physics.fluid.venturi

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 2026-09-25.o2-o3. Calculation version 1.0.0. CVP 1.0.0-proposed. 4/4 golden · 9/9 CVP boundary · 9/9 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 6/6 CVP contract. digest a4f2e3873621. O2: venturi meter vs a separate-module identity (≤2 ULP). Not an orifice wrap, not Q=Av, and not Darcy. ≤2 ULP vs O3 applies only to the published tabulated venturi vectors. Not Q=Av, not Manning, and not Darcy.

• Golden (oracle-backed) 4 / 4
• CVP boundary 9 / 9
• Invalid input 9 / 9
• Property 1 / 1
• Metamorphic 1 / 1
• O3 high-precision 8 / 8
• Cross-interface 2 / 2
• CVP contract 6 / 6
• 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 Q = Cd E A2 sqrt(2 Δp/ρ), E = 1/sqrt(1−β^4), default Cd = 0.98, plus pressure, throat, and Cd solves, + O3 mpmath tabulated discharge.
• Assurance Engineering
• Deferred Not an orifice wrap, not Q=Av, and not Darcy.

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

Fingerprint sha256:a8883abb131362b9a281b5c4790a515f8c17b6890ef76f0040c477af31316db2

Input schema sha256:c4da2ae37ad4ee5e90b9bbaf74312fe153c1c329d3f98a66377ac11f4d52e539 · Output schema sha256:6026cf5a2c5ebcdb14abe4f7f002bc1233ea273c3230da7855d0ad4bd663665c · 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

venturi

Engine

venturi

Engine build

2026-09-17

Evidence core

2026-09-17T05:19:25.805Z

Rendered

2026-11-10T05:18:41.932Z

Last reviewed

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Assumptions

• Incompressible venturi tube; SI; default C_d=0.98; C_d in (0, 1]
• Q=C_d A2 √(2Δp/(ρ(1−β⁴))), β=D2/D1; Q_ideal uses C_d=1
• Optional same-fluid manometer Δh with Δp=ρ g Δh; not tank H
• Not an orifice plate, not Q=Av, not Darcy, not minor-loss K, not valve Cv/Kv

Limitations

• Incompressible venturi: Q = C_d A2 √(2Δp/(ρ(1−β⁴))), β=D2/D1; default C_d=0.98
• Ideal Bernoulli Q_ideal uses C_d=1; optional same-fluid manometer Δh, Δp=ρ g Δh
• Not an orifice plate, not Q=Av, not Darcy, not minor-loss K, not valve Cv/Kv