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modify FFI treatment to use dt / tau#50

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Yurlungur wants to merge 2 commits intomasterfrom
jmm/ffi-timescale
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modify FFI treatment to use dt / tau#50
Yurlungur wants to merge 2 commits intomasterfrom
jmm/ffi-timescale

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PR Summary

This moves the FFI treatment to a slightly more robust model where the FFI only completes on a timescale $\tau$, rather than instantaneously. This removes the need to check that $\tau < \Delta t$. Gail is going to suggest a more sophisticated time scale to use for this transformation.

This model essentially moves the FFI model closer to a BGK treatment in spirit.

PR Checklist

  • Adds a test for any bugs fixed. Adds tests for new features.

@Yurlungur Yurlungur requested a review from kelslund March 4, 2026 15:38
@Yurlungur Yurlungur self-assigned this Mar 4, 2026
@Yurlungur Yurlungur added the enhancement New feature or request label Mar 4, 2026
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Now updated with Gail's formula

@Yurlungur Yurlungur mentioned this pull request Mar 5, 2026
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