hal-00355212, version 3
On 3D DDFV discretization of gradient and divergence operators. I. Meshing, operators and discrete duality.
(11/03/2011)
Abstract: This work is intended to provide a convenient tool for the mathematical analysis of a particular kind of finite volume approximation which can be used, for instance, in the context of nonlinear and/or anisotropic diffusion operators in 3D. Following the approach developed by F. Hermeline and by K.~Domelevo and P. Omnès in 2D, we consider a ``double'' covering $\Tau$ of a three-dimensional domain by a rather general primal mesh and by a well-chosen ``dual'' mesh. The associated discrete divergence operator $\div^{\ptTau}$ is obtained by the standard finite volume approach. A simple and consistent discrete gradient operator $\grad^\ptTau$ is defined by local affine interpolation that takes into account the geometry of the double mesh. Under mild geometrical constraints on the choice of the dual volumes, we show that $-\div^{\ptTau}$, $\grad^\ptTau$ are linked by the ``discrete duality property'', which is an analogue of the integration-by-parts formula. The primal mesh need not be conformal, and its interfaces can be general polygons. We give several numerical examples for anisotropic linear diffusion problems; good convergence properties are observed. The sequel [3] of this paper will summarize some key discrete functional analysis tools for DDFV schemes and give applications to proving convergence of DDFV schemes for several nonlinear degenerate parabolic PDEs.
- 1:
- CNRS : UMR6623 – Université de Franche-Comté
- 2:
- Universidad de Concepción
- 3:
- CNRS : UMR5251 – Université Sciences et Technologies - Bordeaux I – Université Victor Segalen - Bordeaux II
- 4:
- CNRS : UMR6632 – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III
- 5:
- INRIA – Université Lille I - Sciences et technologies – CNRS : UMR
- Domain : Mathematics/Numerical Analysis
Mathematics/Analysis of PDEs - Keywords : Finite volume approximation – Gradient reconstruction – Discrete gradient – Discrete duality – 3D CeVe-DDFV – Consistency – Anisotropic elliptic problems – General mesh – Non-conformal mesh
- Comment : This is a largely extended version with respect to version 1.
- Available versions : v1 (2009-01-22) v2 (2011-02-21) v3 (2011-03-11)
- hal-00355212, version 3
- http://hal.archives-ouvertes.fr/hal-00355212
- oai:hal.archives-ouvertes.fr:hal-00355212
- From:
- Submitted on: Friday, 11 March 2011 16:38:52
- Updated on: Friday, 11 March 2011 18:27:50



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