论文标题
在受限域中微武器的耗散湍流
Flocking turbulence of microswimmers in confined domains
论文作者
论文摘要
我们通过二维密闭域中的直接数值模拟进行了广泛研究动作活动物质的碳碳纤维 - 摩托 - 旋转 - 霍恩贝格模型。通过探索模型参数的空间，我们研究了一种新的主动湍流状态的出现，该状态发生在路线相互作用和游泳者的自我强化时发生。这种植入湍流的制度的特征是人口很少，每个涡流都被一个连贯的植入运动岛所包围。羊群湍流的能量谱显示了一个幂律缩放的指数，该指数弱取决于模型参数。通过增加限制，我们观察到蜂群的湍流变得不稳定：在较长的瞬态（以幂律分布式过渡时间为特征）后，系统切换到单个巨型涡流的有序状态
We extensively study the Toner-Tu-Swift-Hohenberg model of motile active matter by means of direct numerical simulations in a two-dimensional confined domain. By exploring the space of parameters of the model we investigate the emergence of a new state of active turbulence which occurs when the aligning interactions and the self-propulsion of the swimmers are strong. This regime of flocking turbulence is characterized by a population of few strong vortices, each surrounded by an island of coherent flocking motion. The energy spectrum of flocking turbulence displays a power-law scaling with an exponent which depends weakly on the model parameters. By increasing the confinement we observe that flocking turbulence becomes unstable: after a long transient, characterized by power-law distributed transition times, the system switches to the ordered state of a single giant vortex
