三维各向异性介质弹性波模拟的透射边界条件  

Transparent boundary for modeling of elastic waves in three-dimensional anisotropic media

作　　者：苑闻京 徐萍[2] 

机构地区：[1]海油能源发展北京分公司信息技术中心,北京100027 [2]中国海洋石油总公司中海石油研究中心,北京100027

出　　处：《地球物理学进展》2011年第3期1010-1014,共5页Progress in Geophysics

基　　金：国家973计划项目(2009CB219404);国家自然科学基金项目(40830422)联合资助

摘　　要：在弹性波数值模拟中,为了压制人工边界反射,需要使用边界条件.本文从三维各向异性介质中弹性波方程出发,在边界入射波为平面波的假设前提下,利用特征值分解以及坐标系旋转,导出人工边界处质点位移矢量计算公式,实现了在边界处为任意倾斜入射时的透射边界条件.并显示了边界条件的使用效果.To suppress the reflection from the artificial boundary in numerical modeling of elastic wares, a proper boundary is required. We attempt to solve this issue in the case of 3-D anisotropic media. We assume that the incident ware on the boundary is a plane wave, and use eigenvalue decomposition and coordinate rotation to derive the calculation formulas for displacement vectors at the artificial boundary, so that forming a transparent boundary for the case that the incident wave is at an arbitary angle. The application of this method shows that such a condition can suppress arell the interference of boundary reflection on the sigral. This method is easy in usuage, and will not increase much calculation.

关 键 词：弹性波模拟 透射边界条件 各向异性介质 

分 类 号：P631[天文地球—地质矿产勘探]