The official CGNS web site, by extension any document on this web
site has an official taste...
The specific purpose of the
CFD General Notation System (CGNS)
project is to provide a standard for recording and recovering
computer data associated with the numerical solution of the
equations of fluid dynamics. See also the
The Standard Interface Data Structure is the
specification of the data model. This public document describes
the syntax and the semantics of all tree-structured data required
or proposed for a CFD simulation.
The Mid-Level Library
is an example implementation of
CGNS/SIDS on top of CGNS/ADF and CGNS/HDF5 mappings. This
library has a C and a Fortran API.