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arXiv 2206.04033math.NAcs.NA
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广义Caputo导数和广义分数阶对流-扩散方程的高阶逼近

High-order approximation to generalized Caputo derivatives and generalized fractional advection-diffusion equations

Sarita Kumari, Rajesh K. Pandey, R. P. Agarwal

摘要:

本文考虑了一种基于三次插值公式的高阶时步格式来逼近广义Caputo分数阶导数(GCFD)。该方案的收敛阶是$(4-α)$,其中$α~(0<α<1)$是GCFD的阶。还提供了局部截断误差。然后,我们利用所发展的格式建立了求解广义分数阶对流-扩散方程Dirichlet边界条件的差分格式。进一步讨论了该差分格式的稳定性和收敛性。数值例子来检验理论索赔。数值分析了差分格式的收敛阶,时间上为$(4-α)$,空间上为二阶。

英文摘要:

In this article, a high-order time-stepping scheme based on the cubic interpolation formula is considered to approximate the generalized Caputo fractional derivative (GCFD). Convergence order for this scheme is $(4-α)$, where $α~(0<α<1)$ is the order of the GCFD. The local truncation error is also provided. Then, we adopt the developed scheme to establish a difference scheme for the solution of generalized fractional advection-diffusion equation with Dirichlet boundary conditions. Furthermore, we discuss about the stability and convergence of the difference scheme. Numerical examples are presented to examine the theoretical claims. The convergence order of the difference scheme is analyzed numerically, which is $(4-α)$ in time and second-order in space.

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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