Final report

Dates and location

30 August — 1 September 2021, Poitiers France

Chairperson

Peter Jordan

Co-chairperson

Lutz Lesshafft

Conference fees

Student registration fee: 90.00 €
Online attendance registration fee: 30.00 €
Regular registration fee: 330.00 €

What other funding was obtained?

No other funding received.

What were the participants offered?

- Reception at Hôtel de Ville, Poitiers: welcome address by Madame La Maire, Léonore Moncond'huy; a performance by a duet from the Orchestre des Champs Elysées; cocktail.

- Three days of scientifique presentations and round-table discussion, in hybrid format (29 in-person participants; 25 video-conf).

- Three lunches at restaurants in the center of Poitiers.

- 1 colloquium dinner at Château de Dissay.

Applicants (members)

Christophe Bogey
André Cavalieri
Tim Colonius
David Fabre
Jerome Huber
Vincent Jaunet
Peter Jordan
Franck Kerhervé
Lutz Lesshafft
Jean-Christophe Robinet
Daniel Rodriguez
Aaron Towne

Applicants (non members)

Mohammed Afsar
Filipe Amaral
Mateus Avanci
Daniel Bodony
Clément Caillaud
Sergey Chernyshev
Quentin Chevalier
Chloe (Haeyoung) Choi
Daniel Edgington-Mitchell
Georgy Faranosov
Xavier Garnaud
Flavio Giannetti
Vasily Gryazev
Lehnasch Guillaume
Liam Heidt
Thomas Ludwig Kaiser
Hasan Kamliya Jawahar
Sergey Karabasov
Ugur Karban
Xiangru Li
Annabel Markesteijn
Eduardo Martini
Theo Mouyen
Elnaz Naghibi
Akhil Nekkanti
Petronio Nogueira
Kilian Oberleithner
Ravee Pathya
Ethan Pickering
Grégoire Pont
Robin Prinja
Oliver Schmidt
Javier Sierra Ausin
Michael Stavropoulos
Christopher Tam
Vincent Valeau
Mathieu Varé
Chuhan Wang
Marcus Wong
Mikhail Yudin
Bruno Zebrowski

Scientific report

SCIENTIFIC SUMMARY:

Jet noise modelling and control efforts, now more than ever, are largely based on hydrodynamic instability theory, informed by the analysis of experimental and numerical data. In particular, the strong predictive capacity of so-called linear resolvent analysis, and its link to spectral proper orthogonal decomposition of flow data, has been much investigated over the last five years, and these developments have been showcased in many presentations at our colloquium. It is noteworthy that these tools and concepts, recent as they are in the academic community, are already employed in industrial research and development. Participating colleagues from industry played an active role in the presentations and discussions, and provided valuable guidance in the formulation of future development objectives.

Most leading academic research groups from the field were represented by a total of 54 participants at the colloquium. 23 of all participants were PhD students or postdocs, 3 were industrial R&D engineers. Participants came from institutions in France, Germany, Spain, Italy, UK, Russia, China, USA, Brazil and Australia. 25 participants joined the colloquium by video conference, due to travel or personal restrictions. For nearly all participants that were physically present, the colloquium was the first in-person scientific event since the start of the pandemic, and this occasion was enthusiastically appreciated.

38 oral presentations of 20 minutes each were given over the three days of the colloquium, 16 of these by participants connected from afar. Two round-table discussions of about one hour each were held on the topics "How have streaks changed the jet-noise modelling paradigm?" and "Towards non-linear dynamic modelling of jets and their sound". These two featured subjects were indeed at the center of many contributions; other recurring topics included the estimation of unknown flow data, the modelling of long-range flow resonance dynamics, and the understanding of aerodynamic sound sources.

TECHNICAL ORGANISATION OF THE HYBRID FORMAT:

The video conference technology was provided by the University of Poitiers: this included the audio/video hardware in the conference room, the hosting of the Webex video conference on the University's servers, the software license, and the technical support. All these services functioned reliably, and they allowed us to fully integrate our virtually present colleagues into the plenary presentations and discussions, including the two round-table sessions.
A private contractor, Triumph SRL, added an additional layer to the login process. To our great disappointment, this contractor did not provide any service of value for our colloquium. To the contrary, the involvement of Triumph SRL generated a good deal of extra work for the organisers, and confusion for our participants, in addition to a hefty bill. We regret that 2500€ from our colloquium budget were paid to Triumph SRL, in exchange for no added value, and with a license for them to use our participants' personal data for promotional purposes.

Number of participants from each country

Country	Participants
France	21
United States	9
United Kingdom	6
Australia	5
Russia	3
Germany	3
Brazil	2
Italy	2
China	1
Spain	1
Total	53