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Nonlinear damped partial differential equations and their uniform discretizations. (English) Zbl 1364.37155

Summary: 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 then inferred from the previous results, by adapting the ideas to deal with linear systems.
Our results cover, for instance, the Schrödinger equation with nonlinear damping, the nonlinear wave equation, the nonlinear plate equation, the nonlinear transport equation, as well as certain classes of equations with nonlocal terms.

MSC:

37L15 Stability problems for infinite-dimensional dissipative dynamical systems
93D15 Stabilization of systems by feedback
35B35 Stability in context of PDEs
35L60 First-order nonlinear hyperbolic equations
35L70 Second-order nonlinear hyperbolic equations
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