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Shear-enhanced nonlinear flow in rough-walled rock fractures
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
2017 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 97, p. 33-45Article in journal (Refereed) Published
Abstract [en]

Nonlinear flow in 3D rough-walled rock fractures is simulated by solving the Navier-Stokes equations. The emphasis is on the impact of shear-caused aperture changes (variable apertures and asperity contacts) and flow conditions (inertial term) upon nonlinear flow behavior. In order to compare shear effects, two 3D fracture models, with and without shear, were established with identical initial rough-walled surfaces topographies of a realistic rock sample. Five groups of simulations with different inflow boundary conditions of flowrates/Reynolds numbers (Re) were conducted to demonstrate shear-enhanced nonlinearity of flow fields and limitations of local cubic law (LCL) approach. The flow results clearly show channeling flow along the preferential paths, transverse flow around the contact spots, and eddy flows behind contact spots with increasing Re, which cannot be observed in 2D models. The effective transmissivity of the 3D fracture model was calculated from the modeling results of velocity and pressure fields. The results showed that the effective transmissivity is a function of local apertures with important uncertainties even when Re is small (i.e. Re = 0.4 in this study), thus the validity of the transmissivity evaluation using LCL approach for nonlinear flow in 3D rough-walled rock fractures is questionable.

Place, publisher, year, edition, pages
Elsevier Ltd , 2017. Vol. 97, p. 33-45
Keyword [en]
Contact spots, Eddy flow, Effective transmissivity, Nonlinear fracture flow, Rough-walled rock fractures, Shear, Flow fields, Fracture, Navier Stokes equations, Nonlinear equations, Rocks, Shearing, Fracture flow, Rock fractures, Transmissivity, Shear flow, boundary condition, eddy, fracture aperture, Navier-Stokes equations, nonlinearity, Reynolds number, rock mechanics, three-dimensional modeling
National Category
Geophysical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-218825DOI: 10.1016/j.ijrmms.2017.06.001Scopus ID: 2-s2.0-85020782537OAI: oai:DiVA.org:kth-218825DiVA, id: diva2:1175110
Note

QC 20180117

Available from: 2018-01-17 Created: 2018-01-17 Last updated: 2018-01-17Bibliographically approved

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Zou, LiangchaoCvetkovic, Vladimir

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