physics.fluid.froude

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. 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 9bc7c7e150bc. O2: Froude vs a separate-module identity (≤2 ULP). Not Reynolds, not Manning, not Chezy, and not Q=Av. ≤2 ULP vs O3 applies only to the published tabulated Froude vectors. Not Reynolds, not Manning, not Chezy, 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 Fr = v / √(g L), default g=9.80665, plus velocity and length solves, + O3 mpmath tabulated Fr.
• Assurance Engineering
• Deferred Not Reynolds, not Manning, not Chezy, 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 sha256:4d17d1a990250968739c7855529bed411f967783710ed9a6fc7e21062acfcfea

Input schema sha256:189ae3f2990cafd9678e2682774ffa9f92fc7a4a021cd4dd343e8d3a16c0fc19 · Output schema sha256:c7004951fec12c24824226e606ee6ad146d2f14da73873fc8cca776d89796f89 · 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

froude-number

Engine

froude-number

Engine build

2026-09-17

Evidence core

2026-09-17T06:59:55.310Z

Rendered

2026-11-10T05:18:41.937Z

Last reviewed

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Assumptions

• Froude Fr = v / √(g L); default g=9.80665 m/s²
• Free-surface: Fr<1 subcritical, Fr=1 critical, Fr>1 supercritical
• Not Reynolds, not Manning, not Chezy, not Q=Av

Limitations

• Froude Fr = v / √(g L); default g=9.80665 m/s²
• Free-surface: Fr<1 subcritical, Fr=1 critical, Fr>1 supercritical
• Not Reynolds, not Manning, not Chezy, not Q=Av