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A class of improved characteristic finite element method for convection-diffusion equation

机译:对流扩散方程的一类改进的特征有限元方法

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Characteristics finite element methods have been proved available for numerical approximation of convection-diffusion equations. All of the existed schemes of characteristic finite element or finite difference methods are limited to have only one order accuracy in time increment. In this paper, we introduce a new variational formulation after some important modification for convection and diffusion terms. Then we proposed a class of characteristic finite element scheme from the variation formulation. We also prove that the proposed scheme has second order accuracy in time increment and the optimal errr estimates in both of H~1 and L~2 norms.
机译:特征有限元方法已被证明可用于对流扩散方程的数值逼近。现有的所有特征有限元方法或有限差分方法都限于在时间增量上仅具有一阶精度。在本文中,我们在对流和扩散项进行了一些重要的修改之后,介绍了一种新的变分形式。然后,根据变化公式提出了一种特征有限元方案。我们还证明了该方案在时间增量上具有二阶精度,并且在H〜1和L〜2范数中均具有最佳errr估计。

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