DISV grid with an internal void (open-pit hole) generated outside ModelMuse — any known caveats?

[An Ho Antonio Taylor]

Hi Richard, hi all,

I'm working on an open-pit inflow model (following the general approach
from the "Simulación de ingresos a tajo abierto con MODFLOW 6" workflow)
and wanted to check whether this specific combination has any known
rough edges, since it's a less common path into ModelMuse than building
the grid natively.

Setup:
- Grid built with mf6Voronoi (https://github.com/hatarilabs/mf6Voronoi),
  via a GUI front-end I wrote for it, mf6Voronoi Studio
  (https://github.com/taylorc11/mf6voronoi-studio).
- The model limit contains a "void polygon" near the open-pit footprint.
  mf6Voronoi Studio seeds points along the void's boundary for a clean
  edge, then removes/clips any generated cell that falls inside it --
  since a DISV cell can't contain a hole, the void becomes a genuine gap
  in the horizontal mesh rather than a set of IDOMAIN=0 cells.
- Exported as a complete MODFLOW 6 DISV simulation (FloPy-written) and
  imported into ModelMuse via File -> Import -> Import MODFLOW-6 Model.
- Final grid: NLAY 15, NCPL 47,094, NVERT 93,014 (706,410 active cells
  total). ModelMuse's own re-exported .disv matches the imported one
  cell-for-cell, and MODFLOW 6 ran successfully against it, so the
  import itself seems solid.

Question for the group (and especially for Richard, given the DISV
support in ModelMuse): is an externally-generated DISV grid with a
genuine internal hole like this something ModelMuse is expected to
fully support long-term, or are there known caveats around it --
e.g. assigning boundary conditions along an irregular internal void
edge that ModelMuse's own grid tools wouldn't normally produce,
contouring/display near that gap, or grid-editing operations that
assume a topologically "simple" (hole-free) DISV mesh?

[Richard Winston]

There shouldn't be any problems with generating a DISV model as you did or with using it with ModelMuse or MODFLOW 6.

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This group was created in 2004 by Mr. C. P. Kumar, Former Scientist 'G', National Institute of Hydrology, Roorkee. Please visit his webpage at https://cpkumar.neocities.org/
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[Jakab Andras - Gmail]

I don't really understand why did you prefer the gap instead of the IDOMAIN=0 option. The latter one would likely need a lower number of cells and you don't have to seed around the perimeter. Both solutions, however, have the defficiency of not being able to accomodate a dynamically expanding mine pit.

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