ERCOFTAC/SIG 42-SIG 35

 

5th Workshop on Synthetic Turbulence Models

 1st-3rd July 2009, Warsaw

 Synthetic models and vortex methods

 

Politechnika Warszawska - Uniwersytet Warszawski

Warsaw University of Technology - University of Warsaw

Warsaw, Poland

 

 

 

Co-organizer (local): Dr A. Nowakowski

University of Sheffield, Sheffield Fluid Mechanics, Department of Mechanical Engineering
Mappin Street
Sheffield S1 3JD, United Kingdom

 

Co-organizer (local): Dr K. Bajer

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 Engineering
Mappin Street
Sheffield S1 3JD, United Kingdom

 

   

              

Aims of the workshop

 

- This workshop is the 5th  workshop held by the ERCFOFTAC

  Special Interest Group on Synthetic Turbulence Models. It follows those held 

            29th-30th May, 2007                    The University of Sheffield

ERCOFTAC bulletin 75, 2007

            29th-30th November, 2007           UPC, Vilanova i la Geltru
ERCOFTAC bulletin 77, 2008

            3th-4th July 2008                        The University of Newcastle, UK
ERCOFTAC bulletin 79, 2009

               11th-12th December 2008            Nancy
ERCOFTAC bulletin 79, 2009

 

Workshop Program:

 

Preliminary talks:

 

 

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, Universit└ 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

 

 

 

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.

 


participants (preliminary):

 

K. Bajer,                                               University of Warsaw, Institute of Geophysics, Poland 

C. Cambon,                                           Ecole Centrale de Lyon, France

B. Favier,                                               Ecole Centrale de Lyon, France

K. Gumowski                                        Warsaw University of Technology, Poland

G. He,                                                   Institute of Mechanics, Chinese Academy of Sciences, Beijing

A. Kosior                                              Wroclaw University of Technology, Poland

H. Kudela                                              Wroclaw University of Technology, Poland

Y. Li,                                                    Sheffield Fluid Mechanics, Dept. of Appl. Maths, University of Sheffield, UK

A. Matulka,                                            Universitat Politecnica de Catalunya, Dept Fisica Aplicada, Barcelona, Spain

C. Meneveau,                                         Department of Mechanical Engineering, Johns Hopkins University, Baltimore, USA

T. Michelitsch,                                       Universit└ 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

P. Regucki                                            Wroclaw University of Technology, Poland

M. Priego Wood,                                    Department of Aeronautics, Imperial College, London, UK

J.-M. Redondo,                                     Universitat Politecnica de Catalunya, Dept Fisica Aplicada, Barcelona, Spain

J. Rokicki                                              Politechnika Warszawska, Poland

C. Rosales,                                           Department of Mechanical Engineering, Univ. Tenica Federico Santa Maria, Valparaiso, Chile

S. M. Salim,                                          University of Sheffield, Sheffield Fluid Mechanics Group, UK

J. Szumbarski                                       Warsaw University of Technology, Poland

H. Zheng                                               University of Sheffield, Sheffield Fluid Mechanics Group, UK

 

 

 

Preliminary programme:

length of talks: 20 min + 5 min for questions

 

 

Practical information:

 

 

Dr A. Nowakowski

 

The conference will be held at

Warsaw University of Technology
Faculty of Power and Aeronautical Engineering
Institute of Heat Engineering (ITC building)
25 Nowowiejska Street
Conference room: 105