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Mathematics of Computation

Published by the American Mathematical Society since 1960 (published as Mathematical Tables and other Aids to Computation 1943-1959), Mathematics of Computation is devoted to research articles of the highest quality in computational mathematics.

ISSN 1088-6842 (online) ISSN 0025-5718 (print)

The 2020 MCQ for Mathematics of Computation is 1.78.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.

 

Analysis of the boundary conditions for the ultraweak-local discontinuous Galerkin method of time-dependent linear fourth-order problems
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by Fengyu Fu, Chi-Wang Shu, Qi Tao and Boying Wu
Math. Comp.
DOI: https://doi.org/10.1090/mcom/3955
Published electronically: March 14, 2024

Abstract:

In this paper, we study the ultraweak-local discontinuous Galerkin (UWLDG) method for time-dependent linear fourth-order problems with four types of boundary conditions. In one dimension and two dimensions, stability and optimal error estimates of order $k+1$ are derived for the UWLDG scheme with polynomials of degree at most $k$ ($k\ge 1$) for solving initial-boundary value problems. The main difficulties are the design of suitable penalty terms at the boundary for numerical fluxes and the construction of projections. More precisely, in two dimensions with the Dirichlet boundary condition, an elaborate projection of the exact boundary condition is proposed as the boundary flux, which, in combination with some proper penalty terms, leads to the stability and optimal error estimates. For other three types of boundary conditions, optimal error estimates can also be proved for fluxes without any penalty terms when special projections are designed to match different boundary conditions. Numerical experiments are presented to confirm the sharpness of theoretical results.
References
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Bibliographic Information
  • Fengyu Fu
  • Affiliation: School of Mathematics, Harbin Institute of Technology, Harbin 150001, Heilongjiang, People’s Republic of China
  • MR Author ID: 1027169
  • Email: fengyu_fu@stu.hit.edu.cn
  • Chi-Wang Shu
  • Affiliation: Division of Applied Mathematics, Brown University, Providence, Rhode Island 02912
  • MR Author ID: 242268
  • ORCID: 0000-0001-7720-9564
  • Email: chi-wang_shu@brown.edu
  • Qi Tao
  • Affiliation: School of Mathematics, Statistics and Mechanics, Beijing University of Technology, Beijing 100124, People’s Republic of China
  • Email: taoqi@bjut.edu.cn
  • Boying Wu
  • Affiliation: School of Mathematics, Harbin Institute of Technology, Harbin 150001, Heilongjiang, People’s Republic of China
  • MR Author ID: 261930
  • Email: mathwby@hit.edu.cn
  • Received by editor(s): June 23, 2023
  • Received by editor(s) in revised form: January 26, 2024
  • Published electronically: March 14, 2024
  • Additional Notes: The research of the second author was supported by NSF grant DMS-2309249. The research of the third author was supported by NSFC grant 12301464. The research of the fourth author was supported by NSFC grant 12371419.
    The first author is the corresponding author
  • © Copyright 2024 American Mathematical Society
  • Journal: Math. Comp.
  • MSC (2020): Primary 65M12, 65M15, 65M60
  • DOI: https://doi.org/10.1090/mcom/3955