WIAS Preprint No. 1222, (2007)

Energy estimates for continuous and discretized electro-reaction-diffusion systems



Authors

  • Glitzky, Annegret
  • Gärtner, Klaus

2010 Mathematics Subject Classification

  • 35B40 35K57 78A35 35R05 65M12

Keywords

  • Reaction-diffusion systems, drift-diffusion processes, motion of charged particles, energy estimates, thermodynamic equilibria, asymptotic behaviour, time and space discretization

Abstract

We consider electro-reaction-diffusion systems consisting of continuity equations for a finite number of species coupled with a Poisson equation. We take into account heterostructures, anisotropic materials and rather general statistic relations. We investigate thermodynamic equilibria and prove for solutions to the evolution system the monotone and exponential decay of the free energy to its equilibrium value. Here the essential idea is an estimate of the free energy by the dissipation rate which is proved indirectly. The same properties are shown for an implicit time discretized version of the problem. Moreover, we provide a space discretized scheme for the electro-reaction-diffusion system which is dissipative (the free energy decays monotonously). On a fixed grid we use for each species different Voronoi boxes which are defined with respect to the anisotropy matrix occurring in the flux term of this species.

Appeared in

  • Nonlinear Anal., 70 (2009) pp. 788--805.

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