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 are organizing a workshop to bring together experimentalist and theorists to share ideas about  interpretation  of currently available experimental measurements, and working out ways for the most effective experiments in future, e.g. using hot wires, pitot tubes, secound sound, cantilevers, vortex scattering, PIV and PTV.

The workshop will be organized around the following questions, which will be reviewed and discussed in depth.

·      Models of superfluid: two fluid model, Bio-Savart, Schwartz, Gross-Pitaeivski;

·      Measurements in superfluids:  pitot, hot-wire, second-sound, ions, lagrangian;

·      Quantum vs classical turbulence: spectra, structure functions, cascades, …

·      Transition to turbulence;

·      Dissipation processes: mutual friction, drag, reconnection, Kelvin waves.

The morning session will be devoted to review of the present understanding about the general topics. For this morning session, we invite the participants to submit an abstract about themes relevant to the general topics reviewed.

To maximize the outcome of the workshop the whole afternoons will be devoted to discussions and organized as follows.  The participants will be invited to present additional short talks (~10mn) not on results but on questions they would like to discuss during the meeting. These short talks session aims at initiating focused group discussions. The interplay between theoreticians/numericians and experimentalist will be sought: if possible, theoreticians/numericians should think about questions to experimentalist and vice-versa. Example: What is the best way to measure the mean line density profile and line-density spectra in homogeneous turbulent flow? or What quantity/equation shall I measure/simulate to test such and such aspect of your theory/measurement? (etc etc)

For the afternoon session, the participants are thus required to submit a special format of abstract, in which they should (i) introduce the context of their question; (ii) formulate their question, (iii) argue why they believe it is important and relevant to the field.