This diagram illustrates the layout of the relevant parts of the CGNS file for nondimensional data with an arbitrary reference state.

The base node of the CGNS database (just below the root node of the ADF file) has the following characteristics.

• Name: Base
  Label: CGNSBase_t
  Data: CellDimension=3, PhysicalDimension=3

Just below the CGNSBase_t node are multiple nodes, with the following two nodes shown in detail.

• Name: ReferenceState
  Label: ReferenceState_t
  Data: MT
• Name: DataClass
  Label: DataClass_t
  Data: NormalizedByUnknownDimensional

Below the ReferenceState_t node are multiple nodes, with the following three nodes shown in detail.

• Name: ReferenceStateDescription
  Label: Descriptor_t
  Data: ReferenceQuantities
• Name: Mach
  Label: DataArray_t
  Data: 4.6
• Name: Density
  Label: DataArray_t
  Data: 1.0

Finally, below the DataArray_t node defining the Mach number, is:

• Name: DataClass
  Label: DataClass_t
  Data: NondimensionalParameter