CGNS/SIDS - Standard Interface Data Structures

• 1. Introduction
• 2. Design Philosophy of Standard Interface Data Structures
  • 2.1. Implications of CFD Data Sets
  • 2.2. Topologically Based Hierarchical Database
  • 2.3. Additional Design Objectives
• 3. Conventions
  • 3.1. Data Structure Notation Conventions
  • 3.2. Structured Grid Notation and Indexing Conventions
  • 3.3. Unstructured Grid Element Numbering Conventions
    • 3.3.1. 1-D (Line) Elements
      • 3.3.1.1. Line (or bar)
        • 3.3.1.1.1. Linear and Quadratic Elements
        • 3.3.1.1.2. Cubic Elements
        • 3.3.1.1.3. Quartic Elements
    • 3.3.2. 2D (Surface) Elements
      • 3.3.2.1. Triangular Elements
        • 3.3.2.1.1. Linear and Quadratic Elements
        • 3.3.2.1.2. Cubic Elements
        • 3.3.2.1.3. Quartic Elements
      • 3.3.2.2. Quadrilateral Elements
        • 3.3.2.2.1. Linear and Quadratic Elements
        • 3.3.2.2.2. Cubic Elements
        • 3.3.2.2.3. Quartic Elements
    • 3.3.3. 3D (Volume) Elements
      • 3.3.3.1. Tetrahedral Elements
        • 3.3.3.1.1. Linear and Quadratic Elements
        • 3.3.3.1.2. Cubic Elements
        • 3.3.3.1.3. Quartic Elements
      • 3.3.3.2. Pyramid Elements
        • 3.3.3.2.1. Linear and Quadratic Elements
        • 3.3.3.2.2. Cubic Elements
        • 3.3.3.2.3. Quartic Elements
      • 3.3.3.3. Pentahedral Elements
        • 3.3.3.3.1. Linear and Quadratic Elements
        • 3.3.3.3.2. Cubic Elements
        • 3.3.3.3.3. Quartic Elements
      • 3.3.3.4. Hexahedral Elements
        • 3.3.3.4.1. Linear and Quadratic Elements
        • 3.3.3.4.2. Cubic Elements
        • 3.3.3.4.3. Quartic Elements
    • 3.3.4. Unstructured Grid Example
    • 3.3.5. Multizone interfaces
• 4. Building Block Structure Definition
  • 4.1. Definition DataClass_t
  • 4.2. Definition Descriptor_t
  • 4.3. Definition DimensionalUnits_t
  • 4.4. Definition DimensionalExponents_t
  • 4.5. Definition GridLocation_t
  • 4.6. Definition IndexArray_t
  • 4.7. Definition IndexRange_t
  • 4.8. Definition Rind_t
• 5. Data-Array Structure Definitions
  • 5.1. Definition DataArray_t
    • 5.1.1. Definition DataConversion_t
  • 5.2. Data Manipulation
    • 5.2.1. Dimensional Data
    • 5.2.2. Nondimensional Data Normalized by Dimensional Quantities
    • 5.2.3. Nondimensional Data Normalized by Unknown Dimensional Quantities
    • 5.2.4. Nondimensional Parameters
    • 5.2.5. Dimensionless Constants
    • 5.2.6. Data-Array Examples
      • 5.2.6.1. Example - One-Dimensional Data Array, Constants
      • 5.2.6.2. Example - Two-Dimensional Data Array, Pressures
      • 5.2.6.3. Example - Three-Dimensional Data Array, Nondimensional Static Enthalpy
      • 5.2.6.4. Example - Three-Dimensional Data Array, Nondimensional Database
      • 5.2.6.5. Example - Data Arrays for Reynolds Number
• 6. Hierarchical Structures
  • 6.1. CGNS Version
  • 6.2. CGNS Entry Level Structure Definition: CGNSBase_t
    • 6.2.1. Base Level Families
  • 6.3. Zone Structure Definition: Zone_t
  • 6.4. Precedence Rules and Scope Within the Hierarchy
    • 6.4.1. Single Base
    • 6.4.2. Multiple Bases
• 7. Grid Coordinates, Elements, and Flow Solution
