摘要
从数值波在每一时间步长内传播的距离不超过Courant数个网格点的基础出发 ,采用时间滞后条件 ,构造了虚拟的重叠计算水域 .利用重叠 -投影法 ,在连接 (点 )处建立一、二维耦合模型 ,实现了由一维计算水域向二维计算水域的准确过渡 .采用一、二维耦合模型和全一维模型对上海市淀南片河网的验证计算表明 ,一、二维耦合模型能较好地模拟非恒定水流 。
Based on the fact that the information propagation distance in one time step can not be greater than the length of N (Courant number) grids, a new approach, namely overlapping projecting method, is proposed using the time delayed boundary condition. According to the method, a coupling model is developed to join the calculation domains of 1 D and 2 D numerical models. Comparison of the calculation results of the coupling model with those of 1 D model shows that the coupling model can simulate unsteady flow with tributaries and is stable, reliable and practical.
出处
《水利水运工程学报》
CSCD
北大核心
2002年第2期48-51,共4页
Hydro-Science and Engineering
关键词
重叠-投影法
耦合模型
数值计算
非恒定水流
unsteady flow
overlapping projecting method
coupling model
numerical calculation
