{
  "capability_id": "physics.fluid.sudden_expansion",
  "tool_id": "sudden-expansion",
  "engine": "sudden-expansion",
  "calculation_version": "1.0.0",
  "generated_at": "2026-11-10T05:18:41.952Z",
  "engine_build": "2026-09-17",
  "test_count": 17,
  "passed": 17,
  "failed": 0,
  "tests_summary": {
    "golden": {
      "passed": 2,
      "total": 2
    },
    "boundary": {
      "passed": 10,
      "total": 10
    },
    "property": {
      "passed": 5,
      "total": 5
    }
  },
  "engine_tested": true,
  "expert_reviewed": false,
  "internally_reviewed": false,
  "review_kind": null,
  "source_checked": true,
  "reviewed_by": null,
  "reviewer_role": null,
  "last_reviewed": null,
  "expert_review": {
    "status": "optional_not_performed",
    "reviewer": null,
    "scope": [
      "formula",
      "input semantics",
      "assumptions",
      "limitations",
      "sources",
      "tests"
    ],
    "note": "Domain expert review is optional under CVP (CVP-EXP-01). Absence does not block CVP Verified. See Review policy for supplemental domain assurance."
  },
  "internal_review": {
    "status": "not_applicable",
    "reviewer": null
  },
  "page": "https://www.calculatorx.com/calc/physics/sudden-expansion",
  "api": "https://www.calculatorx.com/api/v1/calc/sudden-expansion",
  "schema_input": "https://www.calculatorx.com/schemas/physics.fluid.sudden_expansion.input.json",
  "schema_output": "https://www.calculatorx.com/schemas/physics.fluid.sudden_expansion.output.json",
  "assumptions": [
    "Borda–Carnot sudden expansion: h = (v1 − v2)² / (2g); K = (1 − v2/v1)² is reported, not an input",
    "Default g=9.80665 m/s²; default ρ=1000 kg/m³ for Δp = ρ (v1−v2)² / 2; incompressible; A2 > A1",
    "Not minor-loss K given, not Darcy f, not orifice C_d, not Q=Av, not sudden contraction"
  ],
  "limitations": [
    "Borda–Carnot sudden expansion: h = (v1 − v2)² / (2g); K = (1 − v2/v1)² is reported, not an input",
    "Default g=9.80665 m/s²; default ρ=1000 kg/m³ for Δp = ρ (v1−v2)² / 2; incompressible; A2 > A1",
    "Not minor-loss K given, not Darcy f, not orifice C_d, not Q=Av, not sudden contraction"
  ],
  "boundary_conditions": [
    "missing v1, v2, h, or A1 when required → MISSING_REQUIRED_INPUT",
    "v1 ≤ 0, h ≤ 0, or A1 ≤ 0 → VALUE_MUST_BE_POSITIVE",
    "v2 ≥ v1 → VALUE_OUT_OF_RANGE",
    "K, f/Re, Q, C_d → MIXED_INPUT_ENCODING",
    "minor, darcy, or orifice as mode → INVALID_MODE"
  ],
  "sources": [
    {
      "title": "ISO 80000-4 — Mechanics",
      "section": "Length, speed, pressure",
      "url": "https://www.iso.org/standard/31895.html",
      "supports": "h is a head; v is a speed; Δp is a pressure",
      "kind": "standard"
    },
    {
      "title": "Borda–Carnot equation",
      "section": "Sudden enlargement",
      "supports": "h=(v1−v2)²/(2g) for incompressible sudden expansion; K=(1−A1/A2)²",
      "kind": "reference"
    }
  ],
  "methods": [],
  "fingerprint": "sha256:ed9626814e473ec68773b087522fb135943bb1420a37dfc0299249f5584764ae",
  "tier": "engine_tested",
  "verification": {
    "tests": {
      "passed": 17,
      "total": 17,
      "golden": 2,
      "boundary": 10,
      "property": 5
    },
    "contract_checks": {
      "passed": 5,
      "total": 5
    }
  },
  "evidence_core_generated_at": "2026-09-17T10:27:24.934Z",
  "rendered_at": "2026-11-10T05:18:41.952Z",
  "release_integrity": {
    "status": "verified",
    "scope": "workspace",
    "production_attestation_required": true,
    "calculation_version": "1.0.0",
    "artifacts": {
      "engine": "1.0.0",
      "page": "1.0.0",
      "capability": "1.0.0",
      "evidence": "1.0.0",
      "input_schema": "1.0.0",
      "output_schema": "1.0.0",
      "mcp_contract": "1.0.0"
    },
    "digests": {
      "input_schema_sha256": "6b4add58c2c638c72023661506e208ca320a2665b10653cfa4bef0ef7649e818",
      "output_schema_sha256": "2b412c3601a14f099631871122ccefdfbe139c14612db66c6edae1af4d8dbe07",
      "evidence_sha256": "97543bce2f4172e1e8589fdc3b0c83ebb68353f01e96ac0a4f0e0df47f740bb3",
      "evidence_core_sha256": "97543bce2f4172e1e8589fdc3b0c83ebb68353f01e96ac0a4f0e0df47f740bb3",
      "capability_sha256": "e9e34d604b88c1784a156f0b3a98195a72ff8f40d95273053a82ea94e3bfdb2b",
      "engine_sha256": "c6ebd8436f08b413e1ac6317b2d48550f2e6639a90dff254244e3aa562158b8d",
      "mcp_contract_sha256": "eb3e39ad4a95ed263415b4932f185d5edfe00a2403267b7c5ed5f718d1ff6da3"
    },
    "contract_checks": {
      "total": 5,
      "passed": 5,
      "failed": 0,
      "items": [
        {
          "id": "release-artifacts-aligned",
          "status": "pass",
          "detail": "1.0.0"
        },
        {
          "id": "schema-output-required-declared",
          "status": "pass"
        },
        {
          "id": "schema-valid-input-executes",
          "status": "pass"
        },
        {
          "id": "engine-success-output-validates-schema",
          "status": "pass"
        },
        {
          "id": "rest-success-payload-validates-schema",
          "status": "pass"
        }
      ]
    },
    "report": "https://www.calculatorx.com/.well-known/calculatorx-release-integrity.json"
  },
  "tests": [],
  "disclosure": {
    "policy": "calculatorx-public-evidence-v1",
    "full_validation": "private",
    "representation": "summary"
  }
}
