3D vector finite-element electromagnetic forward modeling for large loop sources using a total-field algorithm and unstructured tetrahedral grids
3D vector finite-element electromagnetic forward modeling for large loop sources using a total-field algorithm and unstructured tetrahedral grids
复制标题
使用全场算法和非结构化四面体网格对大型环路源进行 3D 矢量有限元电磁正演建模
DOI：
10.1190/geo2016-0004.1
复制
发表时间：
2017
期刊：
影响因子：
3.3
通讯作者：
Xiangyun Hu
中科院分区：
文献类型：
--
作者：
Jianhui Li;Colin G. Farquharson;Xiangyun Hu
摘要局部加密的非结构四面体网格有利于总场解方法在地球物理电磁场正演问题中的应用。这些方法，当结合矢量有限元（FE）方法和细化附近的发射机和接收机，可以给出准确的解决方案，可以很容易地处理复杂的几何形状和地形的现实模型。我们已经将这种方法应用于固定和移动环路配置的三维正演模拟。MUMPS是一个直接求解器，用于求解有限元分析产生的线性方程组。直接求解器特别适合于移动环路配置，对于该移动环路配置，每个发射器环路的右侧不同，但是系数矩阵不变。因此，系数矩阵只需要被分解一次，然后系统可以有效地解决所有不同的右侧。我们比较了我们的结果与几个典型的情况下，从文献中：导电砖…
ABSTRACTUnstructured tetrahedral grids with local refinement facilitate the use of total-field solution approaches to geophysical electromagnetic (EM) forward problems. These approaches, when combined with the vector finite-element (FE) method and with refinement near transmitters and receivers, can give accurate solutions and can easily handle realistic models with complex geometry and topography. We have applied this approach to 3D forward modeling for fixed- and moving-loop configurations. MUMPS, a direct solver, was used to solve the linear system of equations generated by FE analysis. A direct solver is particularly suited to the moving-loop configuration for which the right side is different for every transmitter loop, but for which the coefficient matrix is unchanged. Therefore, the coefficient matrix need only be factorized once, and then the system can be solved efficiently for all different right sides. We compared our results with several typical scenarios from the literature: a conductive bric...