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arXiv 2302.07809math.NAcs.NA
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一个对流-扩散问题有限元离散化的注记

Notes on Finite Element Discretization for a Model Convection-Diffusion Problem

Constantin Bacuta, Daniel Hayes, Tyler O'Grady

摘要:

我们提出了最近的有限元数值结果的模型对流-扩散问题在奇异摄动的情况下,对流项占主导地位的问题。我们比较了标准的Galerkin离散使用的线性元与鞍点最小二乘离散,使用二次检验函数,试图控制和解释的非物理振荡的离散解决方案。我们还涉及到上缠绕Petrov-Galerkin方法和流线扩散离散方法,通过强调所产生的线性系和比较适当的误差范数。一些结果可以扩展到多维的情况下,以提出更一般的奇异摄动问题,包括对流为主的模型的有效近似。

英文摘要:

We present recent finite element numerical results on a model convection-diffusion problem in the singular perturbed case when the convection term dominates the problem. We compare the standard Galerkin discretization using the linear element with a saddle point least square discretization that uses quadratic test functions, trying to control and explain the non-physical oscillations of the discrete solutions. We also relate the up-winding Petrov-Galerkin method and the stream-line diffusion discretization method, by emphasizing the resulting linear systems and by comparing appropriate error norms. Some results can be extended to the multidimensional case in order to come up with efficient approximations for more general singular perturbed problems, including convection dominated models.

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