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- W4291915034 abstract "PreviousNext No AccessSecond International Meeting for Applied Geoscience & EnergyAn immersed absorbing boundary condition for scalar wavefield modeling under topographyAuthors: KeJi ChenHanming ChenHui ZhouKeJi ChenChina University of Petroleum (Beijing)Search for more papers by this author, Hanming ChenChina University of Petroleum (Beijing)Search for more papers by this author, and Hui ZhouChina University of Petroleum (Beijing)Search for more papers by this authorhttps://doi.org/10.1190/image2022-3751250.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractThe irregular surface is an important aspect that needs be considered in finite-difference (FD) numerical simulations of seismic waves. To avoid the artificial edge reflections from the irregular surface, an effective absorbing boundary condition (ABC) should be designed with consideration of the topography. However, the FD methods usually use a rectangular grid discretization that causes a staircase problem in approximating the irregular surface. Additionally, the current ABC often assumes a horizontal interface between the interior computational domain and the top absorbing domain, which is the not case when an irregular surface exists. To avoid the spurious scattering caused by the staircase and adjust the ABC to irregular surfaces, we develop an immersed ABC for scalar wavefield modeling. We place the irregular surface at fractional grid nodes according to the true topography and we predict the wavefields at ghost grid points by a plane-wave transmitting boundary condition (BC). The ghost grid points refer to those grid nodes required by the interior FD calculations and the wavefield prediction is implemented along the normal direction of the surface, which means wavefield absorption along the normal direction. Numerical examples are presented to verify the feasibility of our immersed ABC under topography.Keywords: finite difference, irregular surface, immersed absorbing boundary conditionPermalink: https://doi.org/10.1190/image2022-3751250.1FiguresReferencesRelatedDetails Second International Meeting for Applied Geoscience & EnergyISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2022 Pages: 3694 publication data© 2022 Published in electronic format with permission by the Society of Exploration Geophysicists and the American Association of Petroleum GeologistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 15 Aug 2022 CITATION INFORMATION KeJi Chen, Hanming Chen, and Hui Zhou, (2022), An immersed absorbing boundary condition for scalar wavefield modeling under topography, SEG Technical Program Expanded Abstracts : 2532-2536. https://doi.org/10.1190/image2022-3751250.1 Plain-Language Summary Keywordsfinite differenceirregular surfaceimmersed absorbing boundary conditionPDF DownloadLoading ..." @default.
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