The University of Sheffield

Sheffield Fluid Mechanic Group - Mechanical Engineering







Workshop of Synthetic Turbulence Models

29th-30th May, 2007



Mappin Building, University of Sheffield



Co-organizer and Contact person: Dr. F. Nicolleau


Tel:        +44 (0)114 222 7867

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


Co-organizer: Dr C. Cambon


               Ecole Centrale de Lyon, France

Aims of the workshop

- It is second to be labelled ERCOFTAC/SIG 35 in 2007,

- a good opportunity to gather recognized specialists of "synthetic turbulence",

- two discussion sessions on the future of KS and their use for real time simulation techniques.
































Workshop Program:

Tuesday 29th May 2007


12:00 - 13:00         Registration


13:00 - 13:30          S. Chernyshenko                    University of Southampton

                                                                            Kinematic Simulations as placebo and related issues.


13:30 - 14:10          J. C. Vassilicos                       Imperial College, Aeronautics

                                                                            Kinematic Simulations for turbulent dispersion and clustering of inertial particles.


14:10 - 14:50          X. Y. Luo                               University of Glasgow, Department of Mathematics

                                                                            LES, KS, and particle deposition in the human airways


14:50 -15:20         Break 30 min


15:20 - 16:00          B. Ganapathisubramani           Imperial College, Aeronautics

                                                                            Large scale coherence in wall-bounded flows


16:00 - 16:30          C. Cambon                            Ecole Centrale de Lyon, LMFA, (France)

                                                                            From turbulent (Lagrangian) diffusion to aeroacoustics: instances of KS incorporating linear dynamics


16:30 - 17:00          B. Favier                                Ecole Centrale de Lyon, LMFA, (France)

                                                                            Preliminary results in aeroacoustics, from KS to future LES


17:00 - 17:30          D. Kleinhans                          University of Oldenburgh, (Germany)

                                                                            Synthetic turbulence models for wind energy applications                          


Mercredi 30th May 2007

09:00 - 09:40          M. Reeks                               University of Newcastle

                                                                            Developing KS Models of turbulence for replicating particle segregation, agglomeration and breakup


09:40 - 10:20          A. Baggaley                           University of Newcastle, School of Mathematics and Statistics,

                                                                            KS model: Applications to the fluctuation dynamo


10:20 - 11:00          S. Di Sabatino                        Universita' di Lecce, (Italy)

                                                                            Airflow and dispersion in the urban atmosphere


11:00 - 11:30          N. Qin - F. Nicolleau              University of Sheffield, Mechanical Engineering

                                                                            DES development and interaction with KS

11:30 - 13:00        Lunch Break   1h30

13:00 - 13:40          B. Protas                                McMaster University, Department of Mathematics and Statistics (Canada)

                                                                            On geometrical alignments and Lagrangian simulations of turbulence


13:40 - 14:20          K. Ohkitani                            University of Sheffield, Applied Mathematics

                                                                             Survey and numerical simulation of Lagrangian stability of ideal fluid motion


14:20 - 15:00          Discussion 1:

The opportunity to launch a new SIG within ERCOFTAC could be investigated during this meeting. Even if the topic of ˇ°KS, Synthetic turbulenceˇ± already exists in the present SIG 35, a critical mass of researchers exists for a possible new, more specific, SIG.


15:00 - 15:30         Break 30 min


15:30 - 16:30          Discussion 2:

The opportunity to make a proposal to the EU for developing real time KS techniques will be investigated. There are many environmental situations where limited real time data is available (e.g. from anemometers /wind direction vanes; lidar etc)-and this will expand in future. Such a proposal would ideally fit with the EU ICT programme for using new concepts and technology for disasters and other environmental problems.

This workshop will be the second to be labelled ERCOFTAC/SIG 35 in 2007. If you are not member of the SIG (Special Interest Group) 35, this message may concern you as a specialist of "synthetic turbulence" including the so-called Kinematic Simulation, KS hereinafter.


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.


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" (Kassinos et al.),
- 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 (Luo et al.)
- 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.


After posing these problems and others,

the workshop will end with two discussion groups about the future of KS and Synthetic Turbulence.

Confirmed participants:


A. Baggaley                                            University of Newcastle, School of Mathematics and Statistics,

C. Cambon                                             Ecole Centrale de Lyon, LMFA, (France)

S. Chernyshenko                                     University of Southampton

S. Di Sabatino                                         Universita' di Lecce, (Italy)

B. Favier                                                Ecole Centrale de Lyon, LMFA, (France)

B. Ganapathisubramani                             Imperial College, Department of Aeronautics

M. A. I. Khan                                          University of Glasgow, Department of Mathematics

D. Kleinhans                                           University of Oldenburgh (Germany)

X. Y. Luo                                                University of Glasgow, Department of Mathematics

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

K. Ohkitani                                             University of Sheffield, Department of Applied Mathematics

Bartosz Protas                                         McMaster University, (Canada)

N. Qin                                                    University of Sheffield, Department of Mechanical Engineering

M. Reeks                                                University of Newcastle

J. C. Vassilicos                                        Imperial College, Department of Aeronautics




Practical information


The workshop will be held in Mappin Building, the main access of the building is from Mappin street:

G2 from the map

University of Sheffield map


The workshop room will be in RD14, from the main entrance follow the signpost or the instruction from the map

Direction to RD14 map



Sheffield Accommodation Recommendation:

Etruria House Hotel (Recommended)

91 Crookes Road, Broom Hill, Sheffield, South Yorkshire, S10 5BD
Telephone: 0114 2662241

Etruria House Hotel, Sheffield, Bedroom, 7KEtruria House Hotel, Sheffield, Dining Room, 10K


Daily Rate

Single Room


Single En Suite Room


Twin/Double Room


Twin/Double En Suite Room


Triple/Family Room


Prices include full English breakfast, service and VAT


Other hotels:

Ibis Sheffield:

Tel : (+44)114/2419600 Fax : (+44)114/2419610

Travel Lodge Sheffield Central:

Travelodge Sheffield Central Hotel
1 Broad Street West
Sheffield S1 2BG

Tel: 0870 191 1805
Fax: 01142 723584


More accommodation recommendations, please review the website:


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