Typical structures in turbulent flows are vortices and waves. The first ones are immediatelyidentified in spatial ‘snapshots’, and are extensively studied in connection with organizedmotion interacting with unstructured motion. On the other hand, nonlocal waves need acomplete spatio-temporal analysis, if we exclude local quasi-stationary shocks (higly com-pressible turbulence and Burger turbulence will be not addressed.) In addition to acousticwaves, which affect weakly compressible flows in the near field (aroacoustics in the far field isoutside our scope), dispersive waves are triggered by external forces (Coriolis, buoyancy) ormean-gradient-effects (stable stratification, shear) in, e.g., quasi-incompressible geophysicalflows: Inertial waves, internal gravity waves, Rossby waves, Kelvin waves, and mixed ones.Even in the simplest case of weakly compressible turbulence, and in stably-stratified turbu-lence with buoyancy, wave and vortex modes are simultaneously present and can interact.
This theme is important from magnetohydrodynamics to plasma physics, but the diversityof wave motion, accounting for coupling with the magnetic field, is enhanced with respect tothe purely ‘hydro’ case, with Alfvèn-type waves and various drift waves. For instance, theLagrangian diffusion can be strongly altered by dispersive waves, so that waves can dominatethe capping of fluid trajectories (or real particles), that is generally attributed to vortexstructures in the ‘hydro’ community. Alteration of single-particle and two-particle diffusionby waves and vortices is therefore a common theme in ‘hydro’ (rather geophysics with waves)and plasmas communities.
Finally, faced with the recent fast development of wave turbulence theory, but more for sur-facic waves or vibrating plates, it is very important to made a state-of-the-art and to explorethe future of a generalized spectral theory, possibly incorporating linear ‘Rapid Distortion’operators and triadic closures. Applications range from engineering to astrophysics: Let usmention the rotating shear flow, which can be used as a model in turbomachinery (interbladechannel) and more recently in astrophysics (accretion discs). Of course, comparisons withDNS results and/or with simpler phenomenological theories/ models will be extensively discussed. Particularly, vortex and waves structures can coexist, introducing a new paradigm ofcoexistence and interaction of cascades in ‘weak’ and ‘strong’ turbulence.
Dates: du Lundi 20 Octobre 2014 au Mardi 21 Octobre 2014
Lieu: École Centrale de Lyon, Amphi 203
ERCOFTAC Workshop ASTROFLU VI 23rd - 24th May 2024 Ecole Centrale de Lyon, Ecully (near Lyon, France) Coordinators: Prof. Claude Cambon Organisers: PC Henri Bénard , SIG35, SIG14 , SIG50 / LMFA Aim: The aim of our new ASTROFLU VI workshop is to once again gather, mainly in
23 May 2024ERCOFTAC Course Computational Aeroacoustics, IV 26th - 27th March 2024 TU Wien, Building BA, Getreidemarkt 9, 1060 Wien, Austria Organizers: Dr Christophe Bogey, LMFA UMR 5509, Ecole Centrale de Lyon, France Prof Stefan Schoder, Institute of Fundamentals and Theory in
26 Mar 2024ERCOFTAC Workshop Turbulent Energy Transfer in Space Plasmas 29th - 31st August 2023 Ecole Centrale de Lyon in Écully - France https://turb-space.sciencesconf.org Description: The 99% of the visible universe is made of plasma, a gas of charged particles known as the "fourth
29 Aug 2023ERCOFTAC SIG35, SIG42, SIG50, SIG14, PC Henri Benard Modal Projection, Stochastic And Subgrid-Scale Modelling On Turbulent Flows Projection modale et modèles stochastiques pour les écoulements turbulents 22nd - 23rd May 2023 The CIRM, Luminy, near Marseille, France Preliminary programme
22 May 2023PC Henri Benard 5th Winter School 2023 on Multiscale Approaches and Multiphysic Couplings in Fluid and Solid Mechanics Registration now open! Date: 30th January - 3rd February 2023 Location: Grenoble, France Deadline for registration: 31st December 2022 Important societal
30 Jan 2023Call for Nominations: 20 th ERCOFTAC da Vinci Competition! Deadline for submission of nominations - 15th July 2025 The ERCOFTAC da Vinci Prize for young researchers is awarded annually in recognition of an excellent PhD thesis in fundamental or applied fluid dynamics and outstanding scientific
26 May 2025Iván Padilla-Montero accepted the award for the winning visualisation of the 1st Milton van Dyke Competition 2025. (from left: Prof Koen Hillewaert, KNC Deputy Chairman, Ivan Padilla-Montero, Dr Andrea Sciacchitano, KNC Chairman) The Winner of the 1st ERCOFTAC Milton van Dyke Competition
22 May 2025Call for Nominations: 1st ERCOFTAC Milton Van Dyke Flow Visualization Competition 2025 Inspired by the legendary “Album of Fluid Motion” by Prof. Van Dyke (Stanford University), ERCOFTAC will award from 2025 onward the Milton Van Dyke prize for the most inspiring, thought-provoking or simply most
17 Jan 2025Workshop "Turbulent Energy Transfer in Space Plasmas" organised by SIG50 with the support of SIG35 and Henri Bénard pilot centre took place on the 27th - 29th August 2023 at the École Centrale de Lyon, Écully, France. Local Organizing Committee: R. Marino (chair), E. Lévêque (chair), R. Foldes, H.
20 Mar 2024Call for Nominations: 18th ERCOFTAC da Vinci Competition - 15 July 2023 - Deadline for submission of nominations: PC coordinators send the selected 3 research summaries (PDF) to the SPC Chairman: maria.vittoria.salvetti@unipi.it The ERCOFTAC da Vinci Prize for young researchers is awarded
12 Jun 2023