Application of the complex frequency shifted perfectly matched layer absorbing boundary conditions in transient electromagnetic method modeling

作者：Li Zhan Hui^*; Huang Qing Hua

来源：Chinese Journal of Geophysics, 2014, 57(4): 1292-1299.

DOI：10.6038/cjg20140426

• Transient electromagnetic
• Three-dimensional forward modeling
• Finite difference time domain (FDTD)
• Absorbing boundary condition
• CFS-PML

Instead of the conventional Dirichlet boundary condition (DBC),the complex frequency shifted perfectly matched layer (CFS-PML) absorbing boundary condition was applied in transient electromagnetic (TEM) method modeling. A finite difference time domain (FDTD) method was used for space discretization and time stepping. We obtained the plane wave solutions inside the CFS-PML and pointed out the reason why the regular PML fails for TEM modeling. We also provided a criterion for the selection of the parameters of CFS-PML. These ideas were validated for both the whole space and the half space models. The results of a whole space model using CFS-PML showed excellent consistency with the analytical solutions, while those using DBC deviated more than one order of magnitude at the latest delay time. The results of a half space model also showed great superiority of CFS-PML compared to DBC. However, the lack of absorbing ability of CFS-PML in the air caused some errors which could increase with time slowly. Proper models should be designed according to the permitted error.

• 出版日期2014-4
• 单位北京大学