Simultaneous inversion for a diffusion coefficient and a spatially dependent source term in the SFADE

This paper deals with an inverse problem of determining a diffusion coefficient and a spatially dependent source term simultaneously in one-dimensional (1-D) space fractional advection-diffusion equation with final observations using the optimal perturbation regularization algorithm. An implicit fin...

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Bibliographic Details
Published in:Inverse problems in science and engineering Vol. 24; no. 5; pp. 832 - 859
Main Authors: Jia, Xianzheng, Li, Gongsheng, Sun, Chunlong, Du, Dianhu
Format: Journal Article
Language:English
Published: Taylor & Francis 12.06.2016
Subjects:
Algorithms
Diffusion coefficient
finite difference scheme
input-output mapping
inverse problem
Inverse problems
Inversions
Mathematical analysis
Mathematical models
optimal perturbation regularization algorithm
Optimization
Perturbation methods
simultaneous inversion
Space fractional advection-diffusion equation (SFADE)
ISSN:1741-5977, 1741-5985
Online Access:Get full text
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Summary:This paper deals with an inverse problem of determining a diffusion coefficient and a spatially dependent source term simultaneously in one-dimensional (1-D) space fractional advection-diffusion equation with final observations using the optimal perturbation regularization algorithm. An implicit finite difference scheme for solving the forward problem is set forth, and a fine estimation to the spectrum radius of the coefficient matrix of the difference scheme is given with which unconditional stability and convergence are proved. The simultaneous inversion problem is transformed to a minimization problem, and existence of solution to the minimum problem is proved by continuity of the input-output mapping. The optimal perturbation algorithm is introduced to solve the inverse problem, and numerical inversions are performed with the source function taking on different forms and the diffusion coefficient taking on different values, respectively. The inversion solutions give good approximations to the exact solutions demonstrating that the optimal perturbation algorithm with the Sigmoid-type regularization parameter is efficient for the simultaneous inversion problem in the space fractional diffusion equation.
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ISSN:1741-5977
1741-5985
DOI:10.1080/17415977.2015.1082130