Skip navigation links
(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) (Mid-Level Library) (ADF User's Guide) (CGNS Tools and Utilities)

CGNS Steering Committee

Telecon Minutes

16 March 2000
2:00pm Eastern Time

The meeting was called to order at 2:00 Eastern time. There were 18 attendees, listed below.

Bob Bush reviewed the minutes from the January meeting, noting that they have been posted on the web. Having no comments, the minutes were approved as posted. Bob also noted that following the January meeting, a presentation was made to the AIAA CFD Committee on Standards proposing to affiliate with that organization. The proposal was accepted, and we are now a sub-committee of this organization.


   Bob Bush   UTRC
Stuart Ochs ADAPCO
Steve Feldman ADAPCO
Dan Dominik Boeing Rocketdyne
Armen Darian Boeing Rocketdyne
Barb Hutching Fluent Inc.
Michel Delanaye NUMECA
Bill Thompson ?
David Kenwright NASA Ames
Steve Karman Lockeed
David Edwards Intelligent Light
Steve Legensky Intelligent Light
Mark Fisher Boeing St-Louis
Ray Cosner Boeing St-Louis
Todd Michael Boeing St-Louis
Mori Mani Boeing St-Louis
Andreas Wierse Vircinity
Diane Poirier ICEM CFD Engineering

Intelligent Light's CGNS Effort

Report from NUMECA

Subject: NUMECA input


I thought you would be interested to get something written about what I said during the last teleconference. So, NUMECA is adopting the CGNS format as the only data transfer system between its different products, IGG (multi-block structured grid generation), Euranus (multi-block structured flow solver), CFView (postprocessing, visualization).

So far, the grid coordinates are written in the data base, the topology is still stored in our own format, but we are progressively changing to CGNS for the complete set of information, connectivity, boundary conditions, etc. This should be completed fairly soon. The flow solver outputs solutions in the CGNS database, and the database can be read by CFView. For unsteady computations, solutions at different time steps are stored for the moment in a different file. The CGNS will be part of the next release of these products, i.e. end of March.

We have proposed the use of CGNS in two European research projects. The CGNS format has been adopted in the first one, HPNURSA, to study unsteady flows in turbomachinery. Partners in this project are TaskFlow, SIMULOG which is writing a CGNS reader for Ensight, SEP, HYRDO-Vevay, EPFL and Ecole Centrale de Lyon. In the second one, ESTEDI, we proposed to test the CGNS format as a possible way to store data in a very large data base which is intended for data posttreatment (data mining) for large scientific computations (Climate modeling, Cosmology, Satellite tracking, LES, etc).

I mentioned some problems regarding speed. Further investigation on our side has highlighted some bad usage which has been corrected since. I also mentioned our wish to be able to store quantities on block boundaries. The Boeing proposal will most propably meet our expectations. The last comment was about the ability to store our hierarchal hexahedral unstructured grids. On this matter, I am going to investigate different possibilities and probably contact Diane with some propositions.

Hope this will help,


Dr. Michel Delanaye
NUMECA International
Av. Franklin Roosevelt 5
B-1050 Brussels
Tel: +32 2 647.83.11 (main) ext 824
+32 2 642.28.24 (voice mail)
Fax: +32 2 647.93.98