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"Inactive" MINC elements

I want to make sure I'm interpreting the manual correctly as it pertains to "inactive" elements in a mesh involving MINC processing.  If I place a dummy element in front of all elements that I want to be associated with a single type defined in the ROCKS block, then will TOUGH2 proceed to perform calculations on these elements, or will they be treated as truly inactive?  In other words, will variables (pressure, saturation, etc.) change in these "inactive" elements throughout the simulation, or will they remain fixed as they would if there were no MINC elements?

2 replies

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    • Mikey_Hannon
    • 6 yrs ago
    • Reported - view

    Alright, after a quick test myself, it looks like these elements are truly inactive and don't change.  So, in general, is it possible for TOUGH2 simulations to include both MINC and non-MINC elements?  If so, how?

      • Finsterle GeoConsulting
      • Stefan_Finsterle
      • 6 yrs ago
      • Reported - view

      Mikey,

      The concept of "inactive" elements during MINC mesh generation means that all elements following the first element with a zero or negative volume will not  be "MINC-processed" ("MINCed"), i.e., will not be subdivided in multiple-continua elements. The resulting mesh will thus have both MINC and non-MINC elements.

      For the actual simulation run, the concept of "inactive" elements is used to specify Dirichlet boundary conditions, i.e., the zero-volume element has a different effect.

      Of course, if you put MINC processing and the simulation itself into same input file, you cannot separate the two effects, and all non-MINCed elements will also have Dirichlet boundary conditions. This is rarely the desired effect.

      So, use several steps:

      (1) Mesh generation (ENDFI at the end), with the zero-volume element separating the parts of the primary mesh that shall and shall-not be MINCed. You now have a mesh that contains MINC and non-MINC elements (and yes: the two types are correctly connected to each other).

      (2) Edit the resulting mesh file (named MINC) by (re)moving the zero-volume element or rearranging elements to separate the parts of the mesh that are active (i.e., primary variables change) and inactive (i.e., primary variables do not change, having the effect of a Dirichlet boundary condition).

      (3) Run the simulation (with ENDCY at the end).

      (4) Include the word "MINCed" as a proper verb into your vocabulary...

      Stefan

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