Molecular Dynamics Simulation Study on Nanoscale Flow Interference Between Two Circular Cylinders

李印实; 何雅玲; 孙杰; 陶文铨

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Molecular Dynamics Simulation Study on Nanoscale Flow Interference Between Two Circular Cylinders

更新时间：2025-12-08

- Molecular Dynamics Simulation Study on Nanoscale Flow Interference Between Two Circular Cylinders
- Vol. 41, Issue 7, Pages: 788-791(2007)
- 作者机构：
  
  西安交通大学动力工程学院动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK124
- Online First：10 July 2007，
  
  Published：2007
- 稿件说明：
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李印实, 何雅玲, 孙杰, et al. Molecular Dynamics Simulation Study on Nanoscale Flow Interference Between Two Circular Cylinders[J]. 2007, 41(7): 788-791.
DOI：

李印实, 何雅玲, 孙杰, et al. Molecular Dynamics Simulation Study on Nanoscale Flow Interference Between Two Circular Cylinders[J]. 2007, 41(7): 788-791. DOI：

摘要

采用分子动力学模拟方法

对纳米尺度下的等大并列双圆柱绕流问题进行了数值研究.模拟结果表明:在低雷诺数(Re=22)、纳米尺度下

同样存在由于L

为两圆柱轴线之间的距离

为圆柱的直径)值的变化

导致流场内呈现出单涡脱落、双稳态以及双涡对称同步脱落的不同流动状态

这与宏观尺度下的研究结论相一致.然而

各种流动状态所对应的L

范围却与宏观尺度下的数值和实验研究结果不一致.单涡脱落区域为L

1.1

双稳态现象出现的区域为1.1

1.8

且由于间隙流的影响

当L

=1.2时

就已出现了典型的双稳态现象

双涡对称同步脱落区域为L

>1.8.微观尺度下的3种不同特性的流动状态均比宏观研究结果提前

表明流动状态的变化具有明显的尺度特征.

Abstract

The nanoscale phenomenon of two identical circular cylinders arranged in a side-by-side configuration in steady cross-flow was investigated using molecular dynamics simulations with the Lennard-Jones potential model at a low Reynolds number(Re=22). L

the centre-to-centre pitch ratio

ranged from 1.0 to 2.0. Three basic flow patterns were observed and the results indicate that the characteristic ranges of the microscopic flow patterns are different from those of the macroscopic phenomenon. Single bluff-body vortex shedding range is L

1.1. Biased flow with synchronized vortex shedding range is 1.1

1.8 with the emergence of the typical biased flow at L

=1.2 because of the presence of gap flow.Symmetric flow with synchronized vortex shedding range is L

>1.8.All the boundaries of the L

ranges corresponding to the three types of flow patterns in nanoscale are smaller than those in macroscopic phenomenon

which indicates significant scale effect.

关键词

Keywords

references

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