  • 7.1. Grid Coordinates Structure Definition: GridCoordinates_t
  • 7.2. Grid Coordinates Examples
    • 7.2.1. Example - Cartesian Coordinates for a 2-D Structured Grid
    • 7.2.2. Example - Cylindrical Coordinates for a 3-D Structured Grid
    • 7.2.3. Example - Cartesian Coordinates for a 3-D Unstructured Grid
  • 7.3. Elements Structure Definition: Elements_t
  • 7.4. Elements Examples
    • 7.4.1. Example - TETRA_4 Element Types
    • 7.4.2. Example - NGON_n and NFACE_n Element Types
    • 7.4.3. Example - Separate Element Types
    • 7.4.4. Example - MIXED Element Type
  • 7.5. Axisymmetry Structure Definition: Axisymmetry_t
  • 7.6. Rotating Coordinates Structure Definition: RotatingCoordinates_t
  • 7.7. Flow Solution Structure Definition: FlowSolution_t
  • 7.8. Flow Solution Example
    • 7.8.1. Example - Flow Solution
  • 7.9. Zone Subregion Structure Definition: ZoneSubRegion_t
  • 7.10. Zone Subregion Examples
    • 7.10.1. Example - Volume Subregion for a Structured Grid
    • 7.10.2. Example - Volume Subregion for an Unstructured Grid
    • 7.10.3. Example - Surface Subregion for an Unstructured Grid
    • 7.10.4. Example - Surface Subregion Utilizing BC Information
• 8. Multizone Interface Connectivity
  • 8.1. Zonal Connectivity Structure Definition: ZoneGridConnectivity_t
  • 8.2. 1-to-1 Interface Connectivity Structure Definition: GridConnectivity1to1_t
  • 8.3. 1-to-1 Interface Connectivity Examples
    • 8.3.1. Example - 1-to-1 Abutting of Complete Faces
    • 8.3.2. Example - 1-to-1 Abutting, Complete Face to a Subset of a Face
  • 8.4. General Interface Connectivity Structure Definition: GridConnectivity_t
  • 8.5. General Interface Connectivity Examples
    • 8.5.1. Example - Structured Abutting Zones
    • 8.5.2. Example - Unstructured Abutting Zones, HEXA_8 Donor Cell
    • 8.5.3. Example - Unstructured Abutting Zones, TRI_3 Donor Cell
  • 8.6. Grid Connectivity Property Structure Definition: GridConnectivityProperty_t
    • 8.6.1. Periodic Interface Structure Definition: Periodic_t
    • 8.6.2. Average Interface Structure Definition: AverageInterface_t
  • 8.7. Overset Grid Holes Structure Definition: OversetHoles_t
• 9. Boundary Conditions
  • 9.1. Boundary Condition Structures Overview
  • 9.2. Zonal Boundary Condition Structure Definition: ZoneBC_t
  • 9.3. Boundary Condition Structure Definition: BC_t
  • 9.4. Boundary Condition Data Set Structure Definition: BCDataSet_t
  • 9.5. Boundary Condition Data Structure Definition: BCData_t
  • 9.6. Boundary Condition Property Structure Definition: BCProperty_t
    • 9.6.1. Wall Function Structure Definition: WallFunction_t
    • 9.6.2. Area Structure Definition: Area_t
  • 9.7. Boundary Condition Type Structure Definition: BCType_t
  • 9.8. Matching Boundary Condition Data Sets
  • 9.9. Boundary Condition Specification Data
  • 9.10. Boundary Condition Examples
    • 9.10.1. Example - Symmetry Plane
    • 9.10.2. Example - Viscous Solid Wall I
    • 9.10.3. Example - Subsonic Inflow
    • 9.10.4. Example - Outflow
    • 9.10.5. Example - Farfield
    • 9.10.6. Example - Viscous Solid Wall II
• 10. Governing Flow Equations
  • 10.1. Flow Equation Set Structure Definition: FlowEquationSet_t
