Details
| Original language | English |
|---|---|
| Pages (from-to) | 1253-1268 |
| Number of pages | 16 |
| Journal | Advances in water resources |
| Volume | 31 |
| Issue number | 9 |
| Publication status | Published - 4 Oct 2007 |
| Externally published | Yes |
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. The paper discusses critical aspects and benchmarks for experimental measurements of 3-D water distribution in heterogeneous porous media. Additionally, we discuss possibilities as well as difficulties and limitations in the determination of hydraulic properties of materials using two conceptually different approaches (pore scale and lab scale). We then test with the numerical simulations how good can predictions on flow and water content in structured media be when using these state-of-the-art methods for the determination of hydraulic properties. Based on the numerical simulations, we discuss which parameters are more difficult to predict and which of the two approaches (lab scale or pore scale) enables better predictions.
Keywords
- 3-D experiment, Heterogeneity, Lab scale, Lattice-Boltzmann, Neutron tomography, Numerical simulation, Pore scale, Two-phase flow
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
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In: Advances in water resources, Vol. 31, No. 9, 04.10.2007, p. 1253-1268.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - From the pore scale to the lab scale
T2 - 3-D lab experiment and numerical simulation of drainage in heterogeneous porous media
AU - Papafotiou, A.
AU - Helmig, R.
AU - Schaap, J.
AU - Lehmann, P.
AU - Kaestner, A.
AU - Flühler, H.
AU - Neuweiler, Insa
AU - Hassanein, R.
AU - Ahrenholz, B.
AU - Tölke, J.
AU - Peters, A.
AU - Durner, W.
N1 - Funding information: This work was supported by the Deutsche Forschungsgemeinschaft (DFG) within the project First-principle-based Modelling of Transport in Unsaturated Media under the Grant He 2531/5-1.
PY - 2007/10/4
Y1 - 2007/10/4
N2 - 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. The paper discusses critical aspects and benchmarks for experimental measurements of 3-D water distribution in heterogeneous porous media. Additionally, we discuss possibilities as well as difficulties and limitations in the determination of hydraulic properties of materials using two conceptually different approaches (pore scale and lab scale). We then test with the numerical simulations how good can predictions on flow and water content in structured media be when using these state-of-the-art methods for the determination of hydraulic properties. Based on the numerical simulations, we discuss which parameters are more difficult to predict and which of the two approaches (lab scale or pore scale) enables better predictions.
AB - 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. The paper discusses critical aspects and benchmarks for experimental measurements of 3-D water distribution in heterogeneous porous media. Additionally, we discuss possibilities as well as difficulties and limitations in the determination of hydraulic properties of materials using two conceptually different approaches (pore scale and lab scale). We then test with the numerical simulations how good can predictions on flow and water content in structured media be when using these state-of-the-art methods for the determination of hydraulic properties. Based on the numerical simulations, we discuss which parameters are more difficult to predict and which of the two approaches (lab scale or pore scale) enables better predictions.
KW - 3-D experiment
KW - Heterogeneity
KW - Lab scale
KW - Lattice-Boltzmann
KW - Neutron tomography
KW - Numerical simulation
KW - Pore scale
KW - Two-phase flow
UR - http://www.scopus.com/inward/record.url?scp=49449106925&partnerID=8YFLogxK
U2 - 10.1016/j.advwatres.2007.09.006
DO - 10.1016/j.advwatres.2007.09.006
M3 - Article
AN - SCOPUS:49449106925
VL - 31
SP - 1253
EP - 1268
JO - Advances in water resources
JF - Advances in water resources
SN - 0309-1708
IS - 9
ER -