2023-1-10 Meeting notes

Date

10 Jan 2023, 10:00 AM EST (US)

Participants

In attendance

Steering Committee Issues

Note: Numeca (now Cadence) is looking for a new representative. Introduce David Garlisch.

Discussion topics

Item	Presenter	Notes
Approve 2022/10/11 minutes.	Scot Breitenfeld	post the last meeting’s minutes to the CGNS webpage.
high-level editing tools for the documentation page	Marc Poinot Christopher Rumsey	Help needed to divide the remaining tasks: https://github.com/CGNS/cgns.github.io/projects/1 The documentation goes into the source using Doxygen. This work uses the “Doxygen” branch. Examples are given for cg_open and cg_version. The aliases used for repeated variable descriptions are in src/Doxygen/Doxygen.config. We need volunteers to help with translating the remaining APIs to Doxygen. A link to the new website is provided on the main cgns web page: https://cgns.github.io/cgns-modern.github.io/index.html All the MLL APIs have Doxygen entries, the cgio APIs need to be done next. An automatic generation of the website through GitHub action is done. Still in progress.
Converting CGNSTalk archive to Github Discussion Posts	Scot Breitenfeld	Hope to be completed by next meeting. Still WIP.
New features being introduced	Scot Breitenfeld	subfiling, and multidataset updates.
Github Issues	Scot Breitenfeld	Discussion moving from Jira to GitHub issues to track code issues. Completed move to GitHub
Added UTF-8 support	Scot Breitenfeld	Should CGNS support UTF-8?
Coupled fluid-structure standard addition	Scot Breitenfeld	Working on proposal to standardized fluid-structure simulations.
Discussion Topic	ZJ Wang	Short discussion on past AMR CPEX (0008) and whether AMR should be revisited as a feature supported CGNS. Some groups may be already using CGNS with AMR, but not known for certain. The need for AMR support in CGNS is unknown. Vicky Moschou Tobias Leicht ZJ Wang to discuss progressing CPEX 0008. . CPEX 0008 / Adaptive Mesh Refinement: Again, we are very much interested in the topic and actively working on and with adaptation using element subdivision, leading to hierarchical representations of the mesh. Where I am unsure is whether there actually is a need to store this structure itself, i.e. essentially provide information of how to get from one mesh to another via adaptation. Any resulting mesh with hanging nodes can be represented just as is (e.g. as polyhedral). While I think that it could be beneficial to explicitly express the hanging node / hanging face connectivity (in order to allow to still recognize the elements as (for example) hexes with hanging nodes rather than just any polyhedron) I don’t think it would be overly useful to have the actual hierarchical information available in an archival /exchange format like CGNS. I don’t know what it would be used for outside of a specific code. But I’m certainly still very much interested in the actual discussion. If this is supposed to be a separate small group discussion (my current understanding), please invite me over… Tobias
Status update on Accepted CPEX #0045 CGNS-182 - Getting issue details... STATUS	Koen Hillewaert	The branch CPEX45_high_order has not been updated since Feb 25, 2020. An update from Koen Hillewaert on the status is needed. Scot Breitenfeld will get an update on the status. Regarding the two topics that I might want to say something on I have collected some input – feel free to use it (or not): CPEX 0045: We are still very much interested in this for our DG and DGSEM solution storage. We have been rather slow in adopting the proposed work in progress, though, and now that it has been quite a while since anyone touched things in CGNS I am a bit unsure whether it makes sense to push it now or wait for feedback on the status. We decided for the latter, so in the end I am waiting for Koen to provide feedback on the status of the branch and the way ahead. Please let me know if I am under the wrong impression that this was the agreed next step…
Discussion Topic	Mickael PHILIT	Proposal to have Monitoring numerical probes description to the standard. Some groups may already use CGNS to do that, but there is a need to have a shared approach. Committee needs to review the proposal and provide feedback. Scot Breitenfeld to send out a reminder. CGNS-272 - Getting issue details... STATUS No new updates.
Status update on Accepted CPEX #0047 Proposed Data integration Points	Mickael PHILIT	Working on the new website before creating a new development branch to prevent duplicating efforts. Started prototyping with python and C and will push a branch on GitHub in the upcoming weeks. (The “C” branch is a slow work in progress) No new updates.
prioritization, review and attribution of JIRA bugs/issues	Tony Garratt David Gutzwiller	Next release 4.4.0, Kanban: https://cgnsorg.atlassian.net/jira/software/c/projects/CGNS/boards/4 General Kanban Board: https://cgnsorg.atlassian.net/secure/RapidBoard.jspa?rapidView=3&projectKey=CGNS&selectedIssue=CGNS-190 Current status for Ansys: No issues that are urgent. We would like confirmation on the recommended build practice: autotools or cmake? Are both supported or just cmake? Scot Breitenfeld is working on updating the Multi-dataset APIs in CGNS to use the new array-based API and is testing CGNS with the new HDF5 subfiling feature.

