p-multigrid method for DG discretization of elliptic problems with discontinuous coefficients

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:郑伟英(中国科学院数学与系统科学研究院)
:2025-03-31 16:45
:海韵园行政楼C503

报告人:郑伟英中国科学院数学与系统科学研究院

 间:202533116:45

 点:海韵园行政楼C503

内容摘要:

We propose a W-cycle p-multigrid method for solving the p-version DG discretization of elliptic problems with discontinuous coefficients. The DG scheme employs hierarchical and orthogonal bases. We provide a rigorous convergence analysis for the p-multigrid method, using both inherited and non-inherited bilinear forms of the DG formulation. The convergence rate is uniform to the mesh size h, the polynomial degree p, and the ratio of discontinuous coefficients. Our method shows competitive behavior by reducing the number of smoothing steps from O(p^2) in the literature to O(p). Extensive numerical experiments are presented to verify our theoretical results.

人简介

郑伟英,中国科学院数学与系统科学研究院研究员,“数学科学”全国重点实验室副主任。长期从事电磁场和半导体器件的计算方法和理论研究,在Maxwell方程自适应多重网格方法的最优收敛性、电磁散射的算法和理论等方面取得多项重要进展。曾获国家磁约束聚变人才专项、国家杰出青年科学基金等资助,2021年获冯康科学计算奖。

 

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