Question on the block of CONNE

Hello everyone,

I have a question on the block of CONNE. Whether can I only input part of the connections between two cells instead of all the connections? My goal to ask this is I want to output mass flux between two rows and I do not need other connections between cells. Please let me know if you have suggestions. Thank you.

Fang 

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  • Fang,

    You can do whatever you want (almost). There is no need to set up a "geometrically complete and correct" mesh. That flexibility is a strength of TOUGH2 that can be used to great effect - it is also somewhat risky (but I trust you know what you're doing...).

    Cheers,

    Stefan

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  • Thank you, Stefan. I appreciate your helps! I am trying to build a model with 41*34 cells and it contains 8 types of rocks. I found it is so time consuming for inputting each cell information (name, rock, volume, x, y, z in the block of ELEME) following the locations of "----1----*----2----*----3----*----4----*----5----*----6----*----7----*----8". I tried to use excel to input and then saved it as a text file, but the locations are changed and I have to adjust the information for each cell which costs lots of time. Could you please tell me a easy way to do that? Thank you very much!

    Fang
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  • Fang,

    Use MESHMAKER (see Appendix F of TOUGH2 manual) to create the mesh. After the basic mesh is created, you may want to use AssignRocks.exe (http://esd.lbl.gov/research/projects/tough/licensing/free.html) to assign your 8 materials to regions of the mesh (assuming you want a layered hydrostratigraphy).

    The generation of a TOUGH2 mesh almost always requires the use of (internal or external) pre-processing programs; check out http://esd.lbl.gov/research/projects/tough/software/processors.html for options.

    Stefan

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  • Hi Stefan, thank you so much for the information which is really helpful! I have one more question about the boundary condition. For the constant pressure boundary, it should be provided in the block of INCON as inactive cells. Am I right? If the cells for the constant pressure boundary are active, they are just the initial condition instead of the constant pressure boundary. Am I right? Is it the only way to assign constant pressure boundary? Thank you for all your help!

    Fang

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  • Fang,

    You're correct. Dirichlet boundary conditions are initial conditions specified for elements that are either inactive (i.e., are at the end of the ELEME block, after an element with zero or negative volume) or elements with a very lage volume (typically 1E50).

    Stefan

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  • Thank you Stefan. I got you. Could you tell me the command line using MESHMAKER to generate MESH? I wrote a text file based on Appendix F, but I do not know how to do it. Thank you.

    Fang

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  • Feng,

    You run it like any other TOUGH2 simulation.

    I strongly recommend you go through the sample problems of the manual step-by-step, or consult the other training material I mentioned in one of my previous replies.

    Good luck!

    Stefan

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