arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.06260math.NAcs.NA
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变系数时间分数阶对流扩散反应方程的两层四阶近似

A Two-Level Fourth-Order Approach For Time-Fractional Convection-Diffusion-Reaction Equation With Variable Coefficients

Eric Ngondiep

摘要:

在适当的初始条件和边界条件下,发展了一种求解时间分数阶变系数对流扩散反应方程的两层四阶格式。在$L^{\infty}(0,T;L^{2})$ -范数意义下,研究了新方法的基本性质,并对所提出的数值格式的稳定性和误差估计进行了深入分析.理论证明该方法是无条件稳定的,收敛阶为$O(k^{2-\fracλ{2}}+h^{4})$,其中$k$和$h$分别为时间步长和网格步长,$λ\in(0,1)$ .这一结果表明,两个层次的四阶技术是更有效的,比一个大类的数值技术广泛研究的文献中所考虑的问题。数值结果验证了算法的无条件稳定性和收敛速度。

英文摘要:

This paper develops a two-level fourth-order scheme for solving time-fractional convection-diffusion-reaction equation with variable coefficients subjected to suitable initial and boundary conditions. The basis properties of the new approach are investigated and both stability and error estimates of the proposed numerical scheme are deeply analyzed in the $L^{\infty}(0,T;L^{2})$-norm. The theory indicates that the method is unconditionally stable with convergence of order $O(k^{2-\fracλ{2}}+h^{4})$, where $k$ and $h$ are time step and mesh size, respectively, and $λ\in(0,1)$. This result suggests that the two-level fourth-order technique is more efficient than a large class of numerical techniques widely studied in the literature for the considered problem. Some numerical evidences are provided to verify the unconditional stability and convergence rate of the proposed algorithm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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