The idea of the SIG was launched by Julian Hunt, after the successful PEPIT/ERCOFTAC workshop held in Ecole Centrale de Lyon, May 9-12, 2000, "Two-point closures and their applications" (see Godeferd, Cambon & Scott, J. Fluid Mech., 436, 2001, 393-407).
"Two-point closures" (or TPC), however, is perhaps too restricted a topic, and the range of activities of this SIG will in fact cover various multi-scale, anisotropic and multi-modal aspects, possibly in connection with strong body forces and mean gradients. Inhomogeneity, especially induced by solid walls, will be addressed too.
In addition to classic TPC used in statistical theory, linear theory ("Rapid Distortion Theory" or RDT, stability analysis), weakly nonlinear theory (e.g. wave-turbulence), low-dimension dynamical models (e.g. using pod), shell-models, Lagrangian models for dispersion (e.g. using Kinematic Simulation, or KS, RDT, nonlinear TPC), have to be considered from a pragmatic view-point, in order, for instance, to suggest guidelines to improve simpler models (single-point closures in RANS, subgrid scale models for LES).
Use of symmetry groups (Lie group, SO(3) ), in agreement with both dynamical equations and boundary layers, is very promising. The SO(3) symmetry group and spherical harmonic expansions, which begin to be used in the "intermittency and scaling" community, have to be revisited in connection with fully anisotropic spectral description used for two decades in the team "Ondes et Turbulence", LMFA. The above list of tools is not exhaustive.
The SIG 35: "Multi-point Turbulence Structure and Modeling" is currently focused on the following topics:
ERCOFTAC Workshop Cross-scale Energy Transfer in Space Plasmas 29th August 2023 - 1st September 2023 Ecole Centrale de Lyon, France Description: The 99% of the visible universe is made of plasma, a gas of charged particles known as the "fourth state" of the matter, in addition to the29 Aug 2023
ERCOFTAC SIG35, SIG42, SIG50, SIG14, PC Henri Benard Modal Projection, Stochastic And Subgrid-Scale Modelling On Turbulent Flows 22nd - 23rd May 2023 The CIRM, Luminy, near Marseille, France More details to be provided22 May 2023
Turbulence and Interface PC Henri Benard Workshop ORGANISERS: Mikhael Gorokhovski , Laboratoire de Mécanique des Fluides et d’Acoustique, École Centrale de Lyon Alfredo Soldati , Technische Universität Wien, Università di Udine Mickaël Bourgoin , Laboratoire de Physique, École Normale15 Jun 2022
ERCOFTAC Workshop ASTROFLU V 7th - 8th December 2021 Ecole Centrale de Lyon, amphi 203 Ecully (near Lyon, France) Coordinators: Prof. Claude Cambon and Prof. Tomas Bodnar Organisers: PC Henri Bénard , SIG35, SIG14 , SIG50 / LMFA Local scientific and organising committee7 Dec 2021
ERCOFTAC Workshop - SIG14 and SIG35 8th - 10th July 2021 The Centre IGESA on the Island of Porquerolles, Hyères, France Organization Committee: Tomas Bodnar, Czech Technical University in Prague Claude Cambon, Laboratoire de Mécanique des Fluides et d’Acoustique, Ecole Centrale Lyon Bérangère8 Jul 2021
ERCOFTAC workshop on Environmental Fluid Mechanics: Turbulence and Fluid Mixing took place on the 23rd - 24th of May 2022 at the Laboratoire de Mécanique des Fluides de Lille, Université de Lille, France. It was particularly special event as it was dedicated to Jose Manuel Redondo who passed away20 Jun 2022
Workshop "Onset of Turbulence and Singular Flows" organised by Henri Benard Pilot Centre , SIG14 , SIG35 took place on the 7th - 10th July 2021 at IGESA, Porquerolles Island, France. The workshop was first motivated by two very recent studies: the first one is by Berangere Dubrulle and23 Jul 2021
Recordings from zoom meeting on Covid 19 Flow Physics which took place on Friday 13/11/2020 are now available to watch. Zoom meeting was organised by professor Mikhael Gorokhovski from Ecole Centrale in Lyon, France in collaboration with professor Carlo Massimo Casciola from Sapienza Università di3 Dec 2020
The new issue of ERCOFTAC Bulletin has been released ! Table of contents is available here1 Aug 2019