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Impacts of dead-ends on flow and transport in fractured rocks
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
2018 (English)In: 2nd International Discrete Fracture Network Engineering Conference, DFNE 2018, American Rock Mechanics Association (ARMA) , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Detailed simulation of flow and transport through a rough-walled fracture-matrix system with fracture dead-ends is performed. The analysis demonstrates a significant impact of fracture dead-ends on fluid flow and solute transport processes in the modelled system. Two 2D representative rock fracture-matrix models with and without fracture dead-ends are constructed based on high-resolution laser-scanned measurements of a granite rock fracture surface. Simulations of flow and transport with three P├ęclet numbers (Pe) ranging from 0.1 to 10 are conducted using a code implementing the finite volume method (FVM) to solve the Navier-Stokes equations (NSE) for water flow in the fracture, and the advection-diffusion equation (ADE) is adopted to solve for transport in the whole fracture-matrix system, also accounting for matrix diffusion. The features of the velocity fields and evolution of concentration distributions as well as breakthrough curves of the two modelled cases are presented and analyzed, with results showing that fracture dead-ends significantly affect solute transport processes and cause important retardation of transport in the fracture. This indicates that overly conservative assessments of solute mass arrivals may be made when fracture dead-ends are ignored in discrete fracture network modelling.

Place, publisher, year, edition, pages
American Rock Mechanics Association (ARMA) , 2018.
National Category
Geophysical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246522Scopus ID: 2-s2.0-85059386516OAI: oai:DiVA.org:kth-246522DiVA, id: diva2:1299146
Conference
2nd International Discrete Fracture Network Engineering Conference, DFNE 2018; Seattle; United States; 20 June 2018 through 22 June 2018
Note

QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-03-26Bibliographically approved

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Cvetkovic, Vladimir

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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  • Other locale
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Output format
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  • asciidoc
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