Application of the perfectly matched layer in 2.5D marine controlled-source electromagnetic modeling.

Li, Gang and Han, Bo (2017) Application of the perfectly matched layer in 2.5D marine controlled-source electromagnetic modeling. Physics of the Earth and Planetary Interiors, 270 . pp. 157-167. DOI 10.1016/j.pepi.2017.07.006.

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Supplementary data:

Abstract

Highlights

• The complex frequency-shifted perfectly matched layer (CFS-PML) in stretching Cartesian coordinates is applied to 2.5D frequency-domain marine CSEM modeling.
• This PML modeling algorithm presented is approved to be fast and stable.
• The CFL-PML modeling can be easily extended into 3D case.

Abstract

For the traditional framework of EM modeling algorithms, the Dirichlet boundary is usually used which assumes the field values are zero at the boundaries. This crude condition requires that the boundaries should be sufficiently far away from the area of interest. Although cell sizes could become larger toward the boundaries as electromagnetic wave is propagated diffusively, a large modeling area may still be necessary to mitigate the boundary artifacts. In this paper, the complex frequency-shifted perfectly matched layer (CFS-PML) in stretching Cartesian coordinates is successfully applied to 2.5D frequency-domain marine controlled-source electromagnetic (CSEM) field modeling. By using this PML boundary, one can restrict the modeling area of interest to the target region. Only a few absorbing layers surrounding the computational area can effectively depress the artificial boundary effect without losing the numerical accuracy. A 2.5D marine CSEM modeling scheme with the CFS-PML is developed by using the staggered finite-difference discretization. This modeling algorithm using the CFS-PML is of high accuracy, and shows advantages in computational time and memory saving than that using the Dirichlet boundary. For 3D problem, this computation time and memory saving should be more significant.

Document Type: Article
Keywords: Marine electromagnetics; Perfectly matched layer (PML); 2.5D
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
Publisher: Elsevier
Date Deposited: 03 Aug 2017 07:40
Last Modified: 06 Feb 2020 09:12
URI: https://oceanrep.geomar.de/id/eprint/38935

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