44 lines
2.4 KiB
Markdown
44 lines
2.4 KiB
Markdown
# Coupled harmonic-surface convergence study
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The user has deferred positivity enforcement. This study keeps density an
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independent Q2 field and retains the simultaneous all-m degree-four harmonic
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surface/interior system. The primary milestones are useful convergence at
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higher index and angular momentum, and both enthalpy-pressure virials below
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1e-5. Negative-density measurements remain diagnostic, not acceptance repairs.
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Base revision: `ef76e0c`. Work is isolated on
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`research/coupled-convergence-study-20260919`, with separate
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`research/linear-coupling-study-20260919` and
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`research/model-slices-20260919` branches for independent implementations.
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The original programming checkout is unchanged.
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First screen: n=2,J=0; n=3,J=0 at forcing tolerances 0.03 and 0.003;
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n=1,J=0.1; n=1.5,J=0.1. All use the same Q2 density, Q3 enthalpy and
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displacement, RT2/Q2 gravity, Q4 geometry, reference mesh, normalization,
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default inverse, 12-update budget, restart 160, and 300-iteration linear
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budget. Only n=3 includes the existing central phase condition. This tests
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whether a tenfold more accurate direction changes the n=3 trajectory, but
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it is not a same-state preconditioner comparison. Capture updates 0,3,7
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for subsequent controlled probes. No input J is identified with a calibrated
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fraction of critical rotation.
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Follow-up decisions depend on this screen and source review: frozen-state
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preconditioner/forcing comparisons; small coupled surface/border corrections;
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accepted-state continuation with checked field/coordinate transfer. Linear
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claims require independently applied full-J residuals; nonlinear claims use
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common stopping thresholds plus physical diagnostics, not residual alone.
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Report scalar-border forcing separately from the unbordered equations.
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The slice feature will evaluate physical geometry and independent fields,
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show the material surface at true scale, retain signed density, and separate
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outside-domain points from valid interior samples. It must not silently turn a
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reference-coordinate cut into a physical planar cut.
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Builds and expensive numerical cases run serially. The existing campaign
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runner records exact source, binary, mesh, arguments, saved states and output
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hashes. Initial evidence directory:
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`../../diagnostics/coupled_convergence_2026-09-19/screen_v1`.
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Results and any adaptive extensions will be recorded below before finalizing
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the study. Defaults and the physics-facing API are unchanged.
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