Numerical modeling of EM fields over local anomalies with a vertical axis of symmetry |
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Authors: | Michael S. Zhdanov Vjacheslav V. Spichak Leonid Yu. Zaslavsky |
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Affiliation: | Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation (IZMIRAN), U.S.S.R. Academy of Sciences, 142092, Troitsk, Moscow Region, U.S.S.R. |
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Abstract: | A method for numerical modeling of quasi-stationary electromagnetic fields in axially symmetric media is proposed. It is based on the direct finite-element method and the use of special basis functions. Assuming cylindrical coordinates r, φ, z, the three-dimensional solution is presented as a superposition of fields with the azimuthal dependence exp(inφ). For each case this results in a system of two equations of elliptical type in two scalar functions in the (r, z) plane. The discretization leads to the conservative nine-points difference scheme. The system of linear equations is solved by means of the LU-decomposition technique, the band structure of the matrix being taken into account. The program is tested using analytical results (DC asymptote) for a near-surface inhomogeneity. Comparison also is made with 2D results (H-polarization) for the model of a local well conducting inclusion in a three-layered Earth. |
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