CAD技术在地下水有限元前处理中的应用

THE APPLICATION OF AUTOCAD IN THE PREPROCESS OF UNDERGROUND WATER FEM

有限元法是地下水计算中最为常用的一种数值计算方法,然而其前处理部分在整个系统分析中比较繁杂,尽管已出现一些商业化软件,在一定程度上实现了有限元单元网格的自动化剖分,但它们在实际应用中往往加上过多的限制,生成的网格难以符合实际水文地质条件。通过分析绘图软件AutoCAD的DXF文件的结构,利用面向对象的可视化集成开发工具Delphi 7.0开发了与AutoCAD接口的地下水有限元前处理程序,实现了地下水有限元计算中的网格半自动剖分,能快速获取有限元分析中前处理阶段的大量数据,可反复修改及显示生成的剖分网格图形,保证了生成网格的质量,缩短了有限元分析的周期。

FEM （Finite Elementary Method） is a numeric calculation method used popularly in the computing of underground water. And the preprocessing of FEM is very complex in the system analysis. Although some commercial softwares achieve automatic net dividing to some extent, many limiting conditions are added on them beforehand in applications and the quality of net dividing can not measure up to the calculation demand of the FEM in underground water. By means of analyzing DXF file of AutoCAD and then developing a preprocessing program for underground water FEM modeling on the basis of Delphi 7.0, semi-automatic net dividing is realized in the computing of underground water FEM. This program can rapidly get a lot of data from processing and re-alter and display the net map, thus ensuring the divided net quality and decreasing the computing period of FEM.