Multiscale parallel simulation of arbitrary waveforms for time-domain electromagnetic data

PreviousNext No AccessFirst International Meeting for Applied Geoscience & Energy Expanded AbstractsMultiscale parallel simulation of arbitrary waveforms for time-domain electromagnetic dataAuthors: Ming ChengDikun YangMing ChengSouthern University of Science and TechnologySearch for more papers by this author and Dikun YangSouthern University of Science and TechnologySearch for more papers by this authorhttps://doi.org/10.1190/segam2021-3594999.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractThe simulation of time-domain electromagnetic fields often uses the technique of time stepping. A time stepping is a sequential computing process, as early times must be stepped through before late times. In this paper, we propose an approach to parallelize the calculation in time domain for an improved efficiency. Our approach, based on the theory of survey decomposition and the concept of scale matching, computes the time-domain responses of each time channel separately in parallel. The computational efficiency comes from two ideas. First, time-domain EM fields diffuse at later times, so each time channel can be stepped at a step length adapted to its temporal scale. Second, simulation of the entire on-time waveform may not be necessary – early time channels only need a narrow portion of the pulse width. Exploiting those two properties, our approach first empirically determines a characteristic step length (Δt) for a particular time channel. Then a step-off response is obtained by stepping at a constant Δt; the discrete impulse response can be calculated by differentiating the step-off response by Δt. Finally, the discrete impulse response is convolved with the effective part of the source waveform discretized by Δt. By experimenting with four airborne TEM waveforms and a large number of random models, we obtain a set of empirical parameters for Δt and for the effective pulse width. The improvement in efficiency is demonstrated by a 3D time-domain EM example.Keywords: 3D, numerical, time-domain, multiscalePermalink: https://doi.org/10.1190/segam2021-3594999.1FiguresReferencesRelatedDetails First International Meeting for Applied Geoscience & Energy Expanded AbstractsISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2021 Pages: 3561 publication data© 2021 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 01 Sep 2021 CITATION INFORMATION Ming Cheng and Dikun Yang, (2021), "Multiscale parallel simulation of arbitrary waveforms for time-domain electromagnetic data," SEG Technical Program Expanded Abstracts : 543-547. https://doi.org/10.1190/segam2021-3594999.1 Plain-Language Summary Keywords3Dnumericaltime-domainmultiscalePDF DownloadLoading ...