Public evidence

physics.fluid.cavitation

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

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Verification

17/17 calculation tests · Production surface contract 3/3

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:e3a671d157787e92a9fd358d26c296bd4973b85bb67f82eee6af140f281bd7b5

Input schema sha256:795dfff7a79de93cdcd92535f6e6e8f07209e56ed5c2831270aa10f8f8ca175c · Output schema sha256:d479c5fa0300f2187cb9e7753be40e05cba41ee98001875e9659d2cc1f2a611d · 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.

Build & scope

Engine identity and declared limitations.

Tool: cavitation-number
Engine: cavitation-number
Engine build: 2026-09-17
Evidence core: 2026-09-17T10:13:14.968Z
Rendered: 2026-09-17T12:57:09.948Z
Last reviewed: —

Assumptions

Cavitation number σ = (p − p_v) / (½ ρ v²); default ρ=1000 kg/m³; p and p_v absolute Pa
Not NPSH head, not Thoma σ_Th=NPSH/H, not Weber We=ρv²L/σ, not Euler Eu=Δp/(ρ v²)
Not Reynolds, not capillary Ca=μv/σ, not Q=Av

Limitations

Cavitation number σ = (p − p_v) / (½ ρ v²); default ρ=1000 kg/m³; p and p_v absolute Pa
Not NPSH head, not Thoma σ_Th=NPSH/H, not Weber We=ρv²L/σ, not Euler Eu=Δp/(ρ v²)
Not Reynolds, not capillary Ca=μv/σ, not Q=Av

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

ISO 80000-11 — Characteristic numbers — Cavitation number
Supports: σ = (p − p_v) / (½ ρ v²); inertia vs vapor-pressure deficit, not NPSH head
ISO 80000-4 — Mechanics — Pressure
Supports: p and p_v are absolute pressures; ½ ρ v² is a dynamic pressure

Published checks

Golden, boundary, and property cases included in this evidence build.

ID	Kind	Status	Detail
`golden-cav-sigma`	golden	pass	Expected sigma=2 · p=150000 · p_v=50000 · rho=1000 · v=10 · mode=number · model=cavitation · Actual mode=number · sigma=2 · p=150000 · p_v=50000 · rho=1000 · v=10 · model=cavitation
`golden-cav-p`	golden	pass	Expected p=150000 · model=cavitation · Actual mode=pressure · sigma=2 · p=150000 · p_v=50000 · rho=1000 · v=10 · model=cavitation
`boundary-cav-v`	boundary	pass	Expected v=10 · model=cavitation · Actual mode=velocity · sigma=2 · p=150000 · p_v=50000 · rho=1000 · v=10 · model=cavitation
`boundary-cav-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-cav-npsh`	boundary	pass	Expected MIXED_INPUT_ENCODING · Actual MIXED_INPUT_ENCODING
`boundary-cav-We`	boundary	pass	Expected MIXED_INPUT_ENCODING · Actual MIXED_INPUT_ENCODING
`boundary-cav-Re`	boundary	pass	Expected MIXED_INPUT_ENCODING · Actual MIXED_INPUT_ENCODING
`boundary-cav-A`	boundary	pass	Expected MIXED_INPUT_ENCODING · Actual MIXED_INPUT_ENCODING
`boundary-cav-dP`	boundary	pass	Expected MIXED_INPUT_ENCODING · Actual MIXED_INPUT_ENCODING
`boundary-cav-mode`	boundary	pass	Expected INVALID_MODE · Actual INVALID_MODE
`boundary-cav-zero`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`boundary-cav-margin`	boundary	pass	Expected VALUE_OUT_OF_RANGE · Actual VALUE_OUT_OF_RANGE
`property-cav-sigma`	property	pass	σ=(p−p_v)/(½ρv²)
`property-cav-roundtrip-p`	property	pass	p invert
`property-cav-roundtrip-v`	property	pass	v invert
`property-cav-rho`	property	pass	ρ default 1000
`property-cav-model`	property	pass	cavitation