CFD General Notation System
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• Your name
• Company, university, lab, or facility name (if applicable)
• Email, if different from your current sending address
• Intended use for CGNS

We also strongly recommend that you join the Discussion Group. This forum is the primary method used to keep CGNS users current with release and other important information updates. It is also used for discussing important problems/issues and for obtaining help from other CGNS users.

What to Download

• Current Stable Release: CGNS Version 3.1.4 (cgnslib_3.1.4.tar.gz)
  First release of Version 3.1.4 software. Includes 64-bit integer capability and updated Tools for viewing and editing CGNS files. HDF5 is now the default file type, when CGNS is built with HDF5 version 1.8 or later. (CGNS can always read or write both HDF5 and ADF file types.) Version 3.1.4 fixes some issues with goto for FamilyBCDataset for UserData, .etc; fixes cmake and configure scripts to allow MPI with HDF5 and some bugs in those scripts; updates CGNSplot to handle all element types and 1-d and 2-d cases; updates to cgnscheck; adds cgnsBuild.defs Makefile include to installation; allows CellCenter for BCs; and adds cg_precision and cg_precision_f functions to get integer size used to create the file (32 or 64).

  Note: CGNStools no longer built automatically, you need to set the configure flag, --enable-cgnstools if using configure.

• Current Beta Release: CGNS Version 3.2 beta (cgnslib_3.2.tar.gz)
  Beta release of Version 3.2 software. This release provides full integration of parallel I/O using HDF5 with MPI. It also implements the Hierarchy of families (CPEX 0033), Multiple families (CPEX 0034), and Cubic elements (CPEX 0036). Compression (rewriting) of modified CGNS files is no longer automatically done, since this may interfere with parallel I/O. This may be reenabled within an application with the cg_set_compress function, or done later through the CGNSview GUI or with the cgnscompress program in the tools subdirectory. Conversion programs to and from AFLR3, FAST, and TetGen have also been added to CGNStools.


• Previous Stable Release: CGNS Version 2.5-5 (cgnslib_2.5-5.tar.gz)
  Prior stable-release version. (This release fixes a long standing issue of memory leakage in the CGNS library when closing a file or deleting a node. It also removes the internal storage of element data when reading and writing, and uses the user supplied buffer instead. In the case of partial reads and writes however, the element data is currently reloaded into memory to do the operations.)

Also available from the SourceForge CGNS Files Download page:

• F77_examples - Fortran CGNS examples.
• UserGuideCode 3.1.2 - examples from the CGNS User Guide.
• Windows compiled html file (chm) documentation is available for Version 2.5, Version 3.1 and Version 3.2 of the CGNS library.
• Working SVN directories of development files, included source and documentation. (Note: older CVS repository is no longer being used.)

Other CGNS related software and older versions of the library are also available. (NOTE: if building CGNS with an HDF5 version earlier than 1.8, then links will not work when using HDF5 file type.)

Known Bugs in Latest Official Release

• None.