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1 LMAM - Laboratoire de Mathématiques et Applications de Metz 2 LJLL - Laboratoire Jacques-Louis Lions 3 CaGE - Control And GEometry LJLL - Laboratoire Jacques-Louis Lions, Inria de Paris

Abstract : We establish sharp energy decay rates for a large class of nonlinearly first-order damped systems, and we design discretization schemes that inherit of the same energy decay rates, uniformly with respect to the space and-or time discretization parameters, by adding appropriate numerical viscosity terms. Our main arguments use the optimal-weight convexity method and uniform observability inequalities with respect to the discretization parameters. We establish our results, first in the continuous setting, then for space semi-discrete models, and then for time semi-discrete models. The full discretization is inferred from the previous results. Our results cover, for instance, the Schrödinger equation with nonlinear damping, the nonlinear wave equation, the nonlinear plate equation, as well as certain classes of equations with nonlocal terms.

Keywords : space-time discretization stabilization dissipative systems optimal weight convexity method

Author: Fatiha Alabau-Boussouira - Yannick Privat - Emmanuel Trélat -



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