Operator-split α-QSS sub-stepped chemistry integrator with per-rank adaptive substepping#1647

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sbryngelson merged 13 commits into

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sbryngelson:aqss-adaptive-substepping

Jul 18, 2026

Commits on Jul 16, 2026

simulation: operator-split alpha-QSS sub-stepped chemistry integrator with per-rank adaptive substepping
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test,docs: sub-stepped chemistry regression test and reaction_substeps docs
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example: 2D reactive shock-bubble Richtmyer-Meshkov roll-up
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example: reactive shocktube with automated CFL dt + adaptive alpha-QSS substepping
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example: 2D cellular detonation with automated CFL dt + adaptive alpha-QSS substepping
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test: regenerate sub-stepped reactor golden for the alpha-QSS integrator
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build: pin pyrometheus == 1.1.1 (released with get_creation_destruction_rates)
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fix(chem): guard alpha-QSS normalization against zero sum; document alpha-QSS + adaptive controls
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test: regenerate 5D59DDF0 golden from a clean release build (deterministic provenance)
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review: guard chemistry+igr substepping, drop dead assignments, integer exponent, document stiffness metric
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Commits on Jul 17, 2026