Hydrodynamic interaction of microswimmers near a wall.
Hydrodynamic interaction of microswimmers near a wall.
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DOI：
10.1103/physreve.90.013010
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发表时间：
2014-07
期刊：
影响因子：
--
通讯作者：
Ardekani AM
中科院分区：
文献类型：
--
作者：
Li GJ;Ardekani AM
本文对一个典型的低雷诺数游动体（称为“蠕动体”）在近壁处的流体动力学特性进行了数值研究。对于单个蠕动体，根据游动机制，区分三种不同的模式：（a）蠕动体从壁面逃逸，（B）蠕动体以恒定的距离和定向角沿壁面沿着游动，以及（c）蠕动体以周期性轨迹在壁面附近游动。惯性效应对蠕动器近壁运动的作用被量化。在两个墙壁之间游泳的多个蠕动的动力学被发现是非常不同的从一个单一的蠕动。观察到蠕动体的近壁积累。在相对较小的浓度c = 0.1时，约60 - 80%的蠕动体聚集在壁附近，并且推和拉的朝向壁的吸引力比中性蠕动体更强。近壁蠕动器的方向垂直于壁，而在体区域中，蠕动器的方向大多平行于壁。在高浓度下，c = 0.4，近壁蠕动的百分比约为40%。在高浓度下，体相区蠕动体的取向角分布更均匀。在近壁区，拉子相互排斥，而推子相互吸引并形成簇。
The hydrodynamics of an archetypal low-Reynolds number swimmer, called “squirmer”, near a wall has been numerically studied. For a single squirmer, depending on the swimming mechanism, three different modes are distinguished: (a) the squirmer escaping from the wall, (b) the squirmer swimming along the wall at a constant distance and orientation angle, and (c) the squirmer swimming near the wall in a periodic trajectory. The role of inertial effects on the near-wall motion of the squirmer is quantified. The dynamics of multiple squirmers swimming between two walls is found to be very different from a single squirmer. Near-wall accumulation of squirmers are observed. At a relatively small concentration c = 0.1, around 60 – 80% of the squirmers are accumulated near the walls and attraction of pushers and pullers towards the wall is stronger than neutral squirmers. Near-wall squirmers orient normal to the wall, while in the bulk region, the squirmers are mostly oriented parallel to the wall. At a high concentration, c = 0.4, the percentage of the near-wall squirmers is around 40%. The orientation angle of squirmers in the bulk region is more uniformly distributed at high concentrations. In the near-wall region, pullers repel each other, while pushers are attracted to each other and form clusters.