forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
67e05548b1
Main's oracle job failed at 8cba3a7: scordelis-lo-roof-solid u_z moved from
-0.3014029226397275 (blessed before #50) beyond its 1e-9 band. The case is a
thin shell (R/t = 100) of one layer of hex20R solids, ill-conditioned, so
rounding alone moves u_z by about 1e-9 relative: on macOS #50's multithreaded
supernodal factorisation moved it by 8.2e-10 (to -0.3014029223929), #52's
interpolation order by a further 1.3e-10 (to -0.3014029223541), and Linux
CI by slightly more, past the band. #52 kept the lattice geometry the same.
The result itself is unchanged at the 1e-9 level (0.33% from the
reference).
A quantity may now set `fixture_relative` (with a required
`fixture_reason`) for a wider fixture band; Scordelis-Lo uses 1e-7 and is
re-blessed. Moved-fixture messages print full precision.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
33 lines
1.5 KiB
JSON
33 lines
1.5 KiB
JSON
{
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"title": "Scordelis–Lo roof with one layer of hex20 reduced-integration solids",
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"kind": "benchmark",
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"source": "MacNeal and Harder, 'A proposed standard set of problems to test finite element accuracy', Finite Elements in Analysis and Design 1 (1985) 3–20: Fig. 8 (p. 8) geometry, material and load; Table 5(a) (p. 11) reference displacement 0.3024; Belytschko et al., Computer Methods in Applied Mechanics and Engineering 51 (1985) 221–258 (shell obstacle course)",
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"quantities": [
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{
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"id": "uz",
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"quantity": "vertical displacement at the midpoint of the free edge, mid-surface",
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"measure": {
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"command": "solve.probe",
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"params": {
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"step": "Load",
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"at": [
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[
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0,
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16.069690242163,
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19.151111077974
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]
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]
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},
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"pointer": "/nodes/0/displacement/2"
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},
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"value": -0.3024,
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"tolerance": {
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"relative": 0.02
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},
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"reason": "MacNeal and Harder grade an element A within 2% of the theoretical value on this prescribed coarse mesh (p. 14); MacNeal and Harder normalise by 0.3024 (the deep-shell value quoted in their [5] is 0.3086), and a solid model of R/t = 100 differs from shell theory by O(t/R)",
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"fixture_relative": 1e-7,
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"fixture_reason": "a thin shell (R/t = 100) of one layer of solids is ill-conditioned: rounding moves u_z by about 1e-9 relative between equivalent orderings of the arithmetic (8e-10 when the solver's factorisation changed in #50, 1e-10 from the interpolation order in #52, more between platforms); 1e-7 still catches any real change"
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}
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]
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}
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