Polymer对卡门涡影响的分子动力学研究
Polymer effects on Karman Vortex: Molecular Dynamics Study
摘要：
采用分子动力学模拟方法研究了圆柱体后的卡门涡在聚合物溶液中的运动。短链和长链聚合物的涡旋特性明显不同。具有长链聚合物的溶液表现出涡旋脱落频率的降低和升力系数谱的加宽。另一方面，短链聚合物溶液的特性几乎与牛顿流体相同。这些事实与实验相一致。由于长链聚合物溶液的旋转半径和取向顺序在流场中的分布是高度不均匀的，我们可以得出结论，聚合物的拉伸性能在改变流动特性中起着重要的作用。
英文摘要：
We investigated the Karman vortex behind a circular cylinder in a polymer solution by a molecular dynamics simulation. The vortex characteristics are distinctly different for short and long polymers. The solution with the long polymer exhibits a reduction in the vortex shedding frequency and broadening of the lift coefficient spectrum. On the other hand, the characteristics of the short-polymer solution are almost same as those of the Newtonian fluid. These facts are consistent with the experiments. Because the distributions of the gyration radius and the orientational order of the long-polymer solution are highly inhomogeneous in the flow field, we conclude that the extensional property of the polymer plays an important role in changing the flow characteristics.
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