Volume 57, Number 4, July-August 2023
|Page(s)||2193 - 2225|
|Published online||03 July 2023|
Cost-optimal adaptive iterative linearized FEM for semilinear elliptic PDEs
Université de Pau et des Pays de l’Adour, IPRA-LMAP, Avenue de l’Université, BP 1155, 64013 PAU Cedex, France
2 TU Wien, Institute of Analysis and Scientific Computing, Wiedner Hauptstr. 8–10/E101/4, 1040 Vienna, Austria
* Corresponding author: firstname.lastname@example.org
Accepted: 23 April 2023
We consider scalar semilinear elliptic PDEs where the nonlinearity is strongly monotone, but only locally Lipschitz continuous. We formulate an adaptive iterative linearized finite element method (AILFEM) which steers the local mesh refinement as well as the iterative linearization of the arising nonlinear discrete equations. To this end, we employ a damped Zarantonello iteration so that, in each step of the algorithm, only a linear Poisson-type equation has to be solved. We prove that the proposed AILFEM strategy guarantees convergence with optimal rates, where rates are understood with respect to the overall computational complexity (i.e., the computational time). Moreover, we formulate and test an adaptive algorithm where also the damping parameter of the Zarantonello iteration is adaptively adjusted. Numerical experiments underline the theoretical findings.
Mathematics Subject Classification: 65N30 / 65N50 / 65N15 / 65Y20 / 41A25
Key words: Adaptive iterative linearized finite element method / Semilinear PDEs / Iterative solver / A posteriori error estimation / Convergence / Optimal convergence rates / Cost-optimality
© The authors. Published by EDP Sciences, SMAI 2023
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