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Research - Dept. of Hydromechanics and Modelling of Hydrosystems

Modeling and analysis of the movement of fluid-fluid interfaces in porous media coupled with free flow
Project manager:Prof. Dr.-Ing. Rainer Helmig
Deputy:apl. Prof. Dr.-Ing. Holger Class, Dr. rer.nat. Insa Neuweiler
Research assistants:Dr.-Ing. Klaus Mosthaf
Dipl.-Ing. Thomas Fetzer
Duration:1.11.2008 - 28.2.2015
Funding:Deutsche Forschungsgemeinschaft (DFG), externer Link www.dfg.de, subproject SP2 in the International Research Unit: Multi-Scale Interfaces in Unsaturated Soil - Towards quantitative prediction of terrestrial mass and energy fluxes (MUSIS)
Project Partners:Leibniz Universität Hannover, Technische Universität Braunschweig, Forschungszentrum Jülich, ETH Zürich, UFZ Halle Leipzig
Comments:Teilprojekt der internationalen DFG-Forschergruppe "Multi-Scale Interfaces in Unsaturated Soil - Towards quantitative prediction of terrestrial mass and energy fluxes", externer Link www.musis.uni-hannover.de

This project is part of the research area:
Model coupling and complex structures

Poster:Poster (PDF)
Publications: Link

Abstract:

In this subproject, we focus on the modeling and interpretation of evaporation from porous media under the influence of atmospheric processes, such as wind and radiation. Within the first project phase, we have developed an REV-scale model concept which allows the coupling of a laminar single-phase free flow and a two-phase porous-medium flow under non-isothermal, compositional flow conditions. An important goal is to extend this concept for turbulent flow conditions in the atmospheric part of the model domain and to include further processes like radiation and infiltration. In this context, different kinds of interfaces may have a strong impact on the transfer fluxes and have to be considered: Fluid-fluid interfaces, interfaces between different porous materials and the interface between unsaturated soil and atmosphere. The vision is to develop a model which can reproduce the complex interaction at these interfaces in detail and which allows the simulation and analysis of sequences of infiltration and evaporation. In this context, the effects of hysteresis at heterogeneous structures and of dynamic capillary pressure on the transfer fluxes and the fluid front evolution will be explored. The model will allow to determine and extend the limits of common state-of-the-art models and to improve the predictability of evaporation rates. Furthermore, different scenarios will be analyzed with respect to the required model complexity aiming at a model reduction and an improved modeling on the field scale.