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Can TOUGH3 EOS7C model temperature below 13 celsius degree?

I am modelling groundwater and gas migration using TOUGH3 EOS7C. I set up the model as an isothermal problem with a constant air temperature 5 degree (temperature assigned for atmospheric elements) and groundwater temperature 18 degree. It was realized that the model doesn't work for any air temperature below 13 degree, with error message "TOUGH STATUS: Failed in MULTI. IGOOD=           2". However, the model works fine for air temperature above 13 degree. It seems that the model has a temperature limit.

To double check this limitation, I tried the demo SAM7C1 (see attached input/output files). I tested the initial temperature for the element CO213. The same issue occurred. The demo works for the initial temperature above 13 degree but doesn't work for the initial temperature below 13 degree.

Any quick solution or suggestion will be deeply appreciated.

2 replies

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    • Curt_Oldenburg
    • 1 yr ago
    • Reported - view

    Jianhua,

    Yes, EOS7C has a lower limit of 12 C in its solubility model because this is a region where CO2 or CH4 hydrates could start to form, depending on pressure of course.  I suggest that you keep your system > 13 C.  If the delta-T between air and groundwater is important in your problem for heat transfer purposes, perhaps you can make your groundwater 26 C to maintain the 13-degree delta-T. 

    • Jianhua_Jiang
    • 1 yr ago
    • Reported - view

    Hi Curt, Thanks a lot for the helpful reply.

Content aside

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