Volume 50, Number 3, May-June 2016
Special Issue – Polyhedral discretization for PDE
|Page(s)||749 - 781|
|Published online||23 May 2016|
Gradient schemes: Generic tools for the numerical analysis of diffusion equations
School of Mathematical Sciences, Monash University,
2 Laboratoire d’Analyse et de Mathématiques Appliquées, Université Paris-Est, UMR 8050, 5 boulevard Descartes, Champs-sur-Marne, 77454 Marne-la-Vallée cedex 2, France
3 Laboratoire d’Analyse Topologie et Probabilités, UMR 6632, Université d’Aix-Marseille, 39 rue Joliot Curie, 13453 Marseille, France Raphaele
Received: 15 April 2015
Revised: 5 October 2015
The gradient scheme framework is based on a small number of properties and encompasses a large number of numerical methods for diffusion models. We recall these properties and develop some new generic tools associated with the gradient scheme framework. These tools enable us to prove that classical schemes are indeed gradient schemes, and allow us to perform a complete and generic study of the well-known (but rarely well-studied) mass lumping process. They also allow an easy check of the mathematical properties of new schemes, by developing a generic process for eliminating unknowns via barycentric condensation, and by designing a concept of discrete functional analysis toolbox for schemes based on polytopal meshes.
Mathematics Subject Classification: 65M08 / 65M12 / 65M60 / 65N08 / 65N12 / 65N15 / 65N30
Key words: Gradient scheme / gradient discretisation / numerical scheme / diffusion equations / convergence analysis / discrete functional analysis
© EDP Sciences, SMAI 2016
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