三度空間平面自由剪切混合層之數值模擬

• Main Author: 張元鼎
• Other Authors: 蔡永培
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/76928020070016268436

碩士 === 中華大學 === 機械與航太工程研究所 === 88 === Abstract The physical properties of plane, free shear layer generated by coflowing of two flows with different velocity ratio and density ratio are numerically investigated. It is important in mixing processes which are encountered in many engineering applications. For comparision purposes, 2D and 3D Navier—Stokes equations in conservation law form are solved directly using the second—order MacCormack and modified Godunov methods alternately to cancel the numerical phase error. The characterics of vortex dynamics in the development of spatial free mixing layer can be analyzed. Temporal statistics about this turbulent flow field are calculated. The characteristic features of the free shear layer are observed in the numerical results. These features are consistent with the experimental findings which lend full confidence that the simulated results have been validated satisfactorily.