From the pore scale to the lab scale: 3-D lab experiment and numerical simulation of drainage in heterogeneous porous media |
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| Authors: | A. Papafotiou,R. Helmig,J. Schaap,P. Lehmann,A. Kaestner,H. Flü hler,I. Neuweiler,R. Hassanein,B. Ahrenholz,J. Tö lke,A. Peters,W. Durner |
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| Affiliation: | 1. Institut für Wasserbau, Lehrstuhl für Hydromechanik und Hydrosystemmodellierung, Universität Stuttgart, Pfaffenwaldring 61, 70569 Stuttgart, Germany;2. Institute of Terrestrial Ecology, Soil Physics Group, ETH Zürich, Universitätstrasse 16, ETH Zentrum CHN, CH-8092 Zürich, Switzerland;3. Paul Scherrer Institute, 5232 Villingen PSI, Switzerland;4. Institut für Computeranwendungen im Bauingenieurwesen, Technische Universität Carolo-Wilhelmina zu Braunschweig, Pockelsstrasse 3, 38106 Braunschweig, Germany;5. Institut für Geoökologie, Technische Universität Braunschweig, Langer Kamp 19c, 38106 Braunschweig, Germany |
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| Abstract: | A well-controlled 3-D experiment with pre-defined block heterogeneities is conducted, where neutron tomography is used to map 3-D water distribution after two successive drainage steps. The material and hydraulic properties of the two sands are first measured in the laboratory with multistep outflow experiments. Additionally, the pore structure of the sands is acquired by means of image analysis of synchrotron tomography data and the structure is used for pore-scale simulation of one- and two-phase flow with Lattice-Boltzmann methods. This gives us another set of material and hydraulic parameters of the sands. The two sets of hydraulic properties (from the lab scale and from the pore scale) are then used in numerical simulations of the 3-D experiment. |
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| Keywords: | 3-D experiment Neutron tomography Heterogeneity Two-phase flow Numerical simulation Pore scale Lab scale Lattice-Boltzmann |
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