Print Email Facebook Twitter Time-domain modeling of electromagnetic diffusion with a frequency-domain code Title Time-domain modeling of electromagnetic diffusion with a frequency-domain code Author Mulder, W.A. Wirianto, M. Slob, E.C. Faculty Civil Engineering and Geosciences Department Geotechnology Date 2007-11-13 Abstract We modeled time-domain EM measurements of induction currents for marine and land applications with a frequency-domain code. An analysis of the computational complexity of a number of numerical methods shows that frequency-domain modeling followed by a Fourier transform is an attractive choice if a sufficiently powerful solver is available. A recently developed, robust multigrid solver meets this requirement. An interpolation criterion determined the automatic selection of frequencies. The skin depth controlled the construction of the computational grid at each frequency. Tests of the method against exact solutions for some simple problems and a realistic marine example demonstrate that a limited number of frequencies suffice to provide time-domain solutions after piecewise-cubic Hermite interpolation and a fast Fourier transform. Subject Fourier transformsfrequency-domain analysisterrestrial electricitytime-domain analysis To reference this document use: http://resolver.tudelft.nl/uuid:15b145d7-d09e-41a5-ad30-55ba7899e9a8 DOI https://doi.org/10.1190/1.2799093 Publisher Society of Exploration Geophysicists ISSN 0016-8033 Source Geophysics, 73 (1), 2008 Part of collection Institutional Repository Document type journal article Rights © 2008 Society of Exploration Geophysicists Files PDF Slob_2008.pdf 1.07 MB Close viewer /islandora/object/uuid:15b145d7-d09e-41a5-ad30-55ba7899e9a8/datastream/OBJ/view