AIMS Mathematics, 2020, 5(6): 6211-6220. doi: 10.3934/math.2020399

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The modified quadrature method for Laplace equation with nonlinear boundary conditions

School of Mathematics, Chengdu Normal University, Chengdu, Sichuan, 611130, China

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Here, the numerical solutions for Laplace equation with nonlinear boundary conditions is studied. Based on the potential theory, the problem can be converted into a nonlinear boundary integral equation. The modified quadrature method is presented for solving the nonlinear equation, which possesses high accuracy order $O(h^3)$ and low computing complexities. A nonlinear system is obtained by discretizing the nonlinear equation and the convergence of numerical solutions is proved by the theory of compact operators. Moreover, in order to solve the nonlinear system, the Newton iteration is provided by using the Ostrowski fixed point theorem. Finally, numerical examples support the theoretical results.
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