New model#702

Draft

jshipton wants to merge 17 commits intomainfrom

Commits on Jan 12, 2026

SIQN model class for compressible Euler equations and simple example script
jshipton
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generalise SIQN model class to other equation sets
jshipton
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Commits on Jan 13, 2026

pass through subcycling options to model and change Williamson 5 to use model
jshipton
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correct minor typo in docs
jshipton
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Merge branch 'main' of https://github.com/firedrakeproject/gusto into new_model
jshipton
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output seems to go better as an arg to the setup method
jshipton
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change for output arg
jshipton
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pass through some more options, use model in Schaer test (changes some of the settings) and fix lint
jshipton
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add diffusion to model and use in straka bubble (changes some settings)
jshipton
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be sneaky with kwargs to get over issue that different equation sets have different interfaces; also use to enable passing different physics options to SIQN timestepper. Do not expect Tom to like...
jshipton
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add lowest order SIQN model - not sure what to do for diffusion...
jshipton
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model name change in example scripts
jshipton
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