Ritz-Approximation Method for Solving Variable-Order Fractional Mobile-Immobile Advection-Dispersion Equations

Sheykhi, Sommayeh; Matinfar, Mashallah; Arab Firoozjaee, Mohammad

doi:10.30473/coam.2025.72692.1267

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	Ritz-Approximation Method for Solving Variable-Order Fractional Mobile-Immobile Advection-Dispersion Equations
Control and Optimization in Applied Mathematics
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 09 آبان 1404 اصل مقاله (1.25 M)
نوع مقاله: Research Article
شناسه دیجیتال (DOI): 10.30473/coam.2025.72692.1267
نویسندگان
Sommayeh Sheykhi¹؛ Mashallah Matinfar¹؛ Mohammad Arab Firoozjaee^* ²
¹Department of Mathematics‎, ‎University of Mazandaran‎, ‎Babolsar‎, ‎Iran.
²Department of Mathematics‎, ‎University of Science and Technology of Mazandaran‎, ‎Behshahr‎, ‎Iran‎.
چکیده
The advection-dispersion, variable-order differential equations have a vast application in fluid physics and energy systems. ‎In this study, ‎we propose a Ritz-approximation method using shifted Legendre polynomials to construct approximate numerical solutions for these equations‎. ‎The proposed method discretizes the original problem, converting it into a system of nonlinear algebraic equations that can be solved numerically at selected points‎. We discuss ‎the error characteristics of the proposed method‎. ‎For validation‎, ‎the presented examples are compared with exact solutions and with prior results. ‎The results indicate that the proposed method is highly effective‎.‎‎
تازه های تحقیق
Introduces a Ritz-approximation numerical method using Shifted Legendre Polynomials (SLPs) to solve advection-dispersion equations with variable-order fractional operators in a mobile-immobile framework (VOF). Demonstrates discretization of the governing problem into a small, tractable system of nonlinear algebraic equations, enabling efficient numerical solution at selected collocation/basis points. Provides a formal error analysis or discussion of the method’s error characteristics, establishing accuracy considerations for the proposed approach. Validates the method through several numerical examples, comparing results against exact solutions and prior methods to demonstrate accuracy and effectiveness. Establishes a flexible framework extendable to other variable-order fractional operators and/or alternative basis function sets beyond SLPs.
کلیدواژه‌ها
Caputo fractional derivative؛ Mobile-immobile advection-dispersion؛ Polynomial basis functions؛ Time variable fractional order؛ Satisfiers function

مراجع
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Ritz-Approximation Method for Solving Variable-Order Fractional Mobile-Immobile Advection-Dispersion Equations