低速移動物體的初步數值模擬

• Main Author: 白凱元
• Other Authors: 牛仰堯
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/00087227881338709607

碩士 === 中華大學 === 機械工程學系碩士班 === 97 === Abstract Under a generalized coordinate transformation with arbitrary grid velocity, the gas-kinetic BGK equation is reformulated in a moving frame of reference. Then, a unified conservative gas-kinetic scheme is eveloped. This study is learning Xu’s method in 2007 and testing the accuracy of the fluid problem in low Mach number. This extends the applicable regime of the gas-kinetic scheme to the flows with free surface or moving boundaries by using the moving grid method . In order to increase the robustness of the moving grid method, a adaptive grid technique is also implemented in this method to redistribute the mesh concentration to the rapid variational flow region and modify the distorted moving mesh. The three test cases in this study .The falling plates and free surface flow verify the accuracy and robustness of the unified moving grid gas-kinetic method.But it is a lot of differences to improve in the cavity flow.