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Roughness decomposition and effects on fluid flow in single 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, Land and Water Resources Engineering.
2014 (English)In: ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014, International Society for Rock Mechanics , 2014, 457-465 p.Conference paper (Refereed)Text
Abstract [en]

The rock fractures usually consist of surfaces with different orders or scales of roughness, which have critical effects on the fluid flow behavior inside the fractures. In this paper, a two dimensional representative single rock fracture model was built, based on a laser scanned data of rock surface of granite. The surfaces roughness of the fracture was then quantitively decomposed into several levels of surface roughness by applying the wavelet analysis. A self-developed Finite Volume Method solver was then applied to solve the Navier-Stokes equations for numerical modelling of fluid flow in the fracture models formatted with four levels of decomposed roughness, respectively, with different Reynolds numbers varying from 0.001 to 1000.0. Then, the features of velocity profiles and the effective hydraulic apertures at each level of rough fractures decomposition and Reynolds numbers were calculated and analyzed. The results show that when the Reynolds number is small (less than 10.0), the effective hydraulic aperture slightly increase nearly linearly with the decomposed roughness levels. When the Reynolds number is large, the effective hydraulic apertures decrease dramatically, and the non-linear flow behaviors represented by expansion of the eddy flow regions caused by roughness: The larger extent of high-frequency roughness, the more obvious and complicate eddy flow regions yielded.

Place, publisher, year, edition, pages
International Society for Rock Mechanics , 2014. 457-465 p.
Keyword [en]
Effective hydraulic aperture, Navier-stokes equations, Rock fracture, Roughness decomposition, Wavelet analysis, Finite volume method, Flow of fluids, Fluid dynamics, Fracture, Numerical methods, Reynolds number, Rock mechanics, Rocks, Surface roughness, Viscous flow, Wavelet decomposition, Critical effects, High frequency HF, Nonlinear flow, Rock fractures, Rough fractures, Roughness level, Velocity profiles, Navier Stokes equations
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-187584ScopusID: 2-s2.0-84962468694ISBN: 9784907430030OAI: oai:DiVA.org:kth-187584DiVA: diva2:937151
Conference
8th Asian Rock Mechanics Symposium, ARMS 2014, 14 October 2014 through 16 October 2014
Note

QC 20160615

Available from: 2016-06-15 Created: 2016-05-25 Last updated: 2016-06-15Bibliographically approved

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Cvetkovic, VladimirJing, Lanru
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