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How to implement the Mandel's effect with tough-flat coupling

Hello everyone, I'm a student during master's degree and have spent more than a year on tough-flac coupling, but still have some big problems on this field.

I want to achieve direct coupling of Tough2 and Flac3D, using the fixed stress method as Kim mentioned(Kim et al. 2011), not what Jonny did in 2001, which seems like indirect coupling. So I take Mandel's problem as a validation. I have asked some people who have done this, but my advisor did not provide further help, so I only know the key point is to modify the storage term in TOUGH2. As I have no idea about the source code,I just try to modify the porosity in every circle, but the decrease in porosity does not seem to bring about an increase in pore pressure. So the problem is, did porosity have nothing to do with mass conservation? Otherwise according to my understanding, the rapid decrease of volume space should lead to an increase in pore pressure. But I can only get a complete pore pressure dissipation process, which is same to the one-dimensional process, as shown in the attached picture

3 replies

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    • titanium_boat
    • 5 mths ago
    • Reported - view

    • titanium_boat
    • 5 mths ago
    • Reported - view

    Oh sorry, the title should be tough-flac but I changed it to flat. 

    I will be appreciate if anyone can help me 

    • Finsterle GeoConsulting
    • Stefan_Finsterle
    • 5 mths ago
    • Reported - view

    I won't be able to help you at all beyond this one reply. Of course, porosity is part of the mass accumulation term (please see the governing equations), and pressure increases due to loading changes or other forced porosity corrections can be simulation wit TOUGH2. Once you get familiar with the source code (sorry, there is no way around it if you want to couple TOUGH2 to Flac3D), you have to deal with porosity changes in at least two locations: in subroutine MULTI and CONVER (you may search for "DPHI=").

    Good luck!

Content aside

  • 5 mths agoLast active
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