1. Particles in turbulence MP0806
Start date: 19/05/2009
End date: 18/05/2013
Year: 1
Federico Toschi
Chair
Technische Universiteit Eindhoven / The Netherlands

2. Particles in turbulence
Plankton
Dust stoms
Pollution
Combustion

3. Eulerian turbulence
Energy flux
Inertial range

4. Turbulence: yesterday & today
MPI (Goettingen, Germany)
Year 1500
Year 2004
River Arno
(Toscana, Italy)
IBM SP4 (CINECA, Italy)

5. Turbulence Infrastructures vs. COST vs. Science in Europe
Interaction with Applications
Environmental Science, Atmospheric Science, Oceanography and Meteorology. Engineering sciences including Mechanical, Electrical, Chemical, Aereospace, Transport. Comunities of researchers working in Geophysics, Astrophysics, Condensed Matter Physics, Plasma Physics / Fusion…
Database of knowledge
Standardized raw data repository
Europe
Rest of the world
COST
Particles in turbulence
EU-HIT
European High-Performance
Infrastructures in Turbulence
iCFDdatabase
International CFD
database
ICTR
International Collaboration
for Turbulence Research

6. Scientific topics / program
A preliminary list of scientific topics to be addressed in the near future
transport of non ideal particles
e.g. finite size, finite inertia, non spherical shapes
collisions amongst particles
coalescence of droplets in turbulence
breakup of colloids and droplets in turbulence
particles transport in presence of gravity
particles transport in presence of shear
development and validation of experimental techniques
development and validation of computational techniques
development of models

7. Universality of Lagrangian Turbulence
A. Arneodo, R. Benzi, J. Berg, L. Biferale, E. Bodenschatz, A. Busse, E. Calzavarini, B. Castaing, M. Cencini, L. Chevillard, R. T. Fisher, R. Grauer, H. Homann, D. Lamb, A. S. Lanotte, E. Leveque, B. Luthi, J. Mann, N. Mordant, W. C. Muller, S. Ott, N. T. Ouellette, J. F. Pinton, S. B. Pope, S. G. Roux, F. Toschi, H. Xu, and P. K. Yeung. Universal intermittent properties of particle trajectories in highly turbulent flows. Physical Review Letters, 100(25):254504–5, 2008.

8. Action Parties
Grant Holder:
GH TU/e
GH Netherlands
19=16+3

9. Use of COST instruments
YR 1
YR 2
YR 3
YR 4
No. of MC / WG meetings
2 MC / 1 WG
3 WG planned
No. of STSMs -
No. of workshops / conferences
1 SC
No. of joint publications
No. of training schools
1 (planned)
GASG (activities)
Posters, website

10. Scientific context and objectives (1/2)
Background / Problem statement:
Transport of particles in turbulent fluids - The dynamics of particles in a turbulent flow is fundamental to everyday life - examples of open scientific and technological issues include rain formation in clouds, pollution dispersion in the atmosphere, optimization and emission reduction in combustion, plankton population dynamics - and constitute a major scientific challenge with immediate practical implications and applications. Open scientific issues such as inertia, finite particles sizes, collisions, advection in complex flow geometries are examples of fundamental key ingredients which pose challenging theoretical problems and need to be understood in order to have an impact on applications.
Brief reminder of MoU objectives
1 - Support research in the broad area of particle transport in turbulence
2 - Definition of test cases (TC) and best practices (BP)
3 - Know-how dissemination
4 - Interaction with other communities

11. Scientific context and objectives (2/2)
Research directions:
Research conducted by individual laboratories coordinated by means of the COST Action and organized in 4 WGs.
Know-how dissemination through web site and raw data sharinghttp://mp0806.cineca.it
Cross-validation of experimental and computational techniques towards the definition of Best Practices (BP) and Test Cases (TC) will allow the development of refined tools.

12. Working groups WG 1: Experiments WG 2: Numerical simulations
Beat Luethi, Detlef Lohse
WG 2: Numerical simulations
Luca Biferale, Alain Pumir
WG 3: Models
Jeremie Bec, Gregory Falkovich
WG 4: Applications
Holger Siebert, Joerg Schumarcher, Mike Reeks

13. Results vs. Objectives
Planned first WG meetings, setup of web infrastructure for community building, document and data exchange.
Each groups / single researcher has access to one (maybe two?) particular computer code or experimental equipment.
It is hence not possible to fully validate the reliability of tools.
The COST action will allow cross validation of tools, on top of scientific collaboration and exchanges.

14. Challenges
Coordination of STSM and WG activities to the achievement of the project goal
One of the major challenges will be the effective coordination of activities and a proper collection of information because:
action MP0806 is very large (already 19 countries)
has several objectives
different research groups with different expertise and goals

15. Thanks you.
Polystyrene spheres 25 μm in diameter are used as tracers in experiments and illuminated by a green YAG laser with a mean output power as high as 35W. Photo courtesy of E. Bodenschatz.
Federico Toschi