An efficient full-wave solver for eddy currents
(2022) In Computers and Mathematics with Applications 128. p.145-162- Abstract
An integral equation reformulation of the Maxwell transmission problem is presented. The reformulation uses techniques such as tuning of free parameters and augmentation of close-to-rank-deficient operators. It is designed for the eddy current regime and works both for surfaces of genus 0 and 1. Well-conditioned systems and field representations are obtained despite the Maxwell transmission problem being ill-conditioned for genus 1 surfaces due to the presence of Neumann eigenfields. Furthermore, it is shown that these eigenfields, for ordinary conductors in the eddy current regime, are different from the classical Neumann eigenfields for superconductors. Numerical examples, based on the reformulation, give an unprecedented 13-digit... (More)
An integral equation reformulation of the Maxwell transmission problem is presented. The reformulation uses techniques such as tuning of free parameters and augmentation of close-to-rank-deficient operators. It is designed for the eddy current regime and works both for surfaces of genus 0 and 1. Well-conditioned systems and field representations are obtained despite the Maxwell transmission problem being ill-conditioned for genus 1 surfaces due to the presence of Neumann eigenfields. Furthermore, it is shown that these eigenfields, for ordinary conductors in the eddy current regime, are different from the classical Neumann eigenfields for superconductors. Numerical examples, based on the reformulation, give an unprecedented 13-digit accuracy both for transmitted and scattered fields.
(Less)
- author
- Helsing, Johan LU ; Karlsson, Anders LU and Rosén, Andreas
- organization
- publishing date
- 2022-12
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Boundary integral equation, Eddy current, Low-frequency breakdown, Maxwell transmission problem, Neumann eigenfield
- in
- Computers and Mathematics with Applications
- volume
- 128
- pages
- 18 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85140650499
- ISSN
- 0898-1221
- DOI
- 10.1016/j.camwa.2022.10.018
- language
- English
- LU publication?
- yes
- id
- a9ecdf2d-c717-4364-a561-e82f084cde2b
- date added to LUP
- 2022-12-06 11:34:53
- date last changed
- 2022-12-06 11:34:53
@article{a9ecdf2d-c717-4364-a561-e82f084cde2b,
abstract = {{<p>An integral equation reformulation of the Maxwell transmission problem is presented. The reformulation uses techniques such as tuning of free parameters and augmentation of close-to-rank-deficient operators. It is designed for the eddy current regime and works both for surfaces of genus 0 and 1. Well-conditioned systems and field representations are obtained despite the Maxwell transmission problem being ill-conditioned for genus 1 surfaces due to the presence of Neumann eigenfields. Furthermore, it is shown that these eigenfields, for ordinary conductors in the eddy current regime, are different from the classical Neumann eigenfields for superconductors. Numerical examples, based on the reformulation, give an unprecedented 13-digit accuracy both for transmitted and scattered fields.</p>}},
author = {{Helsing, Johan and Karlsson, Anders and Rosén, Andreas}},
issn = {{0898-1221}},
keywords = {{Boundary integral equation; Eddy current; Low-frequency breakdown; Maxwell transmission problem; Neumann eigenfield}},
language = {{eng}},
pages = {{145--162}},
publisher = {{Elsevier}},
series = {{Computers and Mathematics with Applications}},
title = {{An efficient full-wave solver for eddy currents}},
url = {{http://dx.doi.org/10.1016/j.camwa.2022.10.018}},
doi = {{10.1016/j.camwa.2022.10.018}},
volume = {{128}},
year = {{2022}},
}