Geophysical modelling of 3D electromagnetic diffusion with multigrid

Title

Geophysical modelling of 3D electromagnetic diffusion with multigrid

 Author

Mulder, W.A.

Faculty

Civil Engineering and Geosciences

 Department

Geoscience & Engineering

 Date

2008-05-01

 Abstract

The performance of a multigrid solver for time-harmonic electromagnetic problems in geophysical settings was investigated. With the low frequencies used in geophysical surveys for deeper targets, the light-speed waves in the earth can be neglected. Diffusion of induced currents is the dominant physical effect. The governing equations were discretised by the Finite-Integration Technique. The resulting set of discrete equation was solved by a multigrid method. The multigrid method provided excellent convergence with constant grid spacings, but not on stretched grids. The slower convergence rate of the multigrid method could be compensated by using bicgstab2, in which case multigrid acted as a preconditioner. Still, the overall performance was less than satisfactory with substantial grid stretching.

 To reference this document use:

http://resolver.tudelft.nl/uuid:997f4788-e72f-4506-9049-b6b1c3c3c3e5

 Publisher

Springer

 ISSN

1432-9360

 Source

https://doi.org/10.1007/s00791-007-0064-y

 Source

Computing and Visualization in Science, 11 (3), 2008; authors version

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

(c) 2007 Mulder, W.A.
Shell International Exploration and Production
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