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Research on Application of Lagrangian Direct Numerical Simulation to the Unsteady Incomprssible Viscous Flow with Moving boundary.

拉格朗日直接数值模拟在动边界非定常不可压缩粘性流中的应用研究。

基本信息

批准号：
07455083
负责人：
KAMEMOTO Kyoji
金额：
$ 4.48万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

In this research, the advanced vortex method was extended to the analysis of unsteady incompressible viscous flow around oscilating or moving boundaries by introducing the moving boundary condition. The validity of the calculation technique presented here was examined by the simulation of flow around a forced oscillating circular cylinder. The calculation results, such as unsteady fluid force acting on the cylinder and typical flow patterns, vortex structures in the wake and lock-in phenomena were in good agreement with those of experiments. The simulation technique was also applied to the analysis of flow around an freely oscillating circular cylinder, an oscillating airfoil, and unsteady characteristics of flows through a centrifugal-pump impeller. It is confirmed that the advanced vortex method with moving boundary condition is one of the efficient tool of the research on flow around moving boundary and flow induced vbration problems.The flow around a forced oscillating circular cylinder was investigated experimentally in a water tank. The typical flow patterns, vortex structures were visualized and unsteady fluid forces were measured.

本文通过引入动边界条件，将先进涡方法推广到非定常不可压粘性绕振荡或动边界流动的分析。通过对受迫振荡圆柱绕流的数值模拟，验证了本文提出的计算方法的有效性。计算结果表明，圆柱体所受的非定常流体力、典型流态、尾迹涡结构和锁止现象等与实验结果吻合较好。模拟技术也被应用于分析绕自由振荡圆柱的流动，振荡翼型，和通过离心泵叶轮的流动的非定常特性。本文通过对水槽中圆柱受迫振动问题的实验研究，证实了动边界条件下的先进涡方法是研究动边界绕流和流致振动问题的有效工具之一。对典型的流态、涡结构进行了可视化显示，并测量了非定常流体力。