基于GID有限元前处理的波动方程数值模拟  

Numerical Simulation of Wave Equation Based on Finite Element Pre-processing in GID

作　　者：刘静 文山师 黄晶晶 

机构地区：[1]山西省煤炭地质115勘查院,山西大同037003 [2]中石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011 [3]中石化石油工程地球物理有限公司河南分公司,河南南阳473000

出　　处：《工程地球物理学报》2014年第2期243-249,共7页Chinese Journal of Engineering Geophysics

摘　　要：在地震波数值模拟计算过程中,缺乏简单易行的有限元前处理方法,使得复杂构造模型较难建立和分析。本文以二维声波方程为例结合GID软件,网格剖分部分采用三角形单元模拟速度界面,把单元内的场和波速均看作单元上的线性函数;GID软件可以方便地进行网格剖分和设置网格控制节点,通过编写用户自定义"问题类型",建立并输出已有的有限元计算程序的初始模型。将GID软件前处理与有限元计算程序整合,提高了方法的效率,简单易行。In the field of seismic wave numerical simulation, simple and feasible approaches for pre- processing are still lacking, which makes complex geological modeling difficult to build and analyze. Through an example of 2D wave equation based on GID, the division of meshing adopts triangular velocity interfaces. Both field and velocity are regarded as linear function in elements. GID can easily carry out meshing and set up grid control node. By writing the codes of ＇problem type＇, the initial model which can be used in the existing finite element calculation software is built and output. The integration of pre- processing in GID and finite element calculation soft makes the effectiveness of the method, which is simple and feasible.

关 键 词：数值模拟 有限元 GID 声波方程 三角形单元 

分 类 号：P631.4[天文地球—地质矿产勘探]