Decoupled and multiphysics models for non-isothermal compositional two-phase flow in Porous Media
J. Fritz 1, B. Elemisch 1, R. Helmig 11 Institute of Hydraulic Engineering, Dept. of Hydromechanics and Modeling of Hydrosystems, Universitat Stuttgart, Stuttgart, German
Received by the editors April 9, 2009 and, in revised form, July 25, 2009.
A new multiphysics model for two-phase compositional flow is presented. It is designed to fit the level of model complexity to that of the flow and transport processes taking place in a given region of the domain. Thus, the model domain is divided into a subdomain which accounts for two-phase compositional processes and another in which single-phase transport is described. A coupling of the simple and complex equations gives rise to an efficient model. Special interest is placed in the discretization of the two-phase compositional model in a finite-volume context and an IMPES time scheme with decoupled pressure and transport equations. For optimal subdomain determination, an easy-to-handle, adaptive scheme is presented. The practical usability is demonstrated on a real live problem from carbon dioxide sequestration.AMS subject classifications: 76S05, 76T30
Key words: Multiphysics, domain decomposition, multiphase flow, compositional, sequential, decoupled formulation.