physics.fluid.sudden_expansion

Three distinct suites: educational examples on the calculator page, this legacy regression count (17/17 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-26.o2-o3.mild. Calculation version 1.0.0. CVP 1.0.0-proposed. 4/4 golden · 9/9 CVP boundary · 10/10 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 5/5 CVP contract. digest b687a9d58609. O2: Borda–Carnot sudden expansion vs a separate-module identity (≤2 ULP). Not minor-loss K given, not Darcy, and not Q=Av. ≤2 ULP vs O3 applies only to the published tabulated sudden-expansion vectors. Not minor-loss K given, not Darcy, and not Q=Av.

• Golden (oracle-backed) 4 / 4
• CVP boundary 9 / 9
• Invalid input 10 / 10
• Property 1 / 1
• Metamorphic 1 / 1
• O3 high-precision 8 / 8
• Cross-interface 2 / 2
• CVP contract 5 / 5
• Interfaces PASS · UI (SSR) / REST / MCP
• Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
• Verified scope h = (v1 − v2)² / (2g), plus pressure, velocity, and area solves, + O3 mpmath tabulated head.
• Assurance Engineering
• Deferred Not minor-loss K given, not Darcy, and not Q=Av.

• release artifacts aligned PASS
• schema output required declared PASS
• schema valid input executes PASS
• engine success output validates schema PASS
• rest success payload validates schema PASS

Fingerprint sha256:ed9626814e473ec68773b087522fb135943bb1420a37dfc0299249f5584764ae

Input schema sha256:6b4add58c2c638c72023661506e208ca320a2665b10653cfa4bef0ef7649e818 · Output schema sha256:2b412c3601a14f099631871122ccefdfbe139c14612db66c6edae1af4d8dbe07 · 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-expansion

Engine

sudden-expansion

Engine build

2026-09-17

Evidence core

2026-09-17T10:27:24.934Z

Rendered

2026-11-10T05:18:41.952Z

Last reviewed

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Assumptions

• Borda–Carnot sudden expansion: h = (v1 − v2)² / (2g); K = (1 − v2/v1)² is reported, not an input
• Default g=9.80665 m/s²; default ρ=1000 kg/m³ for Δp = ρ (v1−v2)² / 2; incompressible; A2 > A1
• Not minor-loss K given, not Darcy f, not orifice C_d, not Q=Av, not sudden contraction

Limitations

• Borda–Carnot sudden expansion: h = (v1 − v2)² / (2g); K = (1 − v2/v1)² is reported, not an input
• Default g=9.80665 m/s²; default ρ=1000 kg/m³ for Δp = ρ (v1−v2)² / 2; incompressible; A2 > A1
• Not minor-loss K given, not Darcy f, not orifice C_d, not Q=Av, not sudden contraction