  • 10.2. Governing Equations Structure Definition: GoverningEquations_t
  • 10.3. Model Type Structure Definition: ModelType_t
  • 10.4. Thermodynamic Gas Model Structure Definition: GasModel_t
  • 10.5. Molecular Viscosity Model Structure Definition: ViscosityModel_t
  • 10.6. Thermal Conductivity Model Structure Definition: ThermalConductivityModel_t
  • 10.7. Turbulence Structure Definitions
    • 10.7.1. Turbulence Closure Structure Definition: TurbulenceClosure_t
    • 10.7.2. Turbulence Model Structure Definition: TurbulenceModel_t
    • 10.7.3. Example - Spalart-Allmaras Turbulence Model
  • 10.8. Thermal Relaxation Model Structure Definition: ThermalRelaxationModel_t
  • 10.9. Chemical Kinetics Model Structure Definition: ChemicalKineticsModel_t
  • 10.10. Electromagnetics Structure Definitions
    • 10.10.1. Electromagnetics Electric Field Model Structure Definition: EMElectricFieldModel_t
    • 10.10.2. Electromagnetics Magnetic Field Model Structure Definition: EMMagneticFieldModel_t
    • 10.10.3. Electromagnetics Conductivity Model Structure Definition: EMConductivityModel_t
  • 10.11. Flow Equation Examples
    • 10.11.1. Example - 3-D Compressible Euler
    • 10.11.2. Example - 3-D Compressible Navier-Stokes
• 11. Time-Dependent Flow
  • 11.1. Iterative Data Structure Definitions
    • 11.1.1. Base Iterative Data Structure Definition: BaseIterativeData_t
    • 11.1.2. Zone Iterative Data Structure Definition: ZoneIterativeData_t
  • 11.2. Rigid Grid Motion Structure Definition: RigidGridMotion_t
  • 11.3. Arbitrary Grid Motion Structure Definition: ArbitraryGridMotion_t
  • 11.4. Zone Grid Connectivities
  • 11.5. Examples for Time-Dependent Flow
    • 11.5.1. Example - Rigid Grid Motion
    • 11.5.2. Example - Deforming Grid Motion
    • 11.5.3. Example - Adapted Unstructured Mesh
    • 11.5.4. Example - Combination of Grid Motion and Time-Accuracy
• 12. Miscellaneous Data Structures
  • 12.1. Reference State Structure Definition: ReferenceState_t
  • 12.2. Reference State Example
    • 12.2.1. Example - Reference State with Dimensional Data
  • 12.3. Convergence History Structure Definition: ConvergenceHistory_t
  • 12.4. Discrete Data Structure Definition: DiscreteData_t
  • 12.5. Integral Data Structure Definition: IntegralData_t
  • 12.6. Family Data Structure Definition: Family_t
  • 12.7. Geometry Reference Structure Definition: GeometryReference_t
  • 12.8. Family Boundary Condition Structure Definition: FamilyBC_t
  • 12.9. Family Boundary Condition Data Set Structure Definition: FamilyBCDataSet_t
  • 12.10. User-Defined Data Structure Definition: UserDefinedData_t
  • 12.11. Gravity Data Structure Definition: Gravity_t

• Appendix A: Conventions for Data-Name Identifiers
  • A1 Coordinate Systems
  • A2 Flowfield Solution
  • A3 Turbulence Model Solution
  • A4 Nondimensional Parameters
  • A5 Characteristics and Riemann Invariants Based on 1D flow
  • A6 Forces and Moments
  • A7 Time-Dependant flows
• Appendix B
  • B.1 Overall Layout
  • B.2 Grid Coordinates
  • B.3 Flowfield Solution
  • B.4 Interface Connectivity
  • B.5 Boundary Conditions
  • B.6 Global Reference State
  • B.7 Equation Description