From disks to channels: dynamics of active nematics confined to an annulus
From disks to channels: dynamics of active nematics confined to an annulus
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从圆盘到通道：局限于环面的活性向列动力学
DOI：
10.1039/d3sm00477e
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发表时间：
2023
期刊：
影响因子：
3.4
通讯作者：
Hagan, Michael F.
中科院分区：
文献类型：
--
作者：
Joshi, Chaitanya;Zarei, Zahra;Norton, Michael M.;Fraden, Seth;Baskaran, Aparna;Hagan, Michael F.
约束可以用来系统地控制发生在活动流体中的湍流动力学。虽然周期通道是研究约束最简单的几何形状，但相应的实验实现需要封闭的赛道。在这里，我们计算地研究了这种几何环空的二维主动向列。通过系统地改变环空内半径和通道宽度，我们桥接了在先前研究的环空几何的渐近极限中观察到的行为：一个圆盘和一个无限通道。我们发现了新的稳态行为，揭示了边界曲率的影响及其与约束的相互作用。我们还表明，在阈值内半径以下，动力学对内孔的存在不敏感。我们通过一个简单的尺度分析来解释这种不敏感性。我们的工作进一步阐明了使用约束来控制主动向列方程组动力学的设计原则。
Confinement can be used to systematically tame turbulent dynamics occurring in active fluids. Although periodic channels are the simplest geometries to study confinement numerically, the corresponding experimental realizations require closed racetracks. Here, we computationally study 2D active nematics confined to such a geometry—an annulus. By systematically varying the annulus inner radius and channel width, we bridge the behaviors observed in the previously studied asymptotic limits of the annulus geometry: a disk and an infinite channel. We identify new steady-state behaviors, which reveal the influence of boundary curvature and its interplay with confinement. We also show that, below a threshold inner radius, the dynamics are insensitive to the presence of the inner hole. We explain this insensitivity through a simple scaling analysis. Our work sheds further light on design principles for using confinement to control the dynamics of active nematics.