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arXiv 2401.02249math.NAcs.NA
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对流扩散方程守恒形式的高阶时间与空间Lagrange-Galerkin方法

High order Lagrange-Galerkin methods for the conservative formulation of the advection-diffusion equation

Rodolfo Bermejo, Manuel Colera

AI总结:

本文研究了对流扩散方程守恒形式的高阶时空Lagrange-Galerkin方法,采用BDF时间离散,基于时变有限元框架分析误差,揭示扩散与对流两种区域的收敛性差异。

摘要:

本文介绍了对流扩散方程守恒形式的时间与空间高阶Lagrange-Galerkin方法的数值分析。作为时间离散方案,我们考虑了最高阶为q=5的Backward Differentiation Formulas。方法的开发与分析在C. M. Elliot和T. Ranner(IMA Journal of Numerical Analysis 41, 1696-1845, 2021)提出的时变有限元框架内进行。误差估计通过其对参数的依赖性表明,数值解行为中存在不同区域:即在扩散区域,即当扩散参数μ较大时,误差为O(h^{k+1}+Δt^{q});而在对流区域,μ≪1时,收敛性为O(min(h^{k}, h^{k+1}/Δt)+Δt^{q})。值得强调的是,误差常数不具指数μ^{-1}依赖性。

英文摘要:

We introduce in this paper the numerical analysis of high order both in time and space Lagrange-Galerkin methods for the conservative formulation of the advection-diffusion equation. As time discretization scheme we consider the Backward Differentiation Formulas up to order $q=5$. The development and analysis of the methods are performed in the framework of time evolving finite elements presented in C. M. Elliot and T. Ranner, IMA Journal of Numerical Analysis \textbf{41}, 1696-1845 (2021). The error estimates show through their dependence on the parameters of the equation the existence of different regimes in the behavior of the numerical solution; namely, in the diffusive regime, that is, when the diffusion parameter $μ$ is large, the error is $O(h^{k+1}+Δt^{q})$, whereas in the advective regime, $μ\ll 1$, the convergence is $O(\min (h^{k},\frac{h^{k+1} }{Δt})+Δt^{q})$. It is worth remarking that the error constant does not have exponential $μ^{-1}$ dependence.

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