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演化问题的有限元外微积分

Finite Element Exterior Calculus for Evolution Problems

University of Arizona(亚利桑那大学);University of California San Diego(加州大学圣地亚哥分校);Idaho State University(爱达荷州立大学)

Andrew Gillette, Michael Holst, Yunrong Zhu

AI总结:

本文结合Hilbert复形理论与半离散有限元方法,将有限元外微积分框架拓展至抛物型和双曲型演化系统,建立了任意空间维度下混合方法的最优误差估计。

摘要:

Arnold、Falk和Winther [Bull. Amer. Math. Soc. 47 (2010), 281--354] 指出,混合变分问题及其混合方法数值逼近可以通过Hilbert复形的思想与工具得到最完整的理解。这导致了针对一大类线性椭圆问题的有限元外微积分(FEEC)的发展。最近,Holst和Stern [Found. Comp. Math. 12:3 (2012), 263--293 和 363--387] 将FEEC框架扩展到半线性问题以及包含变分犯罪的问题,从而能够分析和数值逼近任意空间维数黎曼流形上的线性和非线性几何椭圆偏微分方程,推广了曲面有限元逼近理论。在本文中,我们发展了FEEC的另一个独特扩展,即针对抛物型和双曲型演化系统,从而能够处理几何及其他演化问题。我们的方法是将近期关于椭圆问题的FEEC工作与通过半离散有限元方法求解演化问题的经典方法相结合,将演化问题的解视为位于时间参数化的Hilbert空间(或Bochner空间)中。基于Thomee针对抛物型问题和Geveci针对双曲型问题的经典方法,我们在自然的参数化Hilbert空间范数下建立了Galerkin有限元逼近的先验误差估计。特别地,我们恢复了Thomee和Geveci在二维区域和最低阶混合方法下的结果作为特例,有效地将其结果推广到任意空间维数和整个混合方法族。我们还展示了Holst和Stern框架如何允许将这些结果扩展到某些半线性演化问题。

英文摘要:

Arnold, Falk, and Winther [Bull. Amer. Math. Soc. 47 (2010), 281--354] showed that mixed variational problems, and their numerical approximation by mixed methods, could be most completely understood using the ideas and tools of Hilbert complexes. This led to the development of the Finite Element Exterior Calculus (FEEC) for a large class of linear elliptic problems. More recently, Holst and Stern [Found. Comp. Math. 12:3 (2012), 263--293 and 363--387] extended the FEEC framework to semi-linear problems, and to problems containing variational crimes, allowing for the analysis and numerical approximation of linear and nonlinear geometric elliptic partial differential equations on Riemannian manifolds of arbitrary spatial dimension, generalizing surface finite element approximation theory. In this article, we develop another distinct extension to the FEEC, namely to parabolic and hyperbolic evolution systems, allowing for the treatment of geometric and other evolution problems. Our approach is to combine the recent work on the FEEC for elliptic problems with a classical approach to solving evolution problems via semi-discrete finite element methods, by viewing solutions to the evolution problem as lying in time-parameterized Hilbert spaces (or Bochner spaces). Building on classical approaches by Thomee for parabolic problems and Geveci for hyperbolic problems, we establish a priori error estimates for Galerkin FEM approximation in the natural parametrized Hilbert space norms. In particular, we recover the results of Thomee and Geveci for two-dimensional domains and lowest-order mixed methods as special cases, effectively extending their results to arbitrary spatial dimension and to an entire family of mixed methods. We also show how the Holst and Stern framework allows for extensions of these results to certain semi-linear evolution problems.

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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