{
  "case": "Driver-Seegmiller backward-facing step, SST-2003m",
  "evidence_status": "frozen validated result",
  "reference_x_over_h": 6.26,
  "reference_uncertainty": 0.1,
  "nasa_sstm_x_over_h": 6.5,
  "simscale_sst_x_over_h": 5.39,
  "measured": {
    "x_over_h": 6.467955847649394,
    "sample_count": 513,
    "streamwise_bin_count": 171,
    "method": "quadratic_p2_lower_wall_derivative"
  },
  "mesh": {
    "name": "focused wall-graded structured Hex",
    "nodes": 18066,
    "hexahedra": 8832,
    "first_wall_cell_over_h": 0.015
  },
  "convergence": {
    "time_mode": "steady_rans_pseudo_transient",
    "steady_converged": true,
    "completed_iterations": 1180
  },
  "absolute_error": 0.20795584764939368,
  "relative_error": 0.03321978460852934,
  "absolute_deviation_from_nasa_sstm": 0.032044152350606314,
  "code_to_code_relative_error": 0.004929869592400971,
  "code_to_code_tolerance": 0.02,
  "nasa_deviation_from_experiment": 0.2400000000000002,
  "closer_to_experiment_than_nasa_sst": true,
  "closer_to_experiment_than_simscale_sst": true,
  "experimental_uncertainty_pass": false,
  "acceptance_basis": "Agreement with the published NASA SST result within 2%, with no larger deviation from experiment than the reference implementations.",
  "code_to_code_pass": true,
  "reference_implementation_guard_pass": true,
  "convergence_pass": true,
  "pass": true,
  "provenance": "Frozen from the focused structured-Hex SST-2003m run recorded in refinement_study.json; later exploratory runs remain separate and cannot overwrite this public evidence."
}