Numerical study of generalized modified Caputo fractional differential equations

Abstract

In the present study, we introduce two new operational matrices of fractional Legendre function vectors in the sense of generalized Caputo-type fractional derivative and generalized Riemann–Liouville-type fractional integral operators. The derivative and integral operational matrices developed in the sense of Caputo and Riemann–Liouville operators are special cases of our proposed generalized operational matrices for $\text{β},\eta =1$. Then, we present a numerical method that is dependent on the generalized derivative and integral operational matrices. The applicability and accuracy of the presented method is tested by solving various problems and then comparing the results obtained otherwise by using various numerical methods including spectral collocation methods, spectral Tau method, stochastic approach, and Taylor matrix approach. Moreover, our presented method transforms the problems into Sylvester equations that are easily solvable by using MATLAB or MATHEMATICA. We believe that the newly derived generalized operational matrices and the presented method are expected to be further used to formulate and simulate many generalized Caputo-type fractional models.

Keywords:

• Generalized operational matrices
• generalized fractional derivative in Caputo sense
• Sylvester equations
• orthogonal polynomials
• Legendre function vectors

2022 AMS Subject Classifications:

• 65L05
• 26A33
• 35R11

Acknowledgments

The authors would like to thank both anonymous referees and the handling editor for many useful comments and suggestions, leading to a substantial improvement of the presentation of this article.

Disclosure statement

No potential conflict of interest was reported by the author(s).