Details
| Original language | English |
|---|---|
| Title of host publication | Models - Repositories of Knowledge |
| Pages | 280-285 |
| Number of pages | 6 |
| Publication status | Published - 2012 |
| Event | 8th International Conference on Calibration and Reliability in Groundwater Modeling - Repositories of Knowledge, ModelCARE 2011 - Leipzig, Germany Duration: 18 Sept 2011 → 22 Sept 2011 |
Publication series
| Name | IAHS-AISH Publication |
|---|---|
| Volume | 355 |
| ISSN (Print) | 0144-7815 |
Abstract
The effect of regular orthogonal fracture networks on density dependent free convection is investigated by numerical simulations. Discrete orthogonal fracture networks of different fracture spacing are systematically added to the Horton-Rogers-Lapwood (HRL) problem for free-convective flow in unfractured homogeneous porous rock. The equivalent hydraulic conductivity was preserved when fractures were added. Simulation results suggest that fractures affect free-convective flow if: (i) fracture permeability is more than five orders of magnitude larger than matrix permeability, and if (ii) fracture spacing is large. With decreasing fracture spacing, flow patterns approximate those of the corresponding unfractured HRL problem. Furthermore, a diffusion-only case at low Rayleigh number in homogeneous unfractured rock is regarded. It is shown that adding few fractures with large fracture spacing promotes free convective flow compared to the unfractured case of the same equivalent permeability.
Keywords
- Density, Fractures, Groundwater, HydroGeoSphere, Numerical modelling, Rayleigh
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- General Earth and Planetary Sciences
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Models - Repositories of Knowledge. 2012. p. 280-285 (IAHS-AISH Publication; Vol. 355).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Modes of free convective flow in fractured-porous rock
AU - Vujević, Katharina
AU - Graf, Thomas
PY - 2012
Y1 - 2012
N2 - The effect of regular orthogonal fracture networks on density dependent free convection is investigated by numerical simulations. Discrete orthogonal fracture networks of different fracture spacing are systematically added to the Horton-Rogers-Lapwood (HRL) problem for free-convective flow in unfractured homogeneous porous rock. The equivalent hydraulic conductivity was preserved when fractures were added. Simulation results suggest that fractures affect free-convective flow if: (i) fracture permeability is more than five orders of magnitude larger than matrix permeability, and if (ii) fracture spacing is large. With decreasing fracture spacing, flow patterns approximate those of the corresponding unfractured HRL problem. Furthermore, a diffusion-only case at low Rayleigh number in homogeneous unfractured rock is regarded. It is shown that adding few fractures with large fracture spacing promotes free convective flow compared to the unfractured case of the same equivalent permeability.
AB - The effect of regular orthogonal fracture networks on density dependent free convection is investigated by numerical simulations. Discrete orthogonal fracture networks of different fracture spacing are systematically added to the Horton-Rogers-Lapwood (HRL) problem for free-convective flow in unfractured homogeneous porous rock. The equivalent hydraulic conductivity was preserved when fractures were added. Simulation results suggest that fractures affect free-convective flow if: (i) fracture permeability is more than five orders of magnitude larger than matrix permeability, and if (ii) fracture spacing is large. With decreasing fracture spacing, flow patterns approximate those of the corresponding unfractured HRL problem. Furthermore, a diffusion-only case at low Rayleigh number in homogeneous unfractured rock is regarded. It is shown that adding few fractures with large fracture spacing promotes free convective flow compared to the unfractured case of the same equivalent permeability.
KW - Density
KW - Fractures
KW - Groundwater
KW - HydroGeoSphere
KW - Numerical modelling
KW - Rayleigh
UR - http://www.scopus.com/inward/record.url?scp=84877624953&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84877624953
SN - 9781907161346
T3 - IAHS-AISH Publication
SP - 280
EP - 285
BT - Models - Repositories of Knowledge
T2 - 8th International Conference on Calibration and Reliability in Groundwater Modeling - Repositories of Knowledge, ModelCARE 2011
Y2 - 18 September 2011 through 22 September 2011
ER -