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Accuracy of FEM 3-D modeling in the electromagnetic methods; Denjiho ni okeru FEM 3 jigen modeling no seido

Abstract

Analytical methods considering 3-D resistivity distribution, in particular, finite element method (FEM) were studied to improve the reliability of electromagnetic exploration. Integral equation, difference calculus, FEM and hybrid method are generally used as computational 3-D modeling method. FEM is widely used in various fields because FEM can easily handle complicated shapes and boundaries. However, in electromagnetic method, the assumption of continuous electric field is pointed out as important problem. The normal (orthogonal) component of current density should be continuous at the boundary between media with different conductivities, while this means that the normal component of electric field is discontinuous. In FEM, this means that current channeling is not properly considered, resulting in poor accuracy. Unless this problem is solved, FEM modeling is not practical. As one of the solutions, it is promising to specifically incorporate interior boundary conditions into element equation. 4 refs., 11 figs.
Authors:
Sasaki, Y [1] 
  1. Kyushu University, Fukuoka (Japan). Faculty of Engineering
Publication Date:
Oct 01, 1996
Product Type:
Conference
Report Number:
CONF-9610294-
Reference Number:
SCA: 440700; 580000; 990200; 150301; PA: NEDO-96:914786; EDB-97:075230; SN: 97001782563
Resource Relation:
Conference: 95. SEGJ conference, Butsuri tansa gakkai dai 95 kai (1996 nendo shuki) gakujutsu koenkai, Kyoto (Japan), 21-23 Oct 1996; Other Information: PBD: Oct 1996; Related Information: Is Part Of Proceedings of the 95th SEGJ Conference; PB: 344 p.; Butsuri tansa gakkai dai 95 kai (1996 nendo shuki) gakujutsu koenkai koen ronbunshu
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 58 GEOSCIENCES; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; 15 GEOTHERMAL ENERGY; ELECTROMAGNETIC SURVEYS; MATHEMATICAL MODELS; SPACE DEPENDENCE; ELECTRIC CONDUCTIVITY; FINITE ELEMENT METHOD; ACCURACY; COMPLEX TERRAIN; BOUNDARY CONDITIONS; CURRENT DENSITY; ELECTRIC FIELDS; CHANNELING
OSTI ID:
472692
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97743637; TRN: 96:914786
Availability:
Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97743637
Submitting Site:
NEDO
Size:
pp. 265-269
Announcement Date:
Jun 03, 1997

Citation Formats

Sasaki, Y. Accuracy of FEM 3-D modeling in the electromagnetic methods; Denjiho ni okeru FEM 3 jigen modeling no seido. Japan: N. p., 1996. Web.
Sasaki, Y. Accuracy of FEM 3-D modeling in the electromagnetic methods; Denjiho ni okeru FEM 3 jigen modeling no seido. Japan.
Sasaki, Y. 1996. "Accuracy of FEM 3-D modeling in the electromagnetic methods; Denjiho ni okeru FEM 3 jigen modeling no seido." Japan.
@misc{etde_472692,
title = {Accuracy of FEM 3-D modeling in the electromagnetic methods; Denjiho ni okeru FEM 3 jigen modeling no seido}
author = {Sasaki, Y}
abstractNote = {Analytical methods considering 3-D resistivity distribution, in particular, finite element method (FEM) were studied to improve the reliability of electromagnetic exploration. Integral equation, difference calculus, FEM and hybrid method are generally used as computational 3-D modeling method. FEM is widely used in various fields because FEM can easily handle complicated shapes and boundaries. However, in electromagnetic method, the assumption of continuous electric field is pointed out as important problem. The normal (orthogonal) component of current density should be continuous at the boundary between media with different conductivities, while this means that the normal component of electric field is discontinuous. In FEM, this means that current channeling is not properly considered, resulting in poor accuracy. Unless this problem is solved, FEM modeling is not practical. As one of the solutions, it is promising to specifically incorporate interior boundary conditions into element equation. 4 refs., 11 figs.}
place = {Japan}
year = {1996}
month = {Oct}
}