GEMM3D: An Edge Finite Element program for 3D modeling of electromagnetic fields and sensitivities for geophysical applications
| Autor: | Cícero Régis, Carlos Mateus Barriga Nunes |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Electromagnetic field
Computer science Fortran business.industry 0208 environmental biotechnology 02 engineering and technology Geophysics 010502 geochemistry & geophysics 3D modeling 01 natural sciences Finite element method 020801 environmental engineering Magnetotellurics Frequency domain Adjoint state method Computational electromagnetics Computers in Earth Sciences business computer 0105 earth and related environmental sciences Information Systems computer.programming_language |
| Zdroj: | Computers & Geosciences. 139:104477 |
| ISSN: | 0098-3004 |
| DOI: | 10.1016/j.cageo.2020.104477 |
| Popis: | This paper presents the 3D modeling program GEMM3D (Geophysical ElectroMagnetic Modeling 3D), a Fortran program for modeling frequency domain electromagnetic responses of geophysical sources in three-dimensional models. The program is an implementation of the Edge Finite Element method, in an electric field formulation, to simulate any electromagnetic source of interest, at all frequencies that are used in the geophysical methods in the quasi-static regime. Its current version includes routines for plane waves and simulation of magnetotelluric data; electrical and magnetic dipoles; circular loops. Other sources and configurations may easily be included with the addition of routines for simulating primary (layered earth) fields. The program includes routines for calculating sensitivities using the Adjoint State method, which makes efficient use of direct solvers for factoring once and solving for multiple systems with the same coefficient matrix. The paper details the methods, the implementation, and the usage of the program. Validation tests are presented for different sources. The program is freely available for use in research and teaching. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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