Int. J. Numer. Anal. Mod., 9 (2012), pp. 17-28.


Decoupled and multiphysics models for non-isothermal compositional two-phase flow in Porous Media

J. Fritz 1, B. Elemisch 1, R. Helmig 1

1 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.
Abstract

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.
 

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