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    Conditioning of finite element equations with arbitrary anisotropic meshes

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    HuangW_SJoSC_83(289)2187.pdf (470.7Kb)
    Issue Date
    2014-03-05
    Author
    Kamenski, Lennard
    Huang, Weizhang
    Xu, Hongguo
    Publisher
    American Mathematical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Bounds are developed for the condition number of the linear finite element equations of an anisotropic diffusion problem with arbitrary meshes. They depend on three factors. The first factor is proportional to a power of the number of mesh elements and represents the condition number of the linear finite element equations for the Laplacian operator on a uniform mesh. The other two factors arise from the mesh nonuniformity viewed in the Euclidean metric and in the metric defined by the diffusion matrix. The new bounds reveal that the conditioning of the finite element equations with adaptive anisotropic meshes is much better than what is commonly assumed. Diagonal scaling for the linear system and its effects on the conditioning are also studied. It is shown that the Jacobi preconditioning, which is an optimal diagonal scaling for a symmetric positive definite sparse matrix, can eliminate the effects of mesh nonuniformity viewed in the Euclidean metric and reduce those effects of the mesh viewed in the metric defined by the diffusion matrix. Tight bounds on the extreme eigenvalues of the stiffness and mass matrices are obtained. Numerical examples are given.
    Description
    This is the published version, also available here: http://dx.doi.org/10.1090/S0025-5718-2014-02822-6. First published in Math. Comput. in 2014, published by the American Mathematical Society
    URI
    http://hdl.handle.net/1808/16778
    DOI
    https://doi.org/10.1090/S0025-5718-2014-02822-6
    Collections
    • Mathematics Scholarly Works [282]
    Citation
    Kamenski, Lennard., Huang, Weizhang., Xu, Hongguo. "Conditioning of finite element equations with arbitrary anisotropic meshes." Math. Comput. Volume 83, Number 289, September 2014, Pages 2187–2211. http://dx.doi.org/10.1090/S0025-5718-2014-02822-6.

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    KU Libraries
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    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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