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Research - Dept. of Hydromechanics and Modelling of Hydrosystems

Multiphysics modelling of two (three) phase flow with capillary pressure
Project manager:Prof. Dr.-Ing. Rainer Helmig, apl. Prof. Dr. rer. nat. Bernd Flemisch, M.Sc.
Research assistants:Dipl.-Ing. Benjamin Faigle
Duration:1.4.2010 - 31.3.2013
Funding:International Research Training Group NUPUS
Project Partners:Prof. Ivar Aavatsmark, CIPR Bergen (Norway)
Comments:Fortsetzung von folgendem Projekt

This project is part of the research area:
Multi-scale- and multi-physics-modelling

Publications: Link

Abstract:

Many technical and environmental applications of multiphase flow in porous media, such as subsurface CO2 sequestration, enhanced oil recovery or remediation of hazardous spills in the groundwater, require a very large simulation domain and occur on large timescales. In most cases, however, complex flow regimes occur only on small subdomains of the whole domain of interest. Inside these subdomains, the quality of simulations benefit from highly resolved grids as well as from an in-depth description of the physics involved. Outside, in contrast, the grid could still remain coarse and the relevant processes are captured with a simpler physical model. Hence, flexible modeling strategies for multi-phase flow and transport have promising efficiency. Multi-physics concepts adapt the physical complexity of the numerical model locally according to the underlying physical processes. The framework by J. Fritz was extended to consider an even higher physical complexity, such as three-phase systems as well as a principal approach to include capillary effects. In addition, refinement strategies of the underlying grid are sought to capture small scale effects in areas of special interest or to qualitatively improve the simulation results eg. around shock fronts. On "hanging nodes" that evolve from refining a regular grid, we deploy a multipoint-flux approximation to reduce errors caused by the refinement.