Transient dual-porosity simulations of unsaturated flow in fractured rocks

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Description

This report describes the development and use of a semi-analytical dual-porosity simulator for unsaturated flow in fractured rock masses. Fluid flow between the fracture network and the matrix blocks is described by a nonlinear equation that relates the imbibition rate to the local difference in liquid-phase pressure between the fractures and the matrix blocks. This equation is a generalization of the Warren-Root equation, but is accurate in both early and late time regimes. The fracture/matrix interflow equation has been incorporated into a computational module that acts as a source/sink term for fracture elements; this module is compatible with the unsaturated ... continued below

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112 p.

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Zimmerman, R.W.; Hadgu, T. & Bodvarsson, G.S. January 1, 1995.

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Description

This report describes the development and use of a semi-analytical dual-porosity simulator for unsaturated flow in fractured rock masses. Fluid flow between the fracture network and the matrix blocks is described by a nonlinear equation that relates the imbibition rate to the local difference in liquid-phase pressure between the fractures and the matrix blocks. This equation is a generalization of the Warren-Root equation, but is accurate in both early and late time regimes. The fracture/matrix interflow equation has been incorporated into a computational module that acts as a source/sink term for fracture elements; this module is compatible with the unsaturated flow simulator TOUGH. Flow processes are then simulated using only fracture elements in the computational grid. This semi-analytical dual-porosity module has been tested with TOUGH on various problems involving transient flow in fractured/porous media, and compared with simulations performed using explicit discretization of the matrix blocks. The new semi-analytical dual-porosity model accurately simulates flow processes in unsaturated fractured rocks, and typically requires an order of magnitude less computational time than do simulations using fully-discretized matrix blocks.

Physical Description

112 p.

Notes

INIS; OSTI as DE95012438

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  • Other Information: PBD: Jan 1995

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  • Other: DE95012438
  • Report No.: LBL--36807
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/70743 | External Link
  • Office of Scientific & Technical Information Report Number: 70743
  • Archival Resource Key: ark:/67531/metadc704805

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  • January 1, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 5, 2016, 12:10 p.m.

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Zimmerman, R.W.; Hadgu, T. & Bodvarsson, G.S. Transient dual-porosity simulations of unsaturated flow in fractured rocks, report, January 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc704805/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.