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Attaining exponential convergence for the flux error with second- and fourth-order accurate finite-difference equations. I. Presentation of the basic concept and application to a pure diffusion system

✍ Scribed by Manfred Rudolph

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
213 KB
Volume
26
Category
Article
ISSN
0192-8651

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✦ Synopsis

Abstract

It is a well‐known phenomenon called superconvergence in the mathematical literature that the error level of an integral quantity can be much smaller than the magnitude of the local errors involved in the computation of this quantity. When discretizing an integrated form of Fick's second law of diffusion the local errors reflect the accuracy of individual concentration points while the integral quantity has the physical meaning of the flux. This article demonstrates how an extraordinary fast exponential convergence towards zero can be achieved for the simulated flux error on the basis of finite–difference approximations that are only second‐order (Box 2 method) or fourth‐order (Box 4 method) accurate as far as the level of local errors is concerned. © 2005 Wiley Periodicals, Inc. J Comput Chem 26: 619–632, 2005

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## Abstract This article demonstrates that exponential convergence of the flux error can be attained with second‐ and fourth‐order accurate finite difference equations even for such electrochemical kinetic‐diffusion systems where difficult‐to‐resolve solution structures occur on account of fast sec