NDLI: Efficiency Based Adaptive Local Refinement for First-Order System Least-Squares Formulations

Content Provider	Society for Industrial and Applied Mathematics (SIAM)
Author	Manteuffel, T. A. Ruge, J. W. Tang, L. McCormick, S. F. Nolting, J. W. Adler, J. H.
Copyright Year	2011
Abstract	In this paper, we propose new adaptive local refinement (ALR) strategies for first-order system least-squares finite elements in conjunction with algebraic multigrid methods in the context of nested iteration. The goal is to reach a certain error tolerance with the least amount of computational cost and nearly uniform distribution of the error over all elements. To accomplish this, the refinement decision at each refinement level is determined based on optimizing efficiency measures that take into account both error reduction and computational cost. Two efficiency measures are discussed: predicted error reduction and predicted computational cost. These methods are first applied to a two-dimensional (2D) Poisson problem with steep gradients, and the results are compared with the threshold-based methods described in [W. Drfler, SIAM J. Numer. Anal., 33 (1996), pp. 11061124]. Next, these methods are applied to a 2D reduced model of the incompressible, resistive magnetohydrodynamic equations. These equations are used to simulate instabilities in a large aspect-ratio tokamak. We show that, by using the new ALR strategies on this system, we are able to resolve the physics using only 10 percent of the computational cost used to approximate the solutions on a uniformly refined mesh within the same error tolerance.
Starting Page	1
Ending Page	24
Page Count	24
File Format	PDF
ISSN	10648275
DOI	10.1137/100786897
e-ISSN	10957197
Issue Number	1
Volume Number	33
Language	English
Publisher	Society for Industrial and Applied Mathematics
Publisher Date	2011-01-06
Access Restriction	Subscribed
Subject Keyword	first-order system least-squares adaptive local refinement Iterative methods for linear systems magnetohydrodynamics Mesh generation and refinement Magnetohydrodynamics and electrohydrodynamics nested iteration algebraic multigrid Multigrid methods; domain decomposition
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Computational Mathematics

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