Numerical Simulation of the Low Reynolds Number Turbulence Model

• Main Authors: Wei-Jen Yang, 楊偉仁
• Other Authors: Tsarng-Sheng Cheng
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/16296986806313243091

碩士 === 中華大學 === 機械與航太工程研究所 === 94 === The objective of the research is to numerically study the turbulent flow structures over a 3D backward facing step. The numerical methods used in the present study are the finite-volume based SIMPLE algorisms coupled with a new modified low Reynolds number k-e turbulence model. Four different turbulence models are examined in the present study. A new turbulence model is proposed through the modification of near wall damping function fm from the existing models. Computed results indicate that the flow over a 3D backward facing step with an expansion ratio of 1.3 and an aspect ratio of 4 is asymmetric and three-dimensional. The dimensionality effect on the flow field is elucidated in the present study.