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arXiv 2402.03574math.NAcs.NA
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对流扩散问题的有限差分与有限元逼近之间的联系

Connections Between Finite Difference and Finite Element Approximations for a Convection-Diffusion Problem

Constantin Bacuta, Cristina Bacuta

AI总结:

本文建立对流扩散问题中有限差分与有限元离散的联系,提出基于气泡修正的迎风Petrov-Galerkin方法,证明其可恢复精确解插值,并改进迎风有限差分方法及误差估计。

摘要:

我们考虑一个模型对流扩散问题,并展示有限差分与有限元离散化方法之间的有用联系。我们引入一种基于测试空间气泡修正的一般迎风Petrov-Galerkin离散化,并将该方法与有限差分离散化中使用的一般迎风方法联系起来。我们写出有限差分和有限元系统,使得两个相应的线性系统具有相同的刚度矩阵,并比较两种方法的右端载荷向量。这种新方法允许改进众所周知的迎风有限差分方法并获得新的误差估计。我们证明指数气泡Petrov-Galerkin离散化可以恢复精确解的插值。因此,我们估计相关有限差分解与插值的接近程度。我们在这项工作中提出的想法,可以为多维对流主导问题构建高效的新离散化方法。

英文摘要:

We consider a model convection-diffusion problem and present useful connections between the finite differences and finite element discretization methods. We introduce a general upwinding Petrov-Galerkin discretization based on bubble modification of the test space and connect the method with the general upwinding approach used in finite difference discretization. We write the finite difference and the finite element systems such that the two corresponding linear systems have the same stiffness matrices, and compare the right hand side load vectors for the two methods. This new approach allows for improving well known upwinding finite difference methods and for obtaining new error estimates. We prove that the exponential bubble Petrov-Galerkin discretization can recover the interpolant of the exact solution. As a consequence, we estimate the closeness of the related finite difference solutions to the interpolant. The ideas we present in this work, can lead to building efficient new discretization methods for multidimensional convection dominated problems.

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