Zaouter, Tony and Lasseux, Didier and Prat, Marc
Determination of the transmissivity of a heterogeneous anisotropic fracture in slip flow conditions.
(2019)
Physical Review E, 100 (3). 033115. ISSN 1539-3755
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(Document in English)
PDF (Publisher’s version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 4MB |
Official URL: https://doi.org/10.1103/PhysRevE.100.033115
Abstract
Rough fractures often exhibit a broad spectrum of defect length scales ranging from the microscopic (roughness) scale to a macroscopic one (waviness) and further to the megascopic scale corresponding to the entire fracture. The influence of these multiple scales and their reciprocal interactions are expected to play a significant role on the transport properties at the megascale. Focusing on the pressure-driven slightly compressible gas slip flow, a two-scale method is presented allowing the determination of the global transmissivity of a fracture on the basis of an upscaled Reynolds model. This model is applied on a tessellation of the fracture, each tile being affected by a macroscopic transmissivity tensor which encompasses the microscale transport information as a result of the first upscaling process. Then, the megascale flow problem in this structure, made of a set of tiles characterized by a heterogeneous and anisotropic transmissivity tensor field, is solved using a boundary element method. Numerical results obtained with this two-scale method are compared to the transmissivity computed with direct simulations carried out at the microscale on the whole fracture. This is performed on two model rough fractures, namely, a spiral groove and a fractal fracture, while varying their mean apertures to investigate a wide range of the average Knudsen number characteristic of the flow at the megascale. A good agreement is obtained between the two approaches showing the robustness of the two-scale method to determine the global transmissivity of the fracture while significantly reducing the overall computational time.
Item Type: | Article |
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Audience (journal): | International peer-reviewed journal |
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Institution: | Other partners > Arts et Métiers ParisTech (FRANCE) Other partners > Bordeaux INP - BINP (FRANCE) French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE) French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Other partners > Université de Bordeaux (FRANCE) |
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Deposited On: | 05 Nov 2019 17:53 |
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