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arXiv 1907.01397math.NAcs.NA
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协调间断Galerkin有限元法:II部分

A conforming discontinuous Galerkin finite element method: Part II

Xiu Ye, Shangyou Zhang

摘要:

文献[21]在单纯网格上引入了协调间断Galerkin(DG)有限元法,它既具有间断逼近的灵活性,又具有经典连续有限元法的简洁性。本文的目的是通过适当地设计弱梯度$\nabla_w$,将\cite{cdg1}中的协调DG有限元法推广到一般多边形网格上。两种不同的协调DG配方的多面体网格上介绍了不同的处理边界条件。在离散$H^1$范数和$L^2$范数下,分别建立了相应的一致DG逼近的最优阶误差估计.数值结果证实了理论。

英文摘要:

A conforming discontinuous Galerkin (DG) finite element method has been introduced in [21] on simplicial meshes, which has the flexibility of using discontinuous approximation and the simplicity in formulation of the classic continuous finite element method. The goal of this paper is to extend the conforming DG finite element method in \cite{cdg1} so that it can work on general polytopal meshes by designing weak gradient $\nabla_w$ appropriately. Two different conforming DG formulations on polytopal meshes are introduced which handle boundary conditions differently. Error estimates of optimal order are established for the corresponding conforming DG approximation in both a discrete $H^1$ norm and the $L^2$ norm. Numerical results are presented to confirm the theory.

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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