Journal
FRACTIONAL CALCULUS AND APPLIED ANALYSIS
Volume 24, Issue 4, Pages 1112-1129Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/fca-2021-0048
Keywords
space-fractional backward diffusion problem; ill-posed problem; regularization; convergence estimate
Funding
- Vietnam National University-Ho Chi Minh City (VNU-HCM) [B2021-18-02]
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This paper investigates a backward problem for a nonlinear space-fractional diffusion equation with temporally dependent thermal conductivity, showing that the problem is severely ill-posed. By constructing a regularized solution using Fourier transform and a filter function, convergence estimates are explicitly derived for the case of a local Lipschitz reaction term. Special cases of the regularized solution are also presented, extending earlier works on the space-fractional backward diffusion problem.
This paper concerns a backward problem for a nonlinear space-fractional diffusion equation with temporally dependent thermal conductivity. Such a problem is obtained from the classical diffusion equation by replacing the second-order space derivative with a Riesz-Feller derivative of order alpha is an element of (0, 2), which is usually used to model the anomalous diffusion. We show that the problem is severely ill-posed. Using the Fourier transform and a filter function, we construct a regularized solution from the data given inexactly and explicitly derive the convergence estimate in the case of the local Lipschitz reaction term. Special cases of the regularized solution are also presented. These results extend some earlier works on the space-fractional backward diffusion problem.
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