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IBFM mask velocity diffusion#1950

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mbkuhn wants to merge 4 commits into
kynema:mainfrom
mbkuhn:ibfm_mask_diffusion
Open

IBFM mask velocity diffusion#1950
mbkuhn wants to merge 4 commits into
kynema:mainfrom
mbkuhn:ibfm_mask_diffusion

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@mbkuhn

@mbkuhn mbkuhn commented May 21, 2026

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Summary

Avoid considering the effects of diffusion on cells that are terrain, not fluid. Replaces #1904 after the rename.

Pull request type

Please check the type of change introduced:

  • Bugfix
  • Feature
  • Code style update (formatting, renaming)
  • Refactoring (no functional changes, no api changes)
  • Build related changes
  • Documentation content changes
  • Other (please describe):

Checklist

The following is included:

  • new unit-test(s)
  • new regression test(s)
  • documentation for new capability

This PR was tested by running:

  • the unit tests
    • on GPU
    • on CPU
  • the regression tests
    • on GPU
    • on CPU

Additional background

Issue Number:

@mbkuhn mbkuhn requested a review from mchurchf May 21, 2026 17:51
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