Fourth-order difference solvers for nonlinear delayed fractional sub-diffusion equations with variable coefficients

Fourth-order difference solvers for nonlinear delayed fractional sub-diffusion equations with variable coefficients
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变系数非线性延迟分数子扩散方程的四阶差分求解器

DOI:
10.1080/02286203.2017.1358133
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发表时间:
2017-08
影响因子:
3.1
通讯作者:
郑华盛
郑华盛
中科院分区:
--
文献类型:
--
作者:
谢建强;邓定文;郑华盛

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本文建立了非线性时滞分数阶次扩散方程的紧致差分格式。用离散能量法证明了它在L∞范数意义下达到O(2−α)+h4的收敛速度,并且是无条件稳定的。这里,α是分数导数的阶数。此外,还讨论了该求解器对多项时滞分数子扩散方程的推广。最后,数值结果证明了我们的求解器的有效性。
In this paper, a compact difference scheme is established for nonlinear delayed fractional sub-diffusion.equations. By the discrete energy method, it is shown that it achieves the convergence rate of O(\tau^(2−\alpha) + h4).in L∞- norm, and is unconditionally stable. Here, α is the order of fractional derivative. Besides, the extension.of the solver to multi-term time fractional sub-diffusion equations with delays is discussed. Finally,.numerical results demonstrate the effectiveness of our solvers.
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