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  "mesh": {
    "cells": 367617,
    "connected_fluid_regions": 1,
    "core_check": "Mesh OK",
    "face_tetrahedra": "passed",
    "cell_determinant": "passed",
    "extended_concave_cell_check": "flagged",
    "concave_cells": 13685,
    "removed_degenerate_cells": 430,
    "maximum_non_orthogonality_deg": 64.40626228,
    "maximum_skewness": 3.015191461,
    "layer_coverage_fraction": 0.473,
    "surface_cell_size_m": 0.05,
    "cabin_cell_size_m": 0.025
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  "grid_independence_verified": false,
  "vehicle_experiment_validated": false,
  "limits": [
    "Approximate 25 mm reconstructed game display geometry, not manufacturer CAD.",
    "First-order Euler/upwind URANS; 0.2 s averaging window initialized from a RANS field. Long-time statistics and grid independence are unverified.",
    "Fixed floor and wheels; empty cabin, windows down, no crosswind.",
    "Partial prism-layer coverage and extended concave-cell warning.",
    "Particles follow the short-time average, not instantaneous turbulent trajectories. No validated drag, passenger comfort, buffeting spectrum or noise prediction."
  ]
}