期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 57, 期 6, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2021.3068346
关键词
Difference schemes; finite difference (FD) time domain; material interfaces; Trefftz approximations
资金
- U.S. National Science Foundation [DMS-1216927, DMS-1620112]
The article examines local approximation errors of finite-difference schemes in electromagnetic analysis and proposes two novel methods for comparison. It concludes that a loss of accuracy for Yee-like schemes at slanted material boundaries is unavoidable.
The article examines local approximation errors of finite-difference schemes in electromagnetic analysis. Despite a long history of the subject, several accuracy-related issues have been overlooked and/or remain controversial. For example, conflicting claims have been made in the literature about the order of Yee-like schemes in the vicinity of slanted or curved material interfaces. Two novel practical methods for comparison of local accuracy of difference schemes are proposed: one makes use of Trefftz test matrices, and the other one relies on a new measure of approximation accuracy in scheme-exact Trefftz subspaces. One particular conclusion is that a loss of accuracy for Yee-like schemes at slanted material boundaries is unavoidable.
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