组合网格法在无压稳定渗流中的应用  

Application of composite grid method in unconfined seepage analysis

作　　者：张顺福[1,2] 丁留谦[1,2] 

机构地区：[1]中国水利水电科学研究院防汛抗旱减灾研究所,北京100038 [2]水利部防洪抗旱减灾中心,北京100038

出　　处：《中国水利水电科学研究院学报》2016年第1期16-22,共7页Journal of China Institute of Water Resources and Hydropower Research

基　　金：中国科技部国际合作项目(2010DFA74520)

摘　　要：针对无压稳定渗流分析过程中常遇到的线形结构问题,提出将组合网格法应用于无压稳定渗流计算。采用两套独立的网格,对整体区域采用尺寸较大的粗网格进行模拟,不考虑线形结构的影响,在线形结构附近则采用尺寸比较小的细网格进行模拟,考虑线形结构的影响。计算在粗细两套网格之间迭代调整,直到达到收敛精度。组合网格法大大简化离散工作量,且适应于非规则网格。数值计算结果表明,组合网格法合理可行,计算程序可靠,这为线形结构的无压稳定渗流分析提供了一种思路和方法。To solve the＂line-style structure＂problem often encountered in unconfined steady seepage analy-sis,Composite Grid Method is adopted. Two sets of independent grids are used in numerical simulation.One is the coarse grid of larger size simulating the entire region without consideration of＂line-style struc-ture＂and the other is the fine grid of relatively small size simulating the domain including the＂line-stylestructure＂. Adjustments are carried out iteratively between the coarse grid and fine grid until desired conver-gence precision is achieved. With Composite Grid Method,the amount of discretization is greatly reduced.The Composite Grid Method can be adapted to non-regular grid. Numerical simulation result shows that thetheory is reasonable and the program is reliable. Composite Grid Method provides an approach to solvingthe＂line-style structure＂problem in unconfined steady seepage analysis.

关 键 词：无压稳定渗流 组合网格 线形结构 改进初流量法 有限单元法 

分 类 号：TV139.14[水利工程—水力学及河流动力学]