(CGNS Documentation Home Page)
(Steering Committee Charter)
(Overview and Entry-Level Document)
(A User's Guide to CGNS)
(Standard Interface Data Structures)
(SIDS-to-ADF File Mapping Manual)
(SIDS-to-HDF File Mapping Manual)
(ADF User's Guide)
(CGNS Tools and Utilities)
CGNS Steering Committee
24 August 2000
2:00pm Eastern Time
The meeting was called to order at 2:00 Eastern time.
There were 13 attendees, listed below.
The minutes of the 21 June were reviewed.
Steve Legensky asked that two discussion items be added to the
minutes: 1) We discussed version control and agreed on a new API
software release process where we release once per year, with a beta
release for new capabilities. 2) There was some discussion, with no
conclusion, about what is sufficient information to consider a file CGNS
compliant (additional discussion below). These items will be added to
the minutes. The minutes were then approved as amended.
- Steering Committee Nominations - The Sverdrup
representatives at AEDC indicated a willingness to represent the
Air Force on the Steering Committee. This will be included in the
discussion for the list of nominees to be presented at the end of
- ISO Status - There was a meeting to review the preliminary
ISO-STEP documentation which represents the migration of CGNS
into an international standard. The Steering Committee should
remain vigilant that the standards do not diverge. So far, it
seems that CGNS and the ISO standard can remain compatible. The
ISO-STEP proposal is due out for public comment in November. It is
hoped that the CGNS community will actively review and keep the
definitions from diverging.
- Documentation - Charlie Towne indicated that the SIDS has
been updated, and is almost ready for release. There was some
discussion about how to release the SIDS and API. It was decided
to create a beta release of the software, and to make the SIDS
documentation consistent with each release.
- Version 2.0 Beta 1: SIDS with all changes prior to grid motion
- Version 2.0 Beta 2: Add grid motion and time accurate
- Version 2.0 Beta 3: Add other extensions
In December, Version 2.0 Beta 3 will become the production version 2.0.
Chris Rumsey has written a draft User's Guide which is being
reviewed by Bob Bush and Diane Poirier. Ed Hall volunteered to
review the draft also.
Steve Legensky is working on an AIAA implementation paper. He will
be sending out a brief survey to get feedback on how and where
CGNS is being used. He is also collecting examples to demonstrate
interchangeability of the files. Potential volunteers with examples
include Ed Hall and Dave Schowalter. It was also mentioned
that the AIAA Drag Prediction Workshop might provide a good
demonstration of delivering grids, and potentially solutions, using
- Support - Don Roberts discussed his experiences with
Tecplot Talk, an e-mail forum we might use as a pattern for a
CGNS group. ListBot could manage the forum, potentially at no
charge. Diane will check into setting up a forum for CGNS.
There were no replies to inquiries for user support focal point.
- Hierarchical Structures - Michel Delanaye has submitted
a proposal. Very limited feedback to date (Diane). It is on
the web, and the deadline for comments is set for the end of
September so the implementation can begin.
- Chemistry - The proposal has been in review recently,
with minor mods incorporated. A revised version will
be posted on the web when the current reviewers are in
concurrence. Armen Darian has requested to be included in the
- Gravity, Axi-symmetry, Rotating Coordinates - Are ready
- Liquid Spray - Armen Darian has a draft in
circulation. Additional reviewers are needed. Steve Legensky
volunteered to review. Hope to have a proposal ready to post
- Hanging Nodes - No progress. Steve Legensky has
contacted Steve Karman and plans to discuss with M. Aftosmis.
- Wall Functions - Bob Bush will try to revive this
extension. Chris Rumsey, Ed Hall and Steve Legensky offered to
be on the review team.
- Turbomachinery Boundary Conditions - Bob Bush will try
to revive this extension also. No volunteers to review.
- Additional Items - It is difficult to interrogate and edit
a file. Ed Hall offered to look into acquiring utilities that
facilitate this. Diane Poirier will send a code that reads a file
and outputs its contents. It would also be nice to have an editing
capability, and a graphical user interface into the file. This
might allow creation of non-cgns compliant modifications to the
file. This also raises the possibility of a 'validator' which
checks for some set of minimal information required to make the
file 'compliant'. Francis Enomoto has looked at XML, which might be
useable as a CGNS browser since XML structures are similar to CGNS
structures. He will try to map the SIDS into an XML format.
Bob Bush will set up the next telecon for mid October, the next
meeting will take place at the AIAA conference in Reno in January.