旋转圆盘在有限Reynolds number上的PdR流体动力学序
Purely hydrodynamic ordering of rotating disks at a finite Reynolds number
摘要：
流体动力学环境中运动物体的自组织现象近年来在自然现象和生命系统中引起了广泛的关注。然而，与热系统的自组织相比，由于其固有的非平衡性质，其潜在的物理机制还不太清楚。流体动力学相互作用被认为在这种现象中起着至关重要的作用。为了阐明有限雷诺数下多体流体动力学相互作用的基本物理性质，本文研究了零温度下二维粘性流体中的同向旋转硬盘系统。尽管没有热噪声，该系统表现出丰富的相行为，包括流体状态与扩散动力学，集团状态，六角状态，玻璃态，塑性晶体状态和相demixed.We揭示，这些行为引起的离轴和多体性质的非线性流体动力学相互作用和传播的动量扩散所需的有限时间。
英文摘要：
Self-organization of moving objects in hydrodynamic environments has recently attracted considerable attention in connection to natural phenomena and living systems. However, the underlying physical mechanism is much less clear due to the intrinsically nonequilibrium nature, compared with self-organization of thermal systems. Hydrodynamic interactions are believed to play a crucial role in such phenomena. To elucidate the fundamental physical nature of many-body hydrodynamic interactions at a finite Reynolds number, here we study a system of co-rotating hard disks in a two-dimensional viscous fluid at zero temperature. Despite the absence of thermal noise, this system exhibits rich phase behaviours, including a fluid state with diffusive dynamics, a cluster state, a hexatic state, a glassy state, a plastic crystal state and phase demixing.We reveal that these behaviours are induced by the off-axis and many-body nature of nonlinear hydrodynamic interactions and the finite time required for propagating the interactions by momentum diffusion.
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