{
  "model": "Hemodynamic Observatory synthetic carotid demonstration",
  "version": "2.0.0",
  "classification": "PHYSICS-INSPIRED DEMONSTRATION",
  "clinical_use": false,
  "patient_data": false,
  "numerical_cfd_solution": false,
  "geometry": {
    "provenance": "SYNTHETIC",
    "type": "idealized straight carotid segment with smooth super-Gaussian focal stenosis",
    "nominal_radius_m": 0.0032,
    "stenosis_definition": "fractional diameter reduction relative to nominal diameter",
    "default_diameter_reduction": 0.55
  },
  "fluid": {
    "density_kg_m3": 1060,
    "dynamic_viscosity_pa_s": 0.0035,
    "rheology": "Newtonian"
  },
  "wall": {
    "model": "rigid",
    "velocity_boundary": "analytic field vanishes at wall"
  },
  "inlet": {
    "provenance": "SYNTHETIC",
    "mean_velocity_m_s": 0.28,
    "waveform": "deterministic normalized synthetic periodic waveform",
    "cycle_period_s": 0.86
  },
  "velocity": {
    "provenance": "SYNTHETIC",
    "method": "analytic reduced-order axisymmetric field with exact sectional flux construction, continuity-derived radial component, zero-area-mean post-stenotic profile disturbance, and bounded axisymmetric swirl"
  },
  "streamlines": {
    "provenance": "DERIVED",
    "integrator": "classical RK4",
    "termination": ["wall/domain exit", "stagnation", "maximum path length", "invalid sample"]
  },
  "vorticity": {
    "provenance": "DERIVED",
    "method": "finite-difference numerical curl of implemented reduced-order velocity field"
  },
  "pressure": {
    "provenance": "APPROXIMATED",
    "method": "reduced-order convective/Bernoulli term plus explicit configured downstream loss term",
    "warning": "not a pressure field from a CFD pressure solve and not clinically validated"
  },
  "wall_shear": {
    "provenance": "DERIVED",
    "method": "magnitude from analytic reduced-order wall velocity gradients",
    "warning": "belongs only to the demonstration model"
  },
  "reynolds": {
    "provenance": "DERIVED",
    "definition": "rho * U_inlet_mean * D_nominal / mu"
  },
  "womersley": {
    "provenance": "DERIVED",
    "definition": "R_nominal * sqrt(omega * rho / mu)"
  }
}