摘要
采用修正Ｋ—ε模型封闭Ｒｅｙｎｏｌｄｓ方程作为紊流控制方程，引入通度概念处理曲面不规则边界，用ＶＯＦ法追踪自由表面，对闸孔出流和溢流坝过坝水流及水跃等一类复杂流速场进行数值模拟。计算结果表明，所建数学模型能够较好地模拟此类水流现象。
To solve the problems with irregular boundaries and free surfaces in predicting anisotropic turbulent flow, a modified K—ε turbulence model is derived, and the governing equations of turbulent flow over irregular boundary are developed by analyzing the solid-liquid two-phase theoretical flow model. And furthermore a partial-cell parameter is introduced to treat irregular boundary, which allows curved boundaries and internal obstacles or islands. For free surfaces, a simple but powerful method is described, based on the concept of a fractional volume of fluid (VOF). This method is efficient to track complicated free surfaces. The program and the computer code established can simulate highly-turbulent flow well.
出处
《华北水利水电学院学报》
1998年第3期20-23,共4页
North China Institute of Water Conservancy and Hydroelectric Power
关键词
水跃
紊流
数值模拟
Jump Turbulence Numerical modelling
