论文标题
靠近软渗透界面附近的微晶状体的动力学
Dynamics of microswimmers near a soft penetrable interface
论文作者
论文摘要
几乎没有可变形界面附近的微武器的模拟。在这里，我们介绍了与嵌入二元流体混合物中的单个微型温度相关的流体动力流的数值模拟。这两种流体被隔离，被我们假设在其平面地面中最初制备的可渗透且可变形的界面隔开。我们发现微型威廉可以穿透界面，平行于其移动或向后反弹。我们分析了轨迹如何取决于游泳器类型（推动器/拉杆）和相对于界面的发射角。我们的模拟是在具有周期性边界条件的系统中进行的，对应于无限的流体界面阵列。拉拔器到达稳态，在该状态下它可以平行于界面游泳，要么选择垂直方向，并通过界面反复穿透。相反，推动器遵循两个接口之间的弹跳轨迹。我们讨论了生物学的几个例子，其中游泳者穿透软界面。我们的工作可以看作是此类过程的高度简化模型。
Few simulations exist for microswimmers near deformable interfaces. Here, we present numerical simulations of the hydrodynamic flows associated with a single microswimmer embedded in a binary fluid mixture. The two fluids demix, separated by a penetrable and deformable interface that we assume to be initially prepared in its planar ground-state. We find that the microswimmer can either penetrate the interface, move parallel to it or bounce back off it. We analyze how the trajectory depends on the swimmer type (pusher/puller) and the angle of incidence with respect to the interface. Our simulations are performed in a system with periodic boundary conditions, corresponding to an infinite array of fluid interfaces. A puller reaches a steady state in which it either swims parallel to the interface or selects a perpendicular orientation, repeatedly penetrating through the interface. In contrast, a pusher follows a bouncing trajectory between two interfaces. We discuss several examples in biology in which swimmers penetrate soft interfaces. Our work can be seen as a highly simplified model of such processes.
