Workshop of Synthetic Turbulence Models

29th-30th November, 2007









Co-organizer (local): Prof. J. M. Redondo




Fisica Aplicada UPC,

Campus Nord B5. Barcelona 08034, Spain

Fax(+34) 93401 6090.


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

- This workshop follows the one help in May at Sheffield (UK)


Workshop of Synthetic Turbulence Models

29th-30th May, 2007


- It was then recognised that the KS community needs to meet regularly


- We take the opportunity of another ERCOFTAC event (SIG14), in Barcelona to organise there our second workshop on Synthetic Turbulence Models



Workshop Program: Preliminary under construction


Confirmed talks:



Dr A. Baggaley, University of Newcastle, UK 


The Flux Tube Dynamo


Dr K. Bajer, University of Warsaw, Poland 


Magnetoelliptic instability in a rotating frame


Dr C. Cambon, Ecole Centrale de Lyon, France


KS incorporating linear dynamics and strongly anisotropic spectra.


Dr R. Castilla, UPC, Terrasa, Spain


Eulerian and Lagrangian comparisons of 2D DNS and KS


Dr A. Khan, University of Glasgow, UK


LES, KS, and particle deposition in the human airways


Dr F. Nicolleau and A. Abou El Azm. University of Sheffield, UK


KS prediction for the dispersion of tetrahedon


Prof. M. Reeks, University of Newcastle, UK


Application of KS to particle Segregation in Turbulent Structures


J.M. Redondo, UPC, Barcelona, Spain


Hyperdiffusivity in non-homogeneous turbulence


M. Wächter,  Carl von Ossietzky University, Oldenburg, Germany


Stochastic multiscale analysis and reconstruction of time series of small scale turbulence




To be confirmed talks:



Pr J Davila, University of Seville, Spain







This workshop will be the third to be labelled ERCOFTAC/SIG 35 in 2007.

The second dedicated to Synthetic Turbulence Models. 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. Abou ElAzm                                       University of Sheffield (UK)

A. Baggaley                                            University of Newcastle, School of Mathematics and Statistics (UK)

K. Bajer,                                                 University of Warsaw, Poland 

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

R. Castilla,                                              UPC, Terrasa, (Spain)

M. I. A. Khan                                         Univeristy of Glasgow (UK)

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

J. M. Redondo                                        UPC, Barcelona (Spain)

M. Reeks                                                University of Newcastle (UK)

M. Wächter                                            Carl von Ossietzky University, Oldenburg, Germany




Preliminary programme




12:00-12:30              Registration, XDFTG and ERCOFTAC SIGs outlook and Welcome adress. Jose M. Redondo, P. Fraunie, F. Nicolleau , Nuria Blanes and P.Arnau


12:30-13:00              Diffusion and Lagrangian Methods in Stratified flows. J.M.Redondo


13:00 - 14:30. Lunch


15:00-15:40              Numerical Models of Coastal flows. P. Fraunie


15:40-16:20              Turbulence parametrizations in complex Flows. T. Bodnar


16:20-17:00              ERCOFTAC New SIG on Synthetic Turbulence. F. Nicolleau


17:00-17:30. Coffee Break


17:30-18:20              Turbulent dispersion and diffusion. A. Maurizi


18:20h-18:40.           Experiments in Rotating Stratified Forced Flows. A.Matulka and A.Carrillo


18:40-19:20.             TBA- Kinematic Simulations. A. Baggaley/Matias, Waechter/Elena Menguz


19:30-22:30              Short Poster (1 and 2 session) Presentations


20:30-22:00             Reception at the Moli de mar Gardens





09:00-15:30              SYNTHETIC TURBULENCE ERCOFTAC SIG. Special Session


09:00-09:30              KS prediction for the dispersion of tetrahedon. F.Nicolleau and A. Abou El Azm.


09:30-10:00              LES, KS, and particle deposition in the human airways. A.Khan


10:00-10:30.             Application of KS to particle Segregation in Turbulent Structures. M. Reeks


10:30-11:00              TBA- Synthetic Turbulence models. A. Abou ElAzm/ Matias Waechter/Elena Meneguz


11:00h-11:30h. Coffee Break


11:30-12:00              Vortice structure in Turbulence models. K. Bajer


12:00-13:00              Lagrangian Turbulent Diffusion and Generalized Richardson¡¯s Law. Roberto Castilla/ Armando Babiano


13:00-13:30              . Fractal analysis in turbulent environments. Joan Grau


13:30-14:30. Lunch


15:00-15:30              Stratified and rotating turbulence models. C.Cambon


15:30-16:00              Hyperdiffusivity in non-homogeneous turbulence. J.M. Redondo


16:00-16:30              Numerical models of Stratified Rotating turbulence. A.Delache, Godofred and C. Cambon


16:30 - 17:00            Oil Spills, Slicks and Vortices in the NW Mediterranean Sea. Alexei Platonov


17:00-18:00              . Cofee Break and Poster session 1


18:00-18:20.             Intermittency and the Atmospheric Boundary Layer Turbulence. C. Vindel, J.M. Redondo and C. Yague.


18:20-18:40 .            Deep Ocean sensors. X. Roset


18:40-19:00.             Rotating-Stratified flow- PIV experimental measurements. A. Carrillo


19:00-19:20.             Ocean Instrumentation advances. O.Lopez


19:20-19:40.             Vortices in the Ocean Surface. P. Arnau


19:40-20:20              Discussion about ERCOFTAC SIG activities


20:30-23:00              Barbaque Dinner at the Moli de Mar Site.



Practical information


The conference will take place at the same place as




                                                 NON-HOMOGENEOUS TURBULENCE


29th November- 1st December 2007

CUM-UPC, Vilanova i la Geltr¨²

Barcelona, Spain




The local contact person is



Secretaria del CUM


C/ de la Uni¨® , 81-87

08800 Vilanova i la Geltr¨²


Tel.: +34 93 893 83 99

        +34 93 814 04 40

Fax: +34 93 893 83 99








                       MOLI DE MAR, Po Ermita de St. Cristofor  (Far)

                      Vilanova i la Geltr¨², 08800 Barcelona, Spain





To Tarragona


To Barcelona





How to arrive to Vilanova



*From the Airport:  Take the RENFE railway towards Barcelona SANTS, at EL PRAT change trains and take the southward train  Line C2 towards Vilanova


*From Highway A7: Exit at Vilafranca del Penedes towards Vilanova i la Geltru- Sitges


*From Highway C-32 ( or C-31)  Exit at the first Vilanova I la Geltru Exit, follow the 1st roundabout towards the Beach ( to go to Moli de Mar ) or to the RENFE station (to go to the UPC Residence and to Can Gatell Hotel.





Accommodation and Information




The lectures and accommodation will take place at the MOLI DE MAR

Large House near the Lighthouse


There are also additional optional rooms available  for participants at:


Hotel CAN GATELL    CAN GATELL INN **. 6-16, Puigcerd¨¢ street. Phone (+34) 938 930 117 


Residencia UPC: Rambla de l'Exposici¨® 41  Tel: 93 811 59 00