壁面展向振动流体特性的分子动力学

系统仿真学报 ›› 2015, Vol. 27 ›› Issue (9): 1927-1934.

• 建模与仿真理论及方法 • 下一篇

壁面展向振动流体特性的分子动力学

董海军, 卢晓青, 张浩鹏, 单明明

西北工业大学机电学院,西安 710072

收稿日期:2015-04-30 修回日期:2015-06-15 出版日期:2015-09-08 发布日期:2020-08-07

Molecular Dynamics of Fluid Properties by Spanwise Oscillations of Solid Wall

Dong Haijun, Lu Xiaoqing, Zhang Haopeng, Shan Mingming

School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China

Received:2015-04-30 Revised:2015-06-15 Online:2015-09-08 Published:2020-08-07
About author:Dong Haijun(1960-), male, Shanxi, Associate Professor. Research field Nonlinear dynamics in mechanical system, mechanical design, etc; Lu Xiaoqing(1990-), female, Shanxi, degree of master.
Supported by:
Natural Science Foundation of China (51275412)

摘要/Abstract

摘要： 应用分子动力学方法研究壁面展向振动条件下流体的流动特性。构建了由铜固体壁面与氩流体构成的三维Couette流动几何模型。通过对固体平板壁面施加不同振动参数的展向振动,模拟仿真了不同振动参数下近壁面流体的流动状态,得到了相应的流体流动参数,进而研究分析了壁面振动对固液界面间摩擦阻力的影响机制。研究结果表明:对壁面施加展向振动可以有效地减小固液界面间的摩擦力,减阻的幅度与振动参数关系很大;通过对流体的速度场及密度分布的分析,认为固体壁面展向振动使近壁面流体密度大幅度降低是导致固液界面间摩擦力减小的主要原因。

关键词: 壁面振动, 减阻, 流场, 分子动力学模拟

Abstract: The fluid properties under the condition of the solid wall spanwise oscillation were studied using the molecular dynamics method. The three dimensional Couette flow model which was made up of copper wall and argon fluid was built. The fluid state of the near wall was simulated under the different oscillation parameters of solid wall and the corresponding fluid velocity field, the density distribution, the potential energy curves and the friction force were obtained. Then the influence mechanism of the wall oscillations on the frictional drag at liquid-solid interface was investigated. The results indicate that the frictional drag between wall and fluid can be reduced effectively by applying spanwise oscillation for the solid wall and the drag reduction rate is mainly dependent on the oscillation parameters. Meanwhile, the decrease of fluid density near wall leads to the reduction in frictional drag at liquid-solid interface.

Key words: wall oscillations, drag reduction, flow field, molecular dynamics simulation

中图分类号:

O353.1

董海军, 卢晓青, 张浩鹏, 单明明. 壁面展向振动流体特性的分子动力学[J]. 系统仿真学报, 2015, 27(9): 1927-1934.

Dong Haijun, Lu Xiaoqing, Zhang Haopeng, Shan Mingming. Molecular Dynamics of Fluid Properties by Spanwise Oscillations of Solid Wall[J]. Journal of System Simulation, 2015, 27(9): 1927-1934.

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壁面展向振动流体特性的分子动力学

Molecular Dynamics of Fluid Properties by Spanwise Oscillations of Solid Wall

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