Convergence of an adaptive Kačanov FEM for quasi-linear problems

Details Convergence of an adaptive Kačanov FEM for quasi-linear problems Convergence of an adaptive Kačanov FEM for quasi-linear problems

2010-06-16

arxiv.org/abs/1006.3319v1

Mathematics

Numerical Analysis

Scientific paper

We design an adaptive finite element method to approximate the solutions of quasi-linear elliptic problems. The algorithm is based on a Ka\v{c}anov iteration and a mesh adaptation step is performed after each linear solve. The method is thus \emph{inexact} because we do not solve the discrete nonlinear problems exactly, but rather perform one iteration of a fixed point method (Ka\v{c}anov), using the approximation of the previous mesh as an initial guess. The convergence of the method is proved for any \emph{reasonable} marking strategy and starting from any initial mesh. We conclude with some numerical experiments that illustrate the theory.

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