Sheffield Fluid Mechanic Group - Mechanical Engineering
Workshop of Synthetic Turbulence Models
29th-30th May, 2007
Co-organizer and Contact person: Dr. F. Nicolleau
Tel: +44 (0)114 222 7867
Department of Mechanical Engineering
Sheffield S1 3JD, United Kingdom
Co-organizer: Dr C. Cambon
Ecole Centrale de Lyon, France
It is second to be labelled ERCOFTAC/SIG 35 in 2007, -
a good opportunity to gather recognized specialists of "synthetic
two discussion sessions on the future of KS and their use for real time
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.
Tuesday 29th May 2007
12:00 - 13:00 Registration
13:00 - 13:30 S.
Kinematic Simulations as placebo and related issues.
13:30 - 14:10 J.
Kinematic Simulations for turbulent dispersion and clustering of inertial particles.
14:10 - 14:50 X.
LES, KS, and particle deposition in the human airways
14:50 -15:20 Break 30 min
15:20 - 16:00 B.
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.
Synthetic turbulence models for wind energy applications
09:00 - 09:40 M.
Developing KS Models of turbulence for replicating particle segregation, agglomeration and breakup
09:40 - 10:20 A.
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
DES development and interaction with KS
- 13:00 Lunch
13:00 - 13:40 B.
On geometrical alignments and Lagrangian simulations of turbulence
13:40 - 14:20 K.
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.
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)
A. I. Khan
The workshop will
be held in
G2 from the map
The workshop room will be in RD14, from the main entrance follow the signpost or the instruction from the map
Etruria House Hotel (Recommended)
Telephone: 0114 2662241
Single En Suite Room
Twin/Double En Suite Room
Prices include full English breakfast, service and VAT
Shude hill - SI 2AR -
Tel : (+44)114/2419600 Fax : (+44)114/2419610
Travelodge Sheffield Central Hotel
Tel: 0870 191 1805
Fax: 01142 723584
More accommodation recommendations, please review the website:
How to get here?
Regular services operate between Sheffield and London St. Pancras,
One of the easiest ways to travel to main campus is by the Supertram. The regular service stops at the railway station and the University. Tickets are purchased from the conductors on the trams.
There is a taxi rank at the railway station. The journey to the main campus takes about 15 minutes and 20-25 to the Halls of Residence.
Please see separated map for directions.