| Autor: |
Tae Jong Lee, Yonghyun Chung, Jeong-Sul Son, Hee Joon Kim, Changsoo Shin |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Geophysical Prospecting. 62:1468-1483 |
| ISSN: |
0016-8025 |
| DOI: |
10.1111/1365-2478.12132 |
| Popis: |
A fully three-dimensional finite-element algorithm has been developed for simulating controlled-source electromagnetic surveys. To exploit the advantages of geometric flexibility, frequency-domain Maxwell’s equations of the secondary electric field were discretised using edge-based finite elements while the primary field was calculated analytically for a horizontally layered-earth model. The resulting system of equations for the secondary field was solved using a parallel version of direct solvers. The accuracy of the algorithm was successfully verified by comparisons with integral-equations and iterative solutions, and the applicability to models containing large conductivity contrasts was verified against published data. The advantages of geometry-conforming meshes have been demonstrated by comparing different mesh systems to simulate an inclined sheet model. A comparison of the performance between direct and iterative solvers demonstrated the superior efficiency of direct solvers, particularly for multisource problems. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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