数学
离散化
趋同(经济学)
分数阶微积分
扩散方程
理论(学习稳定性)
规范(哲学)
有限差分
有限差分法
应用数学
收敛速度
方案(数学)
数学分析
基函数
有限差分格式
物质衍生物
有限元法
扩散
计算机科学
钥匙(锁)
热力学
机器学习
物理
经济
经济增长
经济
计算机安全
法学
政治学
服务(商务)
作者
Libin Liu,Lei Xu,Yong Zhang
标识
DOI:10.1016/j.matcom.2023.02.007
摘要
This paper is concerned with a finite difference scheme on a new modified graded mesh for a time fractional diffusion equation with a Caputo fractional derivative of order α∈(0,1). At first, the construction and some basic properties of this new modified graded mesh are investigated and on its basis the L1 scheme is applied to approximate the Caputo derivative. Meanwhile, the standard center finite difference scheme on a uniform mesh is used to discretize the diffusion term. Then, stability and convergence of the proposed scheme in the maximum norm are proved. The convergence result shows that on this modified graded mesh one attains an optimal 2−α rate for the L1 scheme. Finally, the presented theoretical results are supported by some numerical experiments.
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