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Regularization for accurate numerical wave propagation in discontinuous media
KTH, School of Computer Science and Communication (CSC), Numerical Analysis, NA.
KTH, School of Computer Science and Communication (CSC), Numerical Analysis, NA.
2006 (English)In: Methods and Applications of Analysis, ISSN 1073-2772, E-ISSN 1945-0001, Vol. 13, no 3, 247-274 p.Article in journal (Refereed) Published
Abstract [en]

Structured computational grids are the basis for highly efficient numerical approximations of wave propagation. When there are discontinuous material coefficients the accuracy is typically reduced and there may also be stability problems. In a sequence of recent papers Gustafsson et al. proved stability of the Yee scheme and a higher order difference approximation based on a similar staggered structure, for the wave equation with general coefficients. In this paper, the Yee discretization is improved from first to second order by modifying the material coefficients close to the material interface. This is proven in the $L^2$ norm. The modified higher order discretization yields a second order error component originating from the discontinuities, and a fourth order error from the smooth regions. The efficiency of each original method is retained since there is no special structure in the difference stencil at the interface. The main focus of this paper is on one spatial dimension, with the derivation of a second order algorithm for a two dimensional example given in the last section

Place, publisher, year, edition, pages
2006. Vol. 13, no 3, 247-274 p.
National Category
Computational Mathematics
URN: urn:nbn:se:kth:diva-59153OAI: diva2:475277
QC 20120112Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2012-01-12Bibliographically approved

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Tornberg, Anna-KarinEngquist, Björn
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