PDF(Pubmed)
Abstract：
Active fluids composed of constituents that are constantly driven away from thermal equilibrium can support spontaneous currents and can be engineered to have unconventional transport properties. Here, we report the emergence of (meta)stable traveling bands in computer simulations of aligning circle swimmers. These bands are different from polar flocks and, through coupling phase with mass transport, induce a bulk particle current with a component perpendicular to the propagation direction, thus giving rise to a collective Hall (or Magnus) effect. Traveling bands require sufficiently small orbits and undergo a discontinuous transition into a synchronized state with transient polar clusters for large orbital radii. Within a minimal hydrodynamic theory, we show that the bands can be understood as nondispersive soliton solutions fully accounting for the numerically observed properties.
摘要：
由不断远离热平衡的成分组成的活性流体可以支持自发流，并且可以被设计为具有非常规的传输特性。这里,我们报告了在对齐圆圈游泳者的计算机模拟中出现（元）稳定的游带。这些波段不同于极群，通过耦合阶段与质量传输，诱导具有垂直于传播方向的分量的块状颗粒电流，从而产生集体霍尔(或马格努斯)效应。行进带需要足够小的轨道，并且对于较大的轨道半径，会经历不连续过渡到具有瞬态极簇的同步状态。在最小流体动力学理论中，我们表明，这些带可以理解为非色散孤子解，充分说明了数值观察到的性质。
