论文标题
活性新闻的介观模拟
Mesoscopic Simulations of Active-Nematics
论文作者
论文摘要
粗粒细粒度的中尺度模拟对于研究软凝结物质而言是无价的，因为它们具有模拟背景溶剂起着重要作用但不是主要利益的系统的能力。这样的方法通常对被动溶剂进行建模；但是，远程平衡系统也可能由悬浮在活性流体中的复杂溶质组成。然而，很少有粗粒仿真方法可以建模活性介质。我们引入了一种算法来模拟主动命名，该算法以多粒子碰撞动力学（MPCD）为基础，用于通过在局部碰撞算子中引入偶极活性来进行被动波动。现有nematic MPCD（ANMPCD）模拟表现出主动列湍流的关键特征，但作为基于粒子的算法，也繁殖了活性粒子模型的关键属性。因此，介观AN-MPCD是一种桥接显微镜和连续描述的方法，可以对复合活性 - 假系统进行新的模拟。
Coarse-grained, mesoscale simulations are invaluable for studying soft condensed matter because of their ability to model systems in which a background solvent plays a significant role but is not the primary interest. Such methods generally model passive solvents; however, far-from-equilibrium systems may also be composed of complex solutes suspended in an active fluid. Yet, few coarse-grained simulation methods exist to model an active medium. We introduce an algorithm to simulate active nematics, which builds on multi-particle collision dynamics (MPCD) for passive fluctuating nematohydrodynamics by introducing dipolar activity in the local collision operator. Active-nematic MPCD (AN-MPCD) simulations exhibit the key characteristics of active nematic turbulence but, as a particle-based algorithm, also reproduce crucial attributes of active particle models. Thus, mesoscopic AN-MPCD is an approach that bridges microscopic and continuum descriptions, allowing novel simulations of composite active-passive systems.
