Abstract
A method of fundamental solutions (MFS) is proposed and analyzed for the ill-posed problem of finding the wave motion from given lateral Cauchy data in annular domains. A finite difference scheme, known as the Houbolt method, is applied for the time-discretisation rendering a sequence of elliptic systems corresponding to the number of time steps. The solution of the elliptic problems is sought as a linear combination of elements in what is known as a fundamental sequence with source points placed outside of the solution domain. Collocating on the boundary part where Cauchy data is given, a sequence of linear equations is obtained for finding the coefficients in the MFS approximation. Tikhonov regularization is employed to generate a stable solution to the obtained systems of linear equations. It is outlined that the elements in the fundamental sequence constitute a linearly independent and dense set on the boundary of the solution domain in the \(L_2\)-sense. Numerical results both in two and three-dimensional domains confirm the applicability of the proposed strategy for the considered lateral Cauchy problem for the wave equation both for exact and noisy data.
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This article is part of the section “Computational Approaches” edited by Siddhartha Mishra.
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Borachok, I., Chapko, R. & Johansson, B.T. A method of fundamental solutions with time-discretisation for wave motion from lateral Cauchy data. Partial Differ. Equ. Appl. 3, 37 (2022). https://doi.org/10.1007/s42985-022-00177-0
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DOI: https://doi.org/10.1007/s42985-022-00177-0
Keywords
- Cauchy problem
- Heat equation
- Houbolt method
- Inverse problem
- L-curve rule
- Method of fundamental solutions
- Tikhonov regularization
- Wave equation