Euromech 589 : turbulent cascade II

Most environmental and industrial flows are turbulent. The efficient modeling of such flows depends on the understanding of the turbulent cascade, i.e., the transfer of kinetic energy between different length scaes. This colloquium focuses on the universal features of the turbulent cascade in a wide range of flows, and in the presence of different types of external forces. In 1941, Kolmogorov proposed a theory that is justified only in the simplest of situations.

In particular, we will discuss turbulent cascades in multi-phase flows, superfluid-, and non-Newtonian flows. Flows in the presence of shear or unsteady forcing, or influenced by body-forces (Coriolis- and Lorentz-forces, buoyancy effects) and compressibility, or modulated through the finite size of solid particles, drops and bubbles, as well as through wavy structures of the gas/liquid interface and its surface tension, will all be considered.

The colloquium will bring together scientific experts from the weather-forecasting, applied mathematics, hydrodynamics and geophysics communities in order to progress together on the understanding and modeling of the common feature of all these flows: the turbulent cascade.

Dates

du mardi 5 au jeudi 7 décembre 2017

Lieu

École centrale de Lyon, Écully

Inscriptions et site web

Euromech 589 : turbulent cascade II

Programme

Tuesday, december 5th

• 8:15-8:40 Registration and welcome coffee

• 8:40-9:00 Opening:

Welcome and opening remarks
Mikhael Gorokhovski (on behalf of the Organizing Committee)

Inaugural words
Jean-Pierre Bertoglio (Scientific Director, Ecole Centrale de Lyon)

9:00-18:00 Multi-scales interactions and non-stationary cascades: physics, models and tools

9:00-10:00 Chairman: Fabien Godeferd

• 9:00-9:30 Javier Jimenez (Universidad Politécnica de Madrid, Spain) The turbulent cascade as unsteady process

• 9:30-10:00 Christos Vassilicos (Imperial College, London, UK) Inhomogeneous turbulence cascades in periodic turbulence

10:00-10:30 Refreshment Break

10:30-12:30 Chairmain: Joachim Peinke

• 10:30-11:00 Charles Meneveau (Johns Hopkins University, USA) A multiple-time scale, Navier-Stokes based Lagrangian model for the velocity gradient tensor and intermittency

• 11:00-11:30 Alain Pumir (Ecole Normale Supérieure de Lyon, France) Extreme events in turbulent flows at very high Reynolds numbers

• 11:30-12:00 George Haller (ETH Zürich, Switzerland) Material barriers to diffusive transport

• 12:00-12:30 Pierre Sagaut (Université d’Aix-Marseille, France) Anomalous fast decay regimes in isotropic turbulence

12:30-14:00 Lunch

14:00-16:10 Chairmain: Wouter Bos

• 14:00-14:30 Martin Oberlack (Technische Universität Darmstadt, Germany) Does the statistics of 2D turbulence admit the conformal group – answers to an old conjecture

• 14:30-15:00 Joseph Mathew (Indian Institute of Science, Bangalore, India) Evolution of local structure of turbulent flow along pathlines

• 15:00-15:20 Aurore Naso (Ecole Centrale de Lyon, France) Dual cascades in axisymmetric turbulence

• 15:20-15:50 Guido Boffetta (Università di Torina, Italy) The Rayleigh-Taylor turbulence

• 15:50-16:10 Laurent Chevillard (Ecole Normale Supérieure de Lyon, France) A multifractal model for the velocity gradients dynamics in turbulent flows

16:10-16:40 Refreshment Break

16:40-18:00 Chairman: Claude Cambon

• 16:40-17:00 Patricio Clark Di Leoni (Università di Roma “Tor Vergata”, Italy) Taming turbulence via spectral nudging

• 17:00-17:20 Joachim Peinke (Universität Oldenburg, Germany) A rigorous entropy law for the turbulent cascade

• 17:20-17:40 Alberto Vela-Martín (Universidad Politécnica de Madrid, Spain) The structure of information entropy production in the turbulence cascade

• 17:40-18:00 Antoine Briard (Institut Jean-Le-Rond-d’Alembert, Paris, France) Decay and statistics of helicity in skew-isotropic turbulence

18:00-19:30 Welcome cocktail combined with posters session

Wednesday, december 6th

8:30-10:30 Presence of free gas/liquid interface.

Chairman: Mikhael Gorokhovski

• 8:30-9:00 Olivier Desjardins (Cornell University, USA) Interactions between Turbulence and Interfaces with Surface Tension.

• 9:00-9:30 Marcus Herrmann (Arizona State University, Tempe, USA) A Dual Scale Approach for Modeling Turbulent Liquid/Gas Phase Interfaces

• 9:30-10:00 Frédéric Moisy (Université Paris-Sud, France) Imprint of a turbulent boundary layer over a free surface

• 10:00-10:30 Stephane Zaleski (Institut Jean-Le-Rond-d’Alembert, Paris, France) Turbulent two-phase mixing layers

10:30-11:00 Refreshment Break

11:00-12:30 Turbulence under “active” particles.

Chairman: Pablo Mininni

• 11:00-11:30 Toshiyuki Gotoh (Nagoya Institute of Technology, Japan) Cloud turbulence and droplets.

• 11:30-12:00 Rodney Fox (Iowa State University, Ames, USA) Cluster-Induced Turbulence in Particle-Laden Flow

• 12:00-12:30 Frederic Risso (IMFT, Toulouse, France) Bubble-induced turbulence

12:30-14:00 Lunch

14:00-16:00 Turbulence under “active” particles.

Chairman: Mickael Bourgoin

• 14:00-14:30 Jérémie Bec (Observatoire de la Côte d’Azur, France) Scaling laws in dusty turbulence

• 14:30-15:00 Eric Climent (IMFT, Toulouse, France) Modulation of turbulence in wall-bounded shear flows by finite size particles

• 15:00-15:20 Remi Zamansky (IMFT, Toulouse, France) Turbulent cascade and broadband forcing in thermal convection driven by heated particles

• 15:20-15:40 Arakel Petrosyan (Space Research Institute of the Russian Academy of Sciences, Moscow, Russia) Large-scale structures in a turbulent fluid with solid particles and with gas bubbles

• 15:40-16:00 Leonardo Primavera (Università della Calabria Rende, Italy) Parametric instability and turbulent cascades in space plasmas

16:00-16:30 Refreshment Break

16:30-17:40 Compressibility - turbulence; turbulence - atomization.

Chairman: Martin Oberlack

• 16:30-17:00 Alexei G. Kritsuk (University of California, San Diego, USA) Cascades and scaling in two-dimensional compressible turbulence

• 17:00-17:20 Sergei Chefranov (Obukhov Institute of Atmospheric Physics, RAN, Moscow, Russia) Exact Time-Dependent Solution to the Three-Dimensional Euler-Helmholtz and Riemann-Hopf Equations for Vortex Flow of a Compressible Medium

• 17:20-17:40 Amirezza Movaghar (Chalmers University of Technology, Göteborg, Sweden) Assessment of a One-Dimensional Turbulence Atomization Model using Direct Numerical Simulation of Multiphase Homogeneous Isotropic Turbulence

17:40-18:10 Posters

• 19:00 Departure for the Gala dinner (by bus)