Considering a singularly perturbed convection-diffusion problem, we present an analysis for a superconvergence result using pointwise interpolation of Gau{\ss}-Lobatto type for higher-order streamline diffusion FEM. We show a useful connection between two different types of interpolation, namely a vertex-edge-cell interpolant and a pointwise interpolant. Moreover, different postprocessing operators are analysed and applied to model problems.
翻译:考虑到一个异常受扰动的对流分解扩散问题,我们提出一种分析,用高(Gaus)-Lobbatto型号的点推法进行超趋同结果分析,以简化高(Gaus)ys}-Lobatto型号的较高级(FEM)的传播。我们显示了两种不同类型的内推法之间的有益联系,即顶端-顶端细胞内插法和中点内插法。此外,对不同的后处理操作器进行了分析,并应用于模型问题。</s>