞的相位中，可以随着驱动力的增加而发生渗透过渡，并且强烈间歇性运动出现在滴定阈值上方。堵塞对于障碍物的随机去除或稀释是可靠的，即使在日益稀释的情况下，磁盘也能够形成跨系统堵塞的簇。但是，如果稀释变得太大，则堵塞行为会丢失。
We model collective disk flow though a square array of obstacles as the flow direction is changed relative to the symmetry directions of the array. At lower disk densities there is no clogging for any driving direction, but as the disk density increases, the average disk velocity decreases and develops a drive angle dependence. For certain driving angles, the flow is reduced or drops to zero when the system forms a heterogeneous clogged state consisting of high density clogged regions coexisting with empty regions. The clogged states are fragile and can be unclogged by changing the driving angle. For large obstacle sizes, we find a uniform clogged state that is distinct from the collective clogging regime. Within the clogged phases, depinning transitions can occur as a function of increasing driving force, with strongly intermittent motion appearing just above the depinning threshold. The clogging is robust against the random removal or dilution of the obstacle sites, and the disks are able to form system-spanning clogged clusters even under increasing dilution. If the dilution becomes too large, however, the clogging behavior is lost.
