Organisation

Co-organizer (local): Dr A. Nowakowski
A.F.Nowakowski@sheffield.ac.uk
University of Sheffield, Sheffield Fluid Mechanics, Department of Mechanical Engineering
Mappin Street
Sheffield S1 3JD, United Kingdom　

Co-organizer (local): Dr K. Bajer
Konrad.Bajer@fuw.edu.pl
University of Warsaw,
Institute of Geophysics
ul. Pasteura 7
02-093 Warsaw Poland

Co-organizer (local): Pr J. Rokicki
Professor Jacek Rokicki
Institute of Aeronautics and Applied Mechanics
Warsaw University of Technology
24 Nowowiejska Street
00-665 Warsaw

Co-organizer: Dr C. Cambon
Claude.Cambon@ec-lyon.fr
Ecole Centrale de Lyon, LMFA,
36 avenue Guy de Collongue - BP 163,
69131, Ecully CEDEX, France　

Co-organizer: Dr F. Nicolleau
F.Nicolleau@sheffield.ac.uk
University of Sheffield Department of Mechanical EngineeringMappin StreetSheffield S1 3JD, United Kingdom

Audience:
This workshop will be the fifth on Synthetic turbulence organised by ERCOFTAC/SIG 42 it will be coorganised by ERCOFTAC/SIG 35.

It is open to anyone interested in vortex methods or "synthetic turbulence" including the so-called Kinematic Simulation, (KS hereinafter).

More fundamental talks on particle-laden flows are also welcome.　

Motivation:
KS is widely used in various domains, including Lagrangian aspects in turbulence mixing/stirring, particle dispersion/clustering, and last but not least, aeroacoustics. Flow realisations with complete spatial, and sometime spatio-temporal, dependency, are generated via superposition of random modes (mostly spatial, and sometime spatial and temporal, Fourier modes), with prescribed constraints such as: strict incompressibility (divergence-free velocity field at each point), high Reynolds energy spectrum, ... Recent improvements consisted in incorporating linear dynamics, for instance in rotating and/or stably-stratified flows, with possible easy generalisation to MHD flows, and perhaps to plasmas. On the other hand, the absence of "sweeping effects" in present conventional KS versions is identified as a major drawback in very different applications: inertial particle clustering (Vassilicos et al.) as well as in aeroacoustics. Nevertheless, this issue was addressed in some basic papers (Fung et al.), and merits to be revisited in the light of new studies in progress. The present workshop will investigate the link between KS and other classical Lagrangian models for the particular application of particles with inertia and in the presence of gravity.

A non-exhaustive list of related topics can be proposed as follows:

- improvement of the modelling of small scales advection by largest scales (sweeping),
- introduction of strongly anisotropic energy spectra with better randomization of the wave-vector,
- analogy with initialisation of DNS/LES and with "Particle Representation Models",
- use of specific modes consistent with geometric constraints, e.g. solid walls, instead of 3D spatial Fourier modes,
- improvement of KS as a subgrid model for LES : Lagrangian diffusion and aeroacoustics,
- competition between "wavy" (really spatio-temporal, propagating) and "vortical" structures of the velocity field for organizing Lagrangian turbulence diffusion, from fluid to plasma turbulence,
- other "synthetic" models, e.g. to afford intermittency, possibly very different from conventional KS.

Preliminary Programme:

K. Bajer, University of Warsaw, Institute of Geophysics, Poland
Turbulence in superfluid helium  

C. Cambon, Ecole Centrale de Lyon, France
Axisymmetric turbulence: towards a theory for both statistics and dynamics　

B. Favier, Ecole Centrale de Lyon, France
Synthetic models and DNS for MHD turbulence with external magnetic field and rotation　

K. Gumowski, Warsaw University of Technology, Poland
Wake behind a sphere - experimental research　

G. He, Beijing, Institute of Mechanics, Chinese Academy of Sciences, Beijing
Computation of space-time correlations by large-eddy simulation:
an application to aero-acoustics　

H. Kudela, Wroclaw University of Technology, Poland
Vortex particle method, the boundary conditions and eruption of boundary layer　

Y. Li, Sheffield Fluid Mechanics, Dept. of Appl. Maths, University of Sheffield, UK
Vorticity and geometrical statistics in isotropic helical turbulence　

A. Matulka, Universitat Politecnica de Catalunya, Dept Fisica Aplicada, Barcelona, Spain
Vorticity decay in stably stratified decaying turbulence　

C. Meneveau,  Department of Mechanical Engineering, Johns Hopkins University, Baltimore, USA
Minimal map synthetic turbulence: Intermittency and anomalous scaling　

T. Michelitsch, Université Pierre et Marie Curie, Institut Jean le Rond d'Alembert, Paris, France
Dispersion relations for self-similar quasi-continuous linear chains　

F. Nicolleau, Sheffield Fluid Mechanics, University of Sheffield, UK
Turbulence generated after a fractal orifice　

M. Priego Wood, Department of Aeronautics, Imperial College, London, UK
Synthetic turbulent-like flows realisable in the laboratory　

A. F. Nowakowski, Sheffield Fluid Mechanics, University of Sheffield, UK
Computing the evolution of interfaces using multi-component flow equations　

J.-M. Redondo, Universitat Politecnica de Catalunya, Dept Fisica Aplicada, Barcelona, Spain
Structure functions and intermittency in KS and DNS models of two-dimensional turbulence　

C. Rosales, Department of Mechanical Engineering, Univ. Tenica Federico Santa Maria, Valparaiso, Chile
Synthetic Turbulence via the Multiscale Lagrangian Map Approach　

S. M. Salim, Sheffield Fluid Mechanics, University of Sheffield, UK
Visualisation of fuel spray injected in turbulent flow　

J. Szumbarski, Warsaw University of Technology, Poland
Low-Reynolds-number instabilities of channel flows　

H. Zheng, F. Nicolleau & N. Qin*, Sheffield Fluid Mechanics, Mechanical Engineering*, University of Sheffield, UK
DES of fractal orifices

Final programme:

programme_warsaw_conference09.pdf