ERCOFTAC/SIG 42

 

4th Workshop on Synthetic Turbulence Models

 11th-12th December 2008, Nancy

 

 Synthetic turbulence model and particle-laden flows

 

Nancy-Universit

 

 

 

Co-organizer (local): Dr J.-R. Angilella

Jean-Regis.Angilella@ensem.inpl-nancy.fr
Nancy-Universit└
LAEGO (Laboratoire Environnement, G└om└canique et Ouvrages)
rue du doyen Roubault, B.P 40,
54501 Vandoeuvre-les-Nancy Cedex, France

 

Co-organizer: Dr F. Nicolleau

F.Nicolleau@sheffield.ac.uk

+44 (0)114 222 7867

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

 

   

              

Aims of the workshop

 

- This workshop is the 4th  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 to appear

 

Workshop Program:

 

Preliminary talks:

 

 

A. Baggaley, University of Newcastle, Mathematics & Statistics, UK

 

TBA

 

J.-R. Angilella, Nancy-Universit└s, LAEGO, France

 

Asymptotic analysis of chaotic particle settling in an unsteady rotating flow : the stretch, sediment and fold mechanism
     

S. Coleman and J. C. Vassilicos, Imperial College, London

 

TBA

 

B. Favier, ECL, Lyon, France

 

A linear model for magnetohydrodynamics using KS

 

A. Matulka*, A. Babiano and J.M Redondo*, Ecole Normale Superieure, Paris, France, *Dept. Fisica Aplicada, UPC, Barcelona, Spain

 

Comparison between Eulerian and Lagrangian descriptors in Direct Numerical Simulations and Synthetic Turbulence

 

E. Meneguz, University of Newcastle, School of Mechanical & Systems Engineering, UK

 

TBA

 

T. Michelitsch, F. Nicolleau* and A. Nowakowski*,  Universit└ Pierre et Marie Curie (Paris 6), Institut Jean le Rond d'Alembert, *University of Sheffield, UK

 

KS input spectrum, some fundamental works on the vibration spectrum of a self-similar linear chain

B. Oesterl└, LEMTA, Nancy-Universit└


Using kinematic simulation to investigate the behaviour of dense or light particles  in homogeneous turbulence

 

D. Queiros-Conde & M. Feidt

 

Scale-entropy diffusion equation for turbulent combustion

 

J.M. Redondo, R. Castilla* and A. Carrillo,  Universitat Politecnica de Catalunya, Dept Fisica Aplicada (* Mec. Fluidos), Barcelona (*Terrasa), Spain

 

Dependance of Turbulent eddy diffusivities on spectral behavious: The Generalized Richardson's Law in Stratified Rotating flows


H. Zheng & A. F. Nowakowski, University of Sheffield, Mechanical Engineering, UK

 

Solution adaptive simulation of multifluid flows with general equation of state

 

 

 

Audience:
This workshop will be the fourth on Synthetic turbulence organised by ERCOFTAC/SIG 42

It is open to anyone interested in "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):

 

J.-R. Angilella                                         Nancy-Universit└s, LAEGO, France

A. Baggaley                                            University of Newcastle, Mathematics & Statistics, UK

S. Coleman                                            Imperial College, London, Aeronautics, UK

B. Favier                                                Ecole Centrale de Lyon, LMFA, France

M. Feidt                                                 Nancy-Universit└s, LAEGO, France

F. S. Godeferd                                        Ecole Centrale de Lyon, LMFA, France

Y. Li                                                      University of Sheffield, Applied Mathematics, UK

E. Meneguz                                            University of Newcastle, School of Mechanical & Systems Engineering, UK

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

T. Michelitsch                                        Universit└ Pierre et Marie Curie  (Paris 6), Institut Jean le Rond d'Alembert

F.C.G.A. Nicolleau                                  University of Sheffield, Mechanical Engineering, UK

A. F. Nowakowski                                  University of Sheffield, Mechanical Engineering, UK

K. Ohkitani                                            University of Sheffield, Applied Mathematics, UK

B. Oesterl└                                             LEMTA, Nancy-Universit└

D. Queiros-Conde                                   ENSTA (Paris), Chimie et Proc└d└s, France

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

H. Zheng                                                University of Sheffield, Mechanical Engineering, UK

 

 

Preliminary programme:

length of talks: 25 min + 5 min for questions

 

 

 

Practical information:

 

Ecole de G└ologie
rue du doyen Roubault, B.P 40,
54501 Vandoeuvre-les-Nancy Cedex

 

 

Travel and accommodations information

 

Tram ligne 1 information