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arXiv 2209.00217math.NAcs.NA
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混合型时间分数阶Burgers方程紧差分格式的点态误差估计

Pointwise error estimates of compact difference scheme for mixed-type time-fractional Burgers' equation

Xiangyi Peng, Da Xu, Wenlin Qiu

摘要:

基于发展的非线性四阶算子和降阶方法,对混合型时间分数阶Burgers方程构造了一种新的四阶紧差分格式,其中分数阶导数项采用$L_1$ -离散公式处理,非线性对流项采用非线性紧差分算子离散.然后利用经典的紧致差分公式对空间二阶导数进行逼近,得到全离散的紧差分格式。在$L^{\infty}$ -范数下,通过能量论证和数学归纳法严格证明了算法的收敛性和稳定性.最后,通过数值实验验证了理论分析的正确性.

英文摘要:

In this paper, based on the developed nonlinear fourth-order operator and method of order reduction, a novel fourth-order compact difference scheme is constructed for the mixed-type time-fractional Burgers' equation, from which $L_1$-discretization formula is employed to deal with the terms of fractional derivative, and the nonlinear convection term is discretized by nonlinear compact difference operator. Then a fully discrete compact difference scheme can be established by approximating spatial second-order derivative with classic compact difference formula. The convergence and stability are rigorously proved in the $L^{\infty}$-norm by the energy argument and mathematical induction. Finally, several numerical experiments are provided to verify the theoretical analysis.

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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