A reminder that new CPEXs will have to address backward/forward compatibility before being voted on.

Action items from last meetings

Description	Assignee	Task appears on
Vicky Moschou and others will draft a document to discuss hardening the specification for faces in the case of mixed meshes.	Vicky Moschou	2024-7-9 Meeting notes
Scot Breitenfeld will follow-up with Gregory Sjaardema	Scot Breitenfeld	2024-7-9 Meeting notes
Vicky Moschou and others will draft a document to discuss hardening the specification for faces in the case of mixed meshes.	Vicky Moschou	2024-4-9 Meeting notes
Scot Breitenfeld will follow-up with Gregory Sjaardema	Scot Breitenfeld	2024-4-9 Meeting notes
Vicky Moschou and others will draft a document to discuss hardening the specification for faces in the case of mixed meshes.	Vicky Moschou	2024-1-16 Meeting notes
Scot Breitenfeld will follow-up with Gregory Sjaardema	Scot Breitenfeld	2024-1-16 Meeting notes
Scot Breitenfeld will follow-up with Gregory Sjaardema	Scot Breitenfeld	2023-10-3 Meeting notes
Scot Breitenfeld will define a task list or project plan with the remaining tasks.	Scot Breitenfeld	2023-7-11 Meeting notes
Scot Breitenfeld will define a tasks list or project plan with remaining tasks.	Scot Breitenfeld	2023-4-4 Meeting notes
Scot Breitenfeld will update the website to reflect the current state of the CPEX.	Scot Breitenfeld	2023-4-4 Meeting notes
Scot Breitenfeld Update the backward capability issues on the website.	Scot Breitenfeld	2023-4-4 Meeting notes
Mickael PHILIT will resend CPEX, please it review before the next meeting.	Mickael PHILIT	2023-4-4 Meeting notes
Vicky Moschou Tobias Leicht ZJ Wang to discuss it with interested parties before the next meeting.	Vicky Moschou	2023-4-4 Meeting notes
Scot Breitenfeld Will schedule discussion and vote for next meeting.	Scot Breitenfeld	2023-4-4 Meeting notes
Mickael PHILIT will resend CPEX, please it review before the next meeting.	Mickael PHILIT	2023-1-10 Meeting notes
Vicky Moschou Tobias Leicht ZJ Wang to discuss it with interested parties before the next meeting.	Vicky Moschou	2023-1-10 Meeting notes
Scot Breitenfeld Will schedule discussion and vote for next meeting.	Scot Breitenfeld	2023-1-10 Meeting notes
Scot Breitenfeld to update the web page.	Scot Breitenfeld	2022-3-29 Meeting notes
Scot Breitenfeld will follow-up with Koen Hillewaert to find out the status.	Scot Breitenfeld	2022-3-29 Meeting notes
Scot Breitenfeld will email committee an update, and Tobias Leicht may take over the discussion if needed.	Scot Breitenfeld	2022-3-29 Meeting notes

Decisions

Page Title	Decisions
2019-11-12 Meeting notes	BETA-CAE was added to the steering committee The cgio_read* will be dropped in the next release of the CGNS library.
2020-12-8 Meeting notes	Meeting notes Approved. Passed: move to Github discussions when it’s out of beta and retire the use of lists.nasa.gov. The notice should be posted to cgnstalk before the transition to discussions. Passed: Release all cgns.org documentation into the public domain.
2021-3-2 Meeting notes	Passed: move to Github discussions when it’s out of beta and retire the use of lists.nasa.gov. The notice should be posted to cgnstalk before the transition to discussions. Passed: Release all cgns.org documentation into the public domain.
2021-6-15 Meeting notes	Passed CPEX #0047
2021-9-7 Meeting notes	Approved to include in the CGNS’s example code.
2022-10-11 Meeting notes	Approved to move from Jira to GitHub issues.
2022-3-29 Meeting notes	Removal of CU-Boulder from Steering Committee (Thomas Hauser is now at NCAR). Passed
2023-7-11 Meeting notes	CPEX 0048 was approved with the understanding that the implementation would address the issues below with the Sample naming convention.

New Business

Any new CGNS funding proposal opportunities? Nothing was identified at the meeting.

NO UPDATES

Schedule next meeting