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arXiv 2012.12374math.NAcs.NA
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多边形区域上Navier边值问题的$C^0$有限元法

A $C^0$ finite element method for the biharmonic problem with Navier boundary conditions in a polygonal domain

Hengguang Li, Peimeng Yin, Zhimin Zhang

摘要:

本文研究了多边形区域上具有Navier边界条件的双调和方程。特别是,我们提出了一种方法,有效地将四阶问题转化为一个系统的泊松方程。不同于通常的混合方法导致两个泊松问题,但只适用于凸区域,建议的分解涉及第三个泊松方程,以限制在正确的函数空间的解决方案,因此,可以使用在凸和非凸区域。进而提出了一种$C^0$有限元算法来求解所得到的系统。此外,我们还在拟均匀网格和梯度网格上得到了数值解的最优误差估计。数值试验结果证明理论研究结果。

英文摘要:

In this paper, we study the biharmonic equation with the Navier boundary conditions in a polygonal domain. In particular, we propose a method that effectively decouples the 4th-order problem into a system of Poisson equations. Different from the usual mixed method that leads to two Poisson problems but only applies to convex domains, the proposed decomposition involves a third Poisson equation to confine the solution in the correct function space, and therefore can be used in both convex and non-convex domains. A $C^0$ finite element algorithm is in turn proposed to solve the resulted system. In addition, we derive the optimal error estimates for the numerical solution on both quasi-uniform meshes and graded meshes. Numerical test results are presented to justify the theoretical findings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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