croissant.json

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  },
  "@type": "sc:Dataset",
  "name": "CCA_data",
  "description": "CFD simulation dataset for Collaborative Combat Aircraft (CCA) designs. Each case contains a parametrically defined 3D geometry (STL), simulation inputs, and RANS aerodynamic results (force/moment coefficients, surface and volume flow fields) across flight conditions",
  "conformsTo": "http://mlcommons.org/croissant/1.0",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "url": "https://huggingface.co/buckets/KC206/CCA_data",
  "version": "1.0.0",
  "datePublished": "2026-04-26",
  "citeAs": "KC206. CCA_data: CFD Dataset for Collaborative Combat Aircraft. HuggingFace, 2026. https://huggingface.co/buckets/KC206/CCA_data",
  "distribution": [
    {
      "@type": "cr:FileObject",
      "@id": "bucket",
      "name": "bucket",
      "description": "HuggingFace Xet storage bucket containing all case folders.",
      "contentUrl": "https://huggingface.co/buckets/KC206/CCA_data",
      "encodingFormat": "application/x-xet",
      "sha256": "https://github.com/mlcommons/croissant/issues/80"
    },
    {
      "@type": "cr:FileSet",
      "@id": "force-coeff-csvs",
      "name": "force-coeff-csvs",
      "description": "Corrected force and moment coefficient CSVs, one per case per angle-of-attack.",
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      "encodingFormat": "text/csv",
      "includes": "case_*/results/alpha_*/force_coefficents_corected.csv"
    },
    {
      "@type": "cr:FileSet",
      "@id": "design-param-jsons",
      "name": "design-param-jsons",
      "description": "JSON files with geometric design parameters for each case.",
      "containedIn": {"@id": "bucket"},
      "encodingFormat": "application/json",
      "includes": "case_*/design_parameter_sample_*.json"
    },
    {
      "@type": "cr:FileSet",
      "@id": "sim-param-jsons",
      "name": "sim-param-jsons",
      "description": "JSON files with CFD simulation configuration for each case.",
      "containedIn": {"@id": "bucket"},
      "encodingFormat": "application/json",
      "includes": "case_*/params.json"
    },
    {
      "@type": "cr:FileSet",
      "@id": "stl-meshes",
      "name": "stl-meshes",
      "description": "STL surface mesh files, one per case.",
      "containedIn": {"@id": "bucket"},
      "encodingFormat": "model/stl",
      "includes": "case_*/design_*.stl"
    },
    {
      "@type": "cr:FileSet",
      "@id": "surface-vtp",
      "name": "surface-vtp",
      "description": "VTK PolyData XML surface flow field files.",
      "containedIn": {"@id": "bucket"},
      "encodingFormat": "application/vnd.vtk",
      "includes": "case_*/results/alpha_*/surfaces/*.vtp"
    },
    {
      "@type": "cr:FileSet",
      "@id": "volume-szplt",
      "name": "volume-szplt",
      "description": "Tecplot SZL volumetric flow field files.",
      "containedIn": {"@id": "bucket"},
      "encodingFormat": "application/octet-stream",
      "includes": "case_*/results/alpha_*/volumes/volume.szplt"
    }
  ],
  "recordSet": [
    {
      "@type": "cr:RecordSet",
      "@id": "force_coefficients",
      "name": "force_coefficients",
      "description": "Aerodynamic force and moment coefficients (CL, CD, CFx, CFy, CFz, CMx, CMy, CMz plus pressure and skin-friction components) per case and angle-of-attack.",
      "field": [
        {
          "@type": "cr:Field",
          "@id": "force_coefficients/case_id",
          "name": "force_coefficients/case_id",
          "description": "Case identifier, e.g. case_12.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {"@id": "force-coeff-csvs"},
            "extract": {"fileProperty": "fullpath"},
            "transform": {"regex": "^(case_[0-9]+)/results/alpha_[^/]+/force_coefficents_corected\\.csv$"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "force_coefficients/alpha_tag",
          "name": "force_coefficients/alpha_tag",
          "description": "Angle-of-attack folder name, e.g. alpha_-4.750854229557356.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {"@id": "force-coeff-csvs"},
            "extract": {"fileProperty": "fullpath"},
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          }
        },
        {
          "@type": "cr:Field",
          "@id": "force_coefficients/coefficient",
          "name": "force_coefficients/coefficient",
