physics.fluid.sudden_contraction

• Golden tests 2 / 2
• Boundary tests 11 / 11
• Property tests 5 / 5
• Production surface contract 3 / 3
}
• Engine tested Yes
• Source checked Yes
• Artifact integrity PASS
• Production attestation Embedded snapshot: STALE · Last attested schema matched 1.0.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status PASS (0 stale; 163 CURRENT) @ 2026-09-17T13:12:27.589Z
• Semantic contract PASS
• Evidence attested at 2026-09-17T13:12:26.751Z
• Last production check 2026-09-17T13:12:26.751Z
• Public / cache PASS
• Origin PASS
• Supplemental domain review Not performed
• Named expert review Not performed

• release artifacts aligned PASS
• schema valid input executes PASS
• engine success output validates schema PASS

Fingerprint sha256:be3251cbdbad0ee793c810ba3b46f0a5481055b160e746c811ba2bd0cd0bbce3

Input schema sha256:c8e7d066fe9ad79411d7dd0eb1797f4712db8dfefacf2a586d0c84982fa4bab3 · Output schema sha256:b382e01ba9f7fd69ef970411279d86fce3fd94cb0e0d2a5999ca66d743cb1f7b · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

sudden-contraction

Engine

sudden-contraction

Engine build

2026-09-17

Evidence core

2026-09-17T10:42:29.836Z

Rendered

2026-09-17T12:57:09.949Z

Last reviewed

—

Assumptions

• Vena-contracta sudden contraction: h = (1/C_c − 1)² v2² / (2g); default C_c=0.62; K = (1/C_c − 1)² is reported, not an input
• Default g=9.80665 m/s²; default ρ=1000 kg/m³ for Δp = ρ K v2² / 2; incompressible; C_c in (0, 1)
• Not sudden expansion (v1−v2)², not minor-loss K given, not Darcy f, not orifice C_d, not Q=Av

Limitations

• Vena-contracta sudden contraction: h = (1/C_c − 1)² v2² / (2g); default C_c=0.62; K is reported, not an input
• Default g=9.80665 m/s²; default ρ=1000 kg/m³ for Δp = ρ K v2² / 2; incompressible; C_c in (0, 1)
• Not sudden expansion (v1−v2)², not minor-loss K given, not Darcy f, not orifice C_d, not Q=Av