11th Workshop on Synthetic Turbulence Models

  29th and 30th June 2015,

Ecole Centrale de Lyon, Eculy, France

Synthetic flow structure – clustering and modelling

Dr C. Cambon
LMFA Ecole Centrale de Lyon, Ecully France

Dr F. Nicolleau of Sheffield, Sheffield Fluid Mechanics, SFMG - Department of Mechanical Engineering, Sheffield, United Kingdom

Dr T. Michelitsch
michel@lmm.jussieu.frInstitut Jean le Rond d'Alembert, CNRS UMR 7190Université Pierre et Marie Curie (Paris 6), Paris, France

Conference Program: Preliminary talks & programme: please contact the organiser if you would like to give a talk

C. Cambon, LMFA, Ecole Centrale de Lyon, Ecully, FranceTBAT.

Michelitsch, G. Maugin, F. Nicolleau and A.F. Nowakowski, Université Pierre et Marie Curie, Institut Jean le Rond d'Alembert, Paris, FranceTBAF.

Nicolleau, Sheffield Fluid Mechanics Group, University of Sheffield, UK

Inertial particle clustering in 3D KS (TBC)

N. M. Sangtani Lakhwani, F. C. G. A. Nicolleau and W. Brevis, Sheffield Fluid Mechanics Group, University of Sheffield, UK

Vortex generation after a fractal cluster

J. C. Vassilicos, Imperial College, London, UK TBA

Audience:This conference on synthetic turbulence organised byERCOFTAC/SIG 42 is open to anyone interested in flow modellingand/or "synthetic turbulence" including (but not restricted to)Kinematic Simulation, (KS hereinafter).
More fundamental talks on particle dispersion in turbulent flows or fluid dynamics are also welcome.


KS is widely used in various domains, including Lagrangian aspects inturbulence mixing/stirring, particle dispersion/clustering, and last butnot least, aeroacoustics. Flow realisations with complete spatial, andsometime spatio-temporal, dependency, are generated via superposition ofrandom modes (mostly spatial, and sometime spatial and temporal,Fourier modes), with prescribed constraints such as: strictincompressibility (divergence-free velocity field at each point), highReynolds energy spectrum, ... Recent improvements consisted inincorporating linear dynamics, for instance in rotating and/orstably-stratified flows, with possible easy generalisation to MHD flows,and perhaps to plasmas. KS for channel flows have also been validated. However, the absence of "sweeping effects" in present conventional KS versions is identified as a major drawback invery different applications: inertial particle clustering as well as in aeroacoustics. Nevertheless, this issue was addressed in some referencepapers, and merits to be revisited in the light of new studies in progress. A further goal of this conference is to bring people from differentdisciplines together. In particular recent emerging fractal approacheshave the potential to provide the framework for the construction of new synthetic turbulent flows. Interdisciplinarycontributors are especially invited to contribute.

A non-exhaustive list of related topics can be proposed as follows: - Synthetic models of turbulence (KS and others),- Lagrangian aspects of turbulence, -Vortex dynamics and structure formation, - Particle dispersion/clustering, - Vorticity and multiphase flows, - Vortex methods, - DNS/LES and related techniques,- turbulent flows and multiscale (fractal) shapes, ...
Participants (preliminary): C. Cambon, Ecole Centrale de Lyon, France T. Michelitsch, Université Pierre et Marie Curie, Institut Jean le Rond d'Alembert, Paris, France F.C.G.A. Nicolleau, University of Sheffield, Sheffield Fluid Mechanics Group, UK A. F. Nowakowski, University of Sheffield, Sheffield Fluid Mechanics Group, UK N. Sangtani-Lakhwani, University of Sheffield, Aerodynamics Group, UK J.C. Vassilicos, Imperial College London, UK