Efficient spatial second-/fourth-order finite difference ADI methods for multi-dimensional variable-order time-fractional diffusion equations

2021 ◽  
Vol 47 (4) ◽  
Author(s):  
Hongfei Fu ◽  
Chen Zhu ◽  
Xueting Liang ◽  
Bingyin Zhang
Keyword(s):  
Finite Difference ◽  
Fourth Order ◽  
Fractional Diffusion ◽  
Diffusion Equations ◽  
Variable Order ◽  
Fractional Diffusion Equations ◽  
Adi Methods ◽  
Dimensional Variable

An Efficient Operational Matrix Technique for Multidimensional Variable-Order Time Fractional Diffusion Equations

2016 ◽  
Vol 11 (6) ◽  
Author(s):  
M. A. Zaky ◽  
S. S. Ezz-Eldien ◽  
E. H. Doha ◽  
J. A. Tenreiro Machado ◽  
A. H. Bhrawy
Keyword(s):  
Present Method ◽  
Operational Matrix ◽  
Solution Process ◽  
Fractional Diffusion ◽  
Diffusion Equations ◽  
Variable Order ◽  
Algebraic Equations ◽  
Global Approximation ◽  
Fractional Diffusion Equations ◽  
Accurate Numerical Algorithm

This paper derives a new operational matrix of the variable-order (VO) time fractional partial derivative involved in anomalous diffusion for shifted Chebyshev polynomials. We then develop an accurate numerical algorithm to solve the 1 + 1 and 2 + 1 VO and constant-order fractional diffusion equation with Dirichlet conditions. The contraction of the present method is based on shifted Chebyshev collocation procedure in combination with the derived shifted Chebyshev operational matrix. The main advantage of the proposed method is to investigate a global approximation for spatial and temporal discretizations, and it reduces such problems to those of solving a system of algebraic equations, which greatly simplifies the solution process. In addition, we analyze the convergence of the present method graphically. Finally, comparisons between the algorithm derived in this paper and the existing algorithms are given, which show that our numerical schemes exhibit better performances than the existing ones.

scholarly journals On Time-Fractional Diffusion Equations with Space-Dependent Variable Order

2018 ◽  
Vol 19 (12) ◽  
pp. 3855-3881 ◽  
Author(s):  
Yavar Kian ◽  
Eric Soccorsi ◽  
Masahiro Yamamoto
Keyword(s):  
Fractional Diffusion ◽  
Diffusion Equations ◽  
Variable Order ◽  
Fractional Diffusion Equations
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