Optimal estimation for the Fujino–Morley interpolation error constants

Abstract

The quantitative estimation for the interpolation error constants of the Fujino–Morley interpolation operator is considered. To give concrete upper bounds for the constants, which is reduced to the problem of providing lower bounds for eigenvalues of bi-harmonic operators, a new algorithm based on the finite element method along with verified computation is proposed. In addition, the quantitative analysis for the variation of eigenvalues upon the perturbation of the shape of triangles is provided. Particularly, for triangles with longest edge length less than one, the optimal estimation for the constants is provided. An online demo with source codes of the constants calculation is available at http://www.xfliu.org/onlinelab/.

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Notes

  1. 1.

    The element discussed here is often called by “Morley element” in the existing literature. However, the same element is also proposed independently by Fujino in P. 739 of [5] (proceedings of a conference on 1969), which is also cited by Morley in [12].

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Acknowledgements

The authors would like to thank for the support from the Ministry of Science and Technology, Taiwan, ROC under Grant nos. MOST 106-2115-M-006-011, MOST 107-2911-M-006-506. This research is also supported by Japan Society for the Promotion of Science, Grand-in-Aid for Young Scientist (B) 26800090, Grant-in-Aid for Scientific Research (C) 18K03411 and Grant-in-Aid for Scientific Research (B) 16H03950 for the third author.

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Correspondence to Xuefeng Liu.

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Liao, S., Shu, Y. & Liu, X. Optimal estimation for the Fujino–Morley interpolation error constants. Japan J. Indust. Appl. Math. 36, 521–542 (2019). https://doi.org/10.1007/s13160-019-00351-9

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Keywords

  • Fujino–Morley interpolation operator
  • Finite element method
  • Verified computing
  • Eigenvalue problem

Mathematics Subject Classification

  • 35P15
  • 97N50
  • 65N30