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指導教授 : 陳瑞昇、董家鈞 老師 學生 : 楊慶中 日期 :99.12.30 - PowerPoint PPT Presentation


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International Journal of Rock Mechanics & Mining Sciences 39 (2002) 429-442. 指導教授 : 陳瑞昇、董家鈞 老師 學生 : 楊慶中 日期 :99.12.30. A MODELING APPROACH FOR ANALYSIS OF COUPLED MULTIPHASE FLUID FLOW , HEAT TRANSFER, AND DEFORMATION IN FRACTURED POROUS ROCK. J. Rutqvist ,Y.-S. Wu , C.-F Tsang , G. Bodvarsson.

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指導教授 : 陳瑞昇、董家鈞 老師 學生 : 楊慶中 日期 :99.12.30

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International Journal of Rock Mechanics & Mining Sciences 39 (2002) 429-442

指導教授:陳瑞昇、董家鈞 老師

學生:楊慶中

日期:99.12.30

A MODELING APPROACH FOR ANALYSIS OF COUPLED MULTIPHASE FLUID FLOW , HEAT TRANSFER, AND DEFORMATION IN FRACTURED POROUS ROCK

J. Rutqvist ,Y.-S. Wu , C.-F Tsang , G. Bodvarsson

1


Outline

  • Introduction

  • FLAC3D

  • TOUGH2

  • Coupling module

  • Examples Results

  • Conclusion

2


Introduction

  • Coupled thermal–hydrologic–mechanical processes under multiphase flow conditions are prevalent in geoscientific applications.

  • A few of the most important include nuclear waste disposal in geological media, deep underground injection of hazardous wasteand underground storage of carbon dioxide into permeable aquifers.

3


Introduction

  • However, there is no single computer code that handles general coupled thermal–hydrologic–mechanical processes .

  • The two codes—TOUGH2 and FLAC3D are linked using sequential execution and data transfer through nonlinear coupling functions.

4


FLAC3D

5


FLAC3D

  • FALC (Fast Lagrangian Analysis of Continua ), the finite difference code is developed by the United States Itasca Consulting Group Inc in 1986 ,and FLAC3D developed in 1994.

  • Code is developed for rock and soil mechanics and can also handle thermomechanical and hydromechanical problem for single-phase fluid flow.

6


FLAC3D

Motion equations

Cauchy’s fomula

7


FLAC3D


TOUGH2

9


TOUGH2

  • TOUGH(Transport of Unsaturanted Groundwater and Heat) developed in the Earth Sciences Division of Lawrence Berkeley National Laboratory in 1987.

  • TOUGH2 is a simulator for multiphase, multicomponent , non-isothermal flows in fractured-porous media.

10


TOUGH2

Governing equations

11


Coupling module

12


Coupling module

14


Coupling module

15


16


Examples Results

17


Examples Results

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Examples Results

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Examples Results

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Examples Results

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Examples Results

22


Examples Results

23


Examples Results

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Examples Results

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Conclusion


Conclusion

  • We have linked two codes—TOUGH2 and FLAC3D—for analysis of coupled thermal-hydrologic-mechanical processes.

  • The coupling modules contain nonlinear stress versus permeability functions.


Conclusion

  • In both these examples, the hydromechanical changes are relatively slow, which is most suitable for the sequentially explicit solution.

  • Problems with higher strain rates relative to fluid mobility may require the sequential implicit approach or ultimately a fully implicit coupledapproach.


Thank for your attention

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