HAL : hal-00319836, version 1

arXiv : 0809.1558

Fiche détaillée

Récupérer au format BibTeX - EndNote - TEI - RefWorks -

Mass conservative BDF-discontinuous Galerkin/explicit finite volume schemes for coupling subsurface and overland flows

Pierre Sochala 1, Alexandre Ern 1, Serge Piperno (  Auteur correspondant ) 1

(09/09/2008)

Robust and accurate schemes are designed to simulate the coupling between subsurface and overland flows. The coupling conditions at the interface enforce the continuity of both the normal flux and the pressure. Richards' equation governing the subsurface flow is discretized using a Backward Differentiation Formula and a symmetric interior penalty Discontinuous Galerkin method. The kinematic wave equation governing the overland flow is discretized using a Godunov scheme. Both schemes individually are mass conservative and can be used within single-step or multi-step coupling algorithms that ensure overall mass conservation owing to a specific design of the interface fluxes in the multi-step case. Numerical results are presented to illustrate the performances of the proposed algorithms.

1 :	Centre d'Enseignement et de Recherche en Mathématiques et Calcul Scientifique (CERMICS)
	Ecole des Ponts ParisTech

Domaine

:

Mathématiques/Analyse numérique

Mots Clés : surface-subsurface coupled flows – Richards' equation – variably saturated porous medium – kinematic wave equation – Discontinuous Galerkin method – unstructured mesh

hal-00319836, version 1

http://hal.archives-ouvertes.fr/hal-00319836

oai:hal.archives-ouvertes.fr:hal-00319836

Contributeur : Serge Piperno <>

Soumis le : Mardi 9 Septembre 2008, 15:49:54

Dernière modification le : Mardi 9 Septembre 2008, 15:52:56