| 摘要: |
| 针对频率域2.5维电磁测深问题,借鉴地震波模拟中吸收边界的处理方法,将波数域电磁场方程分解成两个传 播方向相反的单程波方程，以沿边界外法向衰减的单程波方程作为该边界上的吸收边界条件。给出了全吸收边界 条件的构造方法,并导出了 15°吸收边界的具体形式。数值计算结果表明,该吸收边界条件使边界反射得到了有效 压制，在相同的计算量下计算精度显著提高。' |
| 关键词: 吸收边界条件 2.5维 电磁测深 有限元方法 |
| DOI： |
| 分类号: |
| 基金项目: |
|
| Absorbing boundary condition for simulating 2.5-D electromagnetic sounding in frequency domain by finite element method |
|
XUE Dong-chuan, DAI Shi-kun
|
|
(Key Laboratory of Geophysical Exploration of China National Petroleun China University of Petroleum, Beijing 102249, China)
|
| Abstract: |
| Referring to the method of constructing absorbing boundary condition in seismic wave modeling, absorbing boundary condition for simulating 2. 5-D electromagnetic sounding in frequency domain was studied by finite element method. Electromagnetic equation was decomposed into two reverse direction one-way wave equations in wavenumber domain. Then, the one-way equation, which decayed along the outer normal direction was treated as the absorf>ing boundary condition of that boundary. The method how to construct full absorbing boundary condition was given, and 15° absorbing boundary condition was formulated. Numerical results indicate that this boundary condition effectively suppresses reflection and improves solution accuracy rernarfcably. |
| Key words: absorbing boundary condition 2.5-D electromagnetic sounding finite element method |