          "description": "Coefficient name, e.g. CL, CD, CMy.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {"@id": "force-coeff-csvs"},
            "extract": {"column": "Unnamed: 0"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "force_coefficients/value",
          "name": "force_coefficients/value",
          "description": "Dimensionless coefficient value.",
          "dataType": "sc:Float",
          "source": {
            "fileSet": {"@id": "force-coeff-csvs"},
            "extract": {"column": "value"}
          }
        }
      ]
    },
    {
      "@type": "cr:RecordSet",
      "@id": "design_parameters",
      "name": "design_parameters",
      "description": "Geometric design parameters for each CCA case.",
      "field": [
        {
          "@type": "cr:Field",
          "@id": "design_parameters/case_id",
          "name": "design_parameters/case_id",
          "description": "Case identifier, e.g. case_12.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {"@id": "design-param-jsons"},
            "extract": {"fileProperty": "fullpath"},
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          }
        },
        {
          "@type": "cr:Field",
          "@id": "design_parameters/name",
          "name": "design_parameters/name",
          "description": "Parameter name.",
          "dataType": "sc:Text",
          "repeated": true,
          "source": {
            "fileSet": {"@id": "design-param-jsons"},
            "extract": {"jsonPath": "$.inputs[*].name"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "design_parameters/value",
          "name": "design_parameters/value",
          "description": "Parameter value (scalar, array, or string).",
          "dataType": "sc:Text",
          "repeated": true,
          "source": {
            "fileSet": {"@id": "design-param-jsons"},
            "extract": {"jsonPath": "$.inputs[*].value"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "design_parameters/units",
          "name": "design_parameters/units",
          "description": "Parameter units (deg, mm, or absent).",
          "dataType": "sc:Text",
          "repeated": true,
          "source": {
            "fileSet": {"@id": "design-param-jsons"},
            "extract": {"jsonPath": "$.inputs[*].units"}
          }
        }
      ]
    },
    {
      "@type": "cr:RecordSet",
      "@id": "simulation_params",
      "name": "simulation_params",
      "description": "CFD simulation flow conditions per case.",
      "field": [
        {
          "@type": "cr:Field",
          "@id": "simulation_params/case_id",
          "name": "simulation_params/case_id",
          "description": "Case identifier, e.g. case_12.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {"@id": "sim-param-jsons"},
            "extract": {"fileProperty": "fullpath"},
            "transform": {"regex": "^(case_[0-9]+)/params\\.json$"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "simulation_params/alpha_deg",
          "name": "simulation_params/alpha_deg",
          "description": "Angle of attack (degrees).",
          "dataType": "sc:Float",
          "source": {
            "fileSet": {"@id": "sim-param-jsons"},
            "extract": {"jsonPath": "$.alpha"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "simulation_params/velocity_m_s",
          "name": "simulation_params/velocity_m_s",
          "description": "Freestream velocity magnitude (m/s).",
          "dataType": "sc:Float",
          "source": {
            "fileSet": {"@id": "sim-param-jsons"},
            "extract": {"jsonPath": "$.velocity_magnitude"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "simulation_params/altitude_m",
          "name": "simulation_params/altitude_m",
          "description": "Altitude (m, ISA atmosphere).",
          "dataType": "sc:Float",
          "source": {
            "fileSet": {"@id": "sim-param-jsons"},
            "extract": {"jsonPath": "$.altitude_m"}
          }
        },
        {
          "@type": "cr:Field",
          "@id": "simulation_params/beta_deg",
          "name": "simulation_params/beta_deg",
          "description": "Sideslip angle (degrees).",
          "dataType": "sc:Float",
          "source": {
            "fileSet": {"@id": "sim-param-jsons"},
            "extract": {"jsonPath": "$.beta"}
          }
        }
      ]
    }
  ]
}