physics.fluid.water_hammer

• Golden tests 2 / 2
• Boundary tests 10 / 10
• 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 sha256:65b7d175dbd32dfa6504a357891cb0e9340be7681517fd7b1299c923235512b2

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

2026-09-17T12:57:09.947Z

Last reviewed

—

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