Numer Algor https://doi.org/10.1007/s11075-018-0550-y ORIGINAL PAPER A spectral method for an elliptic equation with a nonlinear Neumann boundary condition 1 2 2 Kendall Atkinson · David Chien · Olaf Hansen Received: 19 February 2018 / Accepted: 14 May 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018 d d Abstract Let be an open region in R , d ≥ 2, that is diffeomorphic to B . Consider solving −u + γu = 0on with the Neumann boundary condition ∂u = b (·,u) over ∂. The function b is a nonlinear function of u. The problem is ∂n reformulated in a weak form, and then a spectral Galerkin method is used to create a sequence of finite dimensional nonlinear problems. An error analysis shows that under suitable assumptions, the solutions of the finite dimensional problems con- verge to those of the original problem. To carry out the error analysis, the original problem and the spectral method is converted to a nonlinear integral equation over 1/2 H () , and the reformulation is analyzed using tools for solving nonlinear inte- gral equations. Numerical examples are given to illustrate the method. In our error analysis, we assume the
Numerical Algorithms – Springer Journals
Published: May 29, 2018
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