A family of 3D H2-nonconforming tetrahedral finite elements for the biharmonic equation

• 作者: Jun Hu Shangyou Zhang Shudan Tian
• 来源期刊: 中国科学：数学（英文版）
• 年，卷（期）: 2020,（8）
• 所属期刊栏目: Progress of Projects Supported by NSFC
• 页码范围: 1505-1522
• 页数: 18页
• 语种: 英文

摘要

In this article,a family of H2-nonconforming finite elements on tetrahedral grids is constructed for solving the biharmonic equation in 3D.In the family,the Pe polynomial space is enriched by some high order polynomials for all g ≥ 3 and the corresponding finite element solution converges at the order g-1 in H2 norm.Moreover,the result is improved for two low order cases by using P6 and P7 polynomials to enrich P4 and P5 polynomial spaces,respectively.The error estimate is proved.The numerical results are provided to confirm the theoretical findings.