期刊
COMPUTERS & GEOSCIENCES
卷 99, 期 -, 页码 125-134出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cageo.2016.11.009
关键词
Geophysical electromagnetics; Conductivity anisotropy; Finite element; Total field formulation; Multifrontal solver
资金
- National Natural Science Foundation of China [41674075]
- Guangxi Natural Science Foundation [2016GXNSFGA380004]
- high-level innovative team and excellent scholar plan of Guangxi High Education Institution
We solve the 3D controlled-source electromagnetic (CSEM) problem using the edge-based finite element method. The modeling domain is discretized using unstructured tetrahedral mesh. We adopt the total field formulation for the quasi-static variant of Maxwell's equation and the computation cost to calculate the primary field can be saved. We adopt a new boundary condition which approximate the total field on the boundary by the primary field corresponding to the layered earth approximation of the complicated conductivity model. The primary field on the modeling boundary is calculated using fast Hankel transform. By using this new type of boundary condition, the computation cost can be reduced significantly and the modeling accuracy can be improved. We consider that the conductivity can be anisotropic. We solve the finite element system of equations using a parallelized multifrontal solver which works efficiently for multiple source and large scale electromagnetic modeling.
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