Unstructured Grid Calculation Using Quadratic Eddy- Viscosity Models

• Main Authors: Ming-Jie Chang, 張明介
• Other Authors: Yeng-Yung Tsui
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/71308191259057317154

碩士 === 國立交通大學 === 機械工程系 === 89 === In this thesis, SIMPLE algorithm were applied to numerical simulation with Unstructured grid. Numerical simulations were applied to several turbulent flows, including:(1)Fully developed channel flow﹐(2)flow through a back-step, (3)flow through a expansion pipe with various expansion angle, using (I)standard linear k-εmodel(II)second order nonlinear models, Including Speziale’s model and Rubinstein’s model. The predicted mean and turbulent results were compared with experimental results. Predictions of mean velocity, shear stress, and turbulent kinetic energy by Linear model and Nonlinear models are comparable. Nonlinear models predict better results in turbulence intensity and reattachment length. Compared with experimental results, all model performing poorly in the separated regions.