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 - 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 Summer School New Challenges in Turbulence Research VI 7th - 12th February 2021 - online meetings Location: Les Houches (near Chamonix) France Organiser: Mickael Bourgoin, Ecole Normale Supérieure, Lyon, France SIG: SIG35, PC France Henri Bénard7 Feb 2021
The Second Zoom Meeting on " Covid 19 Flows: Study and Practical Recommendations" 15th January 2021; 01:30 PM Paris Zoom Meeting: link ; ID: 927 4565 9217; Code: 781258 (Paris time, GMT+1) It is a follow up to the successful zoom meeting organised by ERCOFTAC Pilot Center Henri Benard on15 Jan 2021
Workshop on "Multiscale and directional approach to single-phase and two-phase flows" Location: Ecole Centrale de Lyon, France Date: 12th - 13th November 2020 POSTPONED !!! New date to be confirmed SIG: SIG35, SIG39, SIG50, PC Henry Bénard Organisers: Mikhael Gorokhovski ( LMFA,12 Nov 2020
ERCOFTAC SIG50 and SIG35 Workshop Turbulence and Instabilities in Plasma Flows 25th - 27th November 2019 Écully, France SCIENTIFIC SCOPE: Plasma flows are ubiquitous in nature – pervading the Earth’s environment through the interplanetary space – while hot and cold plasmas are operated25 Nov 2019
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