{
  "qualification_id": "HX-CFD-QUAL-01",
  "title": "Two-fluid manifold-aware conjugate heat-transfer qualification",
  "updated_at": "2026-09-21",
  "status": "FAILED_NUMERICAL_GATES",
  "stage_decision": "HX-03 and HX-04 Stage B remain blocked",
  "current_status": {
    "date": "2026-09-21",
    "state": "ACCEPTANCE_REPAIR_AND_RETAINED_EVIDENCE_AUDIT_R2_COMPLETE",
    "qualification": "FAILED_NUMERICAL_GATES_UNCHANGED",
    "mesh_independence": "NOT_EVALUATED",
    "summary": "Fail-closed acceptance checks now have 40 behavioral tests. Native flux, energy/storage and interface heat rates were recovered; 36 field comparisons have exact topology correspondence. Cold-side flux/velocity settling and unresolved contract definitions still block qualification. No new CFD or historical rescoring.",
    "report": "/software/aero/evidence/reports/hx-cfd-qual-01-acceptance-audit-r2-2026-09-21/"
  },
  "authority_note": "These are retained OpenFOAM fixture results, not physical validation or design release.",
  "original": {
    "revision": "fine_structured_v5",
    "package": "Aero/reports/hx_cfd_qual_01",
    "mesh_independence": "FAIL",
    "max_adjacent_grid_change": 0.1309385517,
    "mesh_threshold": 0.01,
    "residual_convergence": "PASS_THRESHOLD",
    "monitor_stability": "NOT_ESTABLISHED",
    "run_completed": true,
    "mesh_quality": "PASS",
    "mass_conservation": "PASS",
    "energy_conservation": "PASS",
    "cells": {"coarse": 2880, "medium": 23040, "fine": 77760},
    "fine_heat_duty_W": 29073.16302536623,
    "fine_shell_outlet_K": 460.7601,
    "fine_tube_outlet_K": 439.0728
  },
  "remediation_v7": {
    "revision": "structured_v7",
    "package": "Aero/reports/hx_cfd_qual_01_remediation_v7_20260917",
    "mesh_independence": "PASS",
    "max_adjacent_grid_change": 0.0099543485,
    "mesh_threshold": 0.01,
    "residual_convergence": "NOT_ESTABLISHED",
    "monitor_stability": "NOT_ESTABLISHED",
    "run_completed": true,
    "mesh_quality": "PASS",
    "mass_conservation": "PASS",
    "energy_conservation": "PASS",
    "cells": {"coarse": 184320, "medium": 360000, "fine": 622080},
    "fine_heat_duty_W": 29787.545443056733,
    "fine_shell_outlet_K": 457.5076,
    "fine_tube_outlet_K": 442.4882,
    "fine_residual_max_last_window": 0.04778247,
    "fine_monitor_drift_K": {"shell_outlet": 0.0608, "tube_outlet": 0.0644}
  },
  "next_action": "Resolve and independently freeze mass time aggregation, absolute-pressure/property coverage, interface-temperature tolerance and geometry-backed local/history definitions before one targeted cold-side continuity experiment. No arbitrary pressure sweep, thermal-only continuation, three-grid campaign, HX-03 or HX-04 execution is authorized by this audit.",
  "solver_control_diagnostic": {
    "id": "HX-CFD-QUAL-01-SOLVER-CONTROL-V1",
    "status": "DIAGNOSTIC_ONLY_NOT_QUALIFIED",
    "scope": "Isolated coarse v7 copy, nOuterCorrectors 1 versus 2, through 100 s for the control.",
    "baseline_nOuterCorrectors": 1,
    "control_nOuterCorrectors": 2,
    "baseline_max_initial_residual": 0.00144013,
    "control_max_initial_residual": 0.00220704,
    "interpretation": "The bounded control does not establish an improvement in the existing initial-residual metric. Final linear residuals are not substituted for the qualification gate.",
    "open_gates_unchanged": ["RESIDUAL_CONVERGENCE", "MONITOR_STABILITY"],
    "report": "Aero/reports/hx_cfd_qual_01_solver_control_v1_20260917/SOLVER_CONTROL_REPORT.md"
  },
  "pressure_velocity_diagnostic": {
    "id": "HX-CFD-QUAL-01-PRESSURE-VELOCITY-DIAGNOSTIC-V1",
    "status": "FIELD_SPECIFIC_CONVERGENCE_FAILURE",
    "pressure_equation": "p_rgh remains high in both fluid regions; outlet pressure references and pressureInletOutletVelocity BCs were inspected.",
    "transverse_velocity": "q95 transverse speed is concentrated within the first 50 mm from each inlet and decays through the exchanger core.",
    "outlet_backflow": "No reverse-flow cells were detected in retained shell/tube outlet snapshots.",
    "steady_model_suitability": "NOT_ESTABLISHED",
    "report": "visuals/PRESSURE_VELOCITY_DIAGNOSTIC.md"
  },
  "solid_telemetry": {
    "solved_field": "e",
    "old_request": "h",
    "repair_status": "PATCHED_COPY_PROBE_RECORDED_NUMERIC_E_RESIDUALS",
    "evidence": "visuals/SOLID_TELEMETRY_REPAIR.md"
  },
  "visualizations": {
    "manifest": "visuals/VISUALIZATION_MANIFEST.json",
    "paraview_bundles": ["v5_fine_vtk.zip", "v6_fine_vtk.zip", "v7_fine_vtk.zip", "continuation_v1_fine_vtk.zip", "solver_control_v1_coarse_vtk.zip"],
    "monitor_animation": "visuals/hx_cfd_qual_01_outlet_monitors.gif"
  },
  "artifacts": {
    "original_report": "ORIGINAL_QUALIFICATION.md",
    "remediation_report": "REMEDIATION_V7.md",
    "original_mesh_study": "original-mesh-independence.json",
    "remediation_mesh_study": "remediation-v7-mesh-independence.json"
  }
}