Fomulations of two phase liquid gas compositional Darcy flows with phase transitions

Roland Masson (1, 2) , Laurent Trenty (3) , Yumeng Zhang (1)

1 LJAD - Laboratoire Jean Alexandre Dieudonné
2 COFFEE - COmplex Flows For Energy and Environment
3 ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs

In this article, three formulations of two phase compositional Darcy flows taking into account phase transitions are compared. The first formulation is the so called natural variable formulation commonly used in reservoir simulation, the second uses the phase pressures, saturations and component fugacities as main unknowns, and the third is an extension to general compositional two phase flows of the pressure pressure formulation. The three formulations are shown to lead to equivalent definitions of the phase transitions for our gas liquid thermodynamical model. Then, they are compared numerically in terms of solution and convergence of the Newton type non linear solver on several 1D and 3D test cases including gas appearance and liquid disappearance. The 3D discretization is based on the Vertex Approximate Gradient (VAG) scheme and takes into account discontinuous capillary pressures.

Mots clés: Darcy flow; phase transitions; finite volume

Domaines: Analyse numérique [math.NA]

Roland Masson, Laurent Trenty, Yumeng Zhang. Fomulations of two phase liquid gas compositional Darcy flows with phase transitions. 2013. ⟨hal-00910366v1⟩