Interpretation of measurements in 4He superfluid turbulence
PALM Workshop, CEA, Saclay, France, September 14 – 18, 2015
Superfluid turbulence is hard : measurements are few and difficult to interprete. For example, hot-wire is routinely used to measure velocity in classical turbulence, but in superfluid, it produces a counter-flow that impedes direct interpretation of data. Theories are currently predicting things that are very far from experimental measurements. We have organized a workshop to put together experimentalist and theorists, to try and do an interpretation of currently available experimental measurements : hot-wire, pitot tubes, secound sound, cantilever, vortex scattering, PIV, PTV,..
Monday, 14 September
| 9.30 – 10.30 | Arrival, registration |
| 10.30 – 12.30 | Tour to the experimental facilities |
| 12.30 – 2.00 | Lunch |
| 2.00 – 2.10 | Welcome and announcements from the organizers |
| 2.10 – 2.50 | Carlo F. Barenghi Spectral properties of superfluid turbulence |
| 2.50 – 3.30 | Eleonore Rusaouen. Micro-machined cantilever anemometer: Measurements in cryogenic turbulence. |
| 3.30 – 5.30 | Discussion session 1. What questions do we want asked at this workshop? Chairman: Victor L�vov. |
Tuesday, 15 September
| 9.30 – 10.10 | Simone Babuin Recent results obtained with the Prague second-sound attenuation technique applied to therm ally and mechanically driven channel flows |
| 10.10 – 10.50 | Wei Guo Simultaneous study of the normal and superfluid in couterflowing superfluid |
| 10.50 – 11.10 | Coffee |
| 11.10 – 11.50 | Joe Vinen The decay of counterflow turbulence in superfluid 4He. |
| 11.50 – 12.30 | Victor S. L’vov Dynamics of the Density of Quantized Vortex-Lines in Superfluid Turbulence |
| 12.30 – 2.00 | Lunch |
| 2.00 – 2.50 | Y. A. Sergeev Imaging quantum turbulence in 3He-B: Do spectral properties of Andreev reflection reveal properties of turbulence? |
| 2.50 – 3.10 | Bob Kerr Approach and separation of quantum vortices with balanced cores |
| 3.10 – 3.30 | Davide Faranda Statistical and dynamical tools to study superfluid turbulence |
| 3.30 – 5.30 | Discussion session 2 How and what do we measure? Part A. Chairman: Ladik Skrbek. |
Wednesday, 16 September
| 9.30 – 10.10 | Andrei Golov The use of injected ions to probe and force vortex tangles and vortex arrays in superfluid helium |
| 10.10 – 10.50 | Yoshiyuki Tsuji Lagrangian property of particle motions in He4 ; comparison with classical turbulence |
| 10.50 – 11.10 | Coffee |
| 11.10 – 11.50 | Makoto Tsubota Review of numerical works of thermal counterflow – Route to inhomogeneous quantum turbulence |
| 11.50 – 12.30 | Ladislav Skrbek Recent Results on Quantum Turbulence in 4He Obtained Using Visualization and Oscillating Objects in Prague |
| 12.30 – 2.00 | Lunch |
| 2.00 – 2.40 | Viktor Tsepelin Turbulent drag on quartz tuning forks in superfluid 4He |
| 2.40 – 3.00 | Luca Galantucci Coupled normal fluid and superfluid profiles in turbulent helium II counterflows |
| 3.00 – 3.20 | Philippe Roche The T1 transition in counterflow: puzzle and geometrical artifact |
| 3.30 – 5.30 | Discussion session 3 How and what do we measure? Part B. Chairman: Philippe Roche |
Thursday, 17 September
| 9.30 – 10.10 | E. Leveque Large-scale vortical motions in thermal counterflow around an obstacle |
| 10.10 – 10.50 | Andrew Baggaley Coherent laminar and turbulent motion of toroidal vortex bundles in superfluid helium |
| 10.50 – 11.10 | Coffee |
| 11.10 – 11.50 | Luiza Kondaurova Dynamics of intense heat pulses interacting with vortices they generate in He-II. The Vinen�s equation |
| 11.50 – 12.30 | Sergey K. Nemirovskii Experimental and numerical suggestions based on the theoretical models. |
| 12.30 – 2.00 | Lunch |
| 2.00 – 2.40 | Vladimir .B. Eltsov Observation of turbulence of inertial and Kelvin waves in superfluid 3He-B |
| 2.40 – 3.20 | Sergey Nazarenko Superfluid turbulence near the intervortex scale |
| 3.30 – 5.30 | Discussion session 3 Future of research in superfluid turbulence. Chairman: Joe Vinen. |
Conference dinner
Friday, 18 September
| 9.30 – 10.10 | Giorgio Krstulovic Some recent results on low temperature quantum turbulence |
| 10.10 – 10.30 | Jason Laurie Effectiveness of small-scale energy transfer mechanisms in zero temperature superfluid turbulence |
| 10.30 – 10.50 | Dmytro Khomenko Analytic Solution of the Approach of Quantum Vortices Towards Reconnection |
| 10.50 – 11.10 | Coffee |
| 11.10 – 11.50 | Marc Brachet Self-truncation and scaling in Euler-Voigt-α and related fluid models |
| 11.50 – 12.30 | Laurent Chevillard Internal structure of vortices in superfluids and implications for quantum turbulence |
| 12.30 – 12.40 | Concluding remarks |
| 12.30 – 2.00 | Lunch |
Singularity and Irreversibility
Programm of the day Day : « Singularity and Irreversibility » at CEA Saclay
- Mercredi 16 Octobre 2019
- SPEC, L’Orme des Merisiers
- Batiment 772, 2eme étage, pièce 206
Sponsored by the label PALM
| 9:30-10:00 | Arrival, welcome coffee room 206 Batiment 772 |
| Then, move to room 135 Batiment 772 for talks |
|
| 10:00-10:30 | B. Dubrulle Opening and introduction |
| 10:30-11:15 | J. Guillod Non-uniqueness and self-similar blow-up for a model equation |
| 11:15-12:00 | A.A. Mailybaev Chaotic blow-up scenarios in models and DNS |
| 12:00-13:30 | Lunch (Buffet) room 206 Batiment 772 |
| Then, move to room 135 Batiment 772 for talks | |
| 13:30-14:15 | Y. Pomeau Leray singularities and intermittency in turbulent flows |
| 14:15-15:00 | Ch. Josserand Singularity Turbulence |
| 15:00-15:45 | S. Chibbaro : Extreme event of inertial kinetic and thermal dissipation in convective flow |
| 15:45-16:30 | S. Galtier: Turbulence and irreversibility in fluids and plasma |