physics.fluid.water_hammer

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 · 10/10 CVP boundary · 11/11 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 5/5 CVP contract. digest aec02649b485. O2: Joukowsky Δp=ρ c Δv vs a separate-module identity (≤2 ULP). Not Darcy, not minor-loss K, not Moens–Korteweg c, and not Q=Av. ≤2 ULP vs O3 applies only to the published tabulated water-hammer vectors. Not catalog K, not pipe-entrance geometry, not sudden expansion (v1−v2)², not Darcy, and not Q=Av.

• Golden (oracle-backed) 4 / 4
• CVP boundary 10 / 10
• Invalid input 11 / 11
• 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 Δp = ρ c Δv (Joukowsky) with velocity and celerity solves; + O3 mpmath tabulated Δp.
• Assurance Engineering
• Deferred Not Darcy, not minor-loss K, not Moens–Korteweg c from K/D/e/E, 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 sha256:65b7d175dbd32dfa6504a357891cb0e9340be7681517fd7b1299c923235512b2

Input schema sha256:316c31fd08bed589e6ee4bcb648c719e32eab3bc355546ee6346828e8c13e71a · Output schema sha256:153e5d1a248cdfcd527793193daf0c77f323ac6a061abc9315bbb16fa2ed500a · 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

water-hammer

Engine

water-hammer

Engine build

2026-09-17

Evidence core

2026-09-17T09:45:11.688Z

Rendered

2026-11-10T05:18:41.947Z

Last reviewed

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Assumptions

• Joukowsky water hammer: Δp = ρ c Δv; h = Δp/(ρ g); default ρ=1000 kg/m³; default g=9.80665 m/s²
• c is the given celerity, not Moens–Korteweg from bulk modulus K, D, e, E
• Not Darcy f, not Colebrook, not minor-loss K, not Q=Av

Limitations

• Joukowsky water hammer: Δp = ρ c Δv; h = Δp/(ρ g); default ρ=1000 kg/m³; default g=9.80665 m/s²
• c is the given celerity, not Moens–Korteweg from bulk modulus K, D, e, E
• Not Darcy f, not Colebrook, not minor-loss K, not Q=Av