Extension of TOUGH-FLAC to the finite strain framework

Blanco-Martín, Laura; Rutqvist, Jonny; Birkholzer, Jens T.

doi:10.1016/j.cageo.2016.10.015

Extension of TOUGH-FLAC to the finite strain framework

Journal Article · Sat Nov 05 00:00:00 EDT 2016 · Computers and Geosciences

DOI:https://doi.org/10.1016/j.cageo.2016.10.015· OSTI ID:1476565

Blanco-Martín, Laura ^[1]; Rutqvist, Jonny ^[1]; Birkholzer, Jens T. ^[1]

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Here, the TOUGH-FLAC simulator for coupled thermal-hydraulic-mechanical processes modeling has been extended to the finite strain framework. In the approach selected, this extension has required modifications to the flow simulator (TOUGH2) and to the coupling scheme between the geomechanics and the flow sub-problems. In TOUGH2, the mass and energy balance equations have been extended to account for volume changes. Additionally, as large deformations are computed by FLAC^3D, the geometry is updated in the flow sub-problem. The Voronoi partition needed in TOUGH2 is computed using an external open source library (Voro++) that uses the centroids of the deformed geomechanics mesh as generators of the Voronoi diagram. TOUGH-FLAC in infinitesimal and finite strain frameworks is verified against analytical solutions and other approaches to couple flow and geomechanics. Within the finite strain framework, TOUGH-FLAC is also successfully applied to a large-scale case. The extension of TOUGH-FLAC to the finite strain framework has little impact to the user as only one additional executable is needed (for Voro++), and the input files and the workflow of a simulation are the same as in standard TOUGH-FLAC. With this new provision for finite strains, TOUGH-FLAC can be used in the analysis of a wider range of engineering problems, and the areas of application of this simulator are therefore broadened.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1476565

Alternate ID(s):: OSTI ID: 1550665

Journal Information:: Computers and Geosciences, Journal Name: Computers and Geosciences Journal Issue: C Vol. 108; ISSN 0098-3004

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
FLAC3D
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coupled THM processes
finite strains
sequential modeling

Extension of TOUGH-FLAC to the finite strain framework

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