arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.10596math.NAcs.NAmath.AP
收藏

时间分数阶扩散方程的广义记忆核二阶差分格式

A second order difference scheme for time fractional diffusion equation with generalized memory kernel

Aslanbek Khibiev, Anatoly Alikhanov, Chengming Huang

摘要:

在目前的工作中,我们建立了一个差分模拟的Caputo分数阶导数与广义记忆核($_λ$ L2-1 $_σ$公式)。本文研究了这种差分算子的基本性质,并在此基础上对变系数广义时间分数阶扩散方程构造了时间上二阶近似的差分格式。我们证明了所给格式在网格$L_2$ -范数下的稳定性和收敛性,其收敛速度等于逼近误差的阶。所得结果得到了一些试验问题的数值计算的支持。

英文摘要:

In the current work we build a difference analog of the Caputo fractional derivative with generalized memory kernel ($_λ$L2-1$_σ$ formula). The fundamental features of this difference operator are studied and on its ground some difference schemes generating approximations of the second order in time for the generalized time-fractional diffusion equation with variable coefficients are worked out. We have proved stability and convergence of the given schemes in the grid $L_2$ - norm with the rate equal to the order of the approximation error. The achieved results are supported by the numerical computations performed for some test problems.

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。

↑