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Non-Spherical Particles and Aggregates in Fluid Flows 2013


Non-Spherical Particles and Aggregates in Fluid Flows

June 17, 2013 — June 21, 2013


Cristian Marchioli (Università di Udine, Italy)

Federico Toschi (Eindhoven University of Technology, The Netherlands)

Dynamics of non-spherical particles and aggregates in fluid flow are encountered both in nature and in industrial applications. Examples for non-spherical particles include airborne solid particles or aerosols, carbon nanotubes, micro-organisms like phytoplankton, sediment-laden flows and wood-fibre suspensions. Particle aggregates are found in chemical, industrial or material processes for colloids and in polymer manufacturing. In these processes, particle size ranges from several nanometers to several centimeters, with loadings that may substantially change the macroscopic (rheological) properties of the suspension flow. On the other hand, transport and interaction of particles/aggregates in complex (e.g. turbulent) flows is governed by a number of physical processes occurring at a wide range of different scales. The rapidly increasing computational power has recently made feasible three-dimensional, time-dependent simulations of non-ideal particles in fluid flows, producing an entire branch of flourishing literature which is fostering research in dispersed multiphase flow. Progress has been substantial also from an experimental viewpoint, with improved measurement techniques based on optics or magnetic resonance flow imaging. Due to the multiscale nature of the problem, investigation and modelling require synergetic use of such approaches.

Objective of the course is to provide a general and unified frame of the current research on the dynamical behaviour of non-spherical particles and particle aggregates in complex flows and put future research paths in perspective. The focus will be on generic aspects and physics of non-ideal particle suspensions (e.g. rheological properties in suspensions of anisotropic deformable particles, and modulation of turbulence induced by particles/aggregates). Issues related to modelling and physical understanding at all various length scales will be covered: from the scale resolving the complex flow around individual non-spherical particles, to large eddy simulation models for flows with particles, to large-scale Eulerian-Eulerian models. Among the topics to be included are particle dynamics in free and wall-bounded turbulence, fluid-particle interactions, collision modelling, break-up and agglomeration, advances in measurement and simulation techniques, and rheological modelling.

The lectures will also provide a wide overview of cutting-edge work in this very active area of multiphase flow research and focus in more detail on a few advanced topics of significant practical and theoretical value in several areas of engineering and applied physics. This will reinforce understanding of the fundamental phenomena and their importance, providing participants with varied conceptual and methodological tools applicable to problems at hand. After the lectures, students should possess the necessary knowledge of the basic capabilities, potentials and limitations of the various numerical and experimental methods taught and, hence, should be able to critically evaluate the reliability and accuracy of the information these methods can provide when applied to practical situations.

The course delivers a comprehensive overview of non-ideal particle/aggregate dynamics in complex fluids, and hence will be particularly attractive to graduate students, PhD candidates, young researchers and faculty members in applied physics and (chemical, mechanical) engineering. The advanced topics and the presentation of current progress in this very active field will also be of considerable interest to many senior researchers, as well as industrial practitioners having a strong research interest in understanding the multi-scale complex behavior of such multiphase flows, with particular emphasis on turbulent flows.

Workshop session on Thursday will be led by Marco Vanni (Politecnico di Torino, Italy) and by Bernhard Mehlig (Goteborg University, Sweden) on “Numerical simulation of agglomeration and aggregate dynamics: modelling of particle collision and agglomeration in turbulent flows” and on “Tumbling of non-spherical particles in random flows”.

The course will be organized under the auspices of ERCOFTAC’s SIG12 “Dispersed Turbulent Two-Phase Flows” and SIG43 “Fiber suspension flow modelling” and with the support of two COST Actions: Action FP1005 “Fiber suspension flow modelling: a key for innovation and competitiveness in pulp & paper industry” and Action MP0806 “Particles in Turbulence”.


Non spherical particles, Aggregates of particles, Euler/Lagrange methods, DNS, LES, LBM.


Particles in turbulence 2013



Particles in turbulence 2013

1-5 July 2013, Eindhoven University of Technology, The Netherlands


The transport, distribution and collisions of particles in turbulent flows is of fundamental interest, as well as being present in a variety of engineering and naturally occurring flows. Examples of related scientific challenges include rain formation in clouds, pollution dispersion in the atmosphere, emission reduction in combustion and plankton population dynamics. In such flows, particle inertia is an important parameter, but in many cases finite particle size and deformation play important roles. In most real life flows, the flow geometries are complex due to mixed forcing at various scales. This in addition to the complex relationship between large scale structures, intermittency and anisotropy at the small scales of motion in turbulence present us with a rare challenge increase the scope of our understanding, by systematically investigate complex flows from the numerical, theoretical and the experimental point of view.

The purpose of the conference is to bring together experts from various fields of turbulence research, exchange ideas and discuss new methodologies for addressing these challenging issues.


FP1005 section This conference is organized in synergy with the FP1005 COST Action on "Fibre suspension flow modelling: a key for innovation and competitiveness in the pulp & paper industry". The FP1005 COST Action will organize an afternoon focusing on non-spherical and dense particles flow suspension. The session will be organized by Cristian Marchioli.


The attendance is subject to a fee of 250 euro that includes lunches and coffee breaks.

Organizing committee


Prof. dr. Federico Toschi (Eindhoven University of Technology, Eindhoven)

Prof. dr. Eberhard Bodenschatz (Max Planck Institute for Dynamics and Self-Organization, Goettingen)



School on Fluctuations and Turbulence in the Microphysics and Dynamics of Clouds


Training School Porquerolles (France)

2-10 September 2010

Short summay of the scientific objectives:

The formation and life of clouds is intrinsically linked to the dynamical properties of small particles transported in the atmosphere. These can be either the small aerosols on which water vapor condensates or the droplets that constitute the cloud. The role which is played by the turbulence of the airflow is still the matter of intense debates. The goal of the school is to gather experts in atmospheric sciences together with specialists of turbulent transport and of the Lagrangian statistical approach to fluid dynamics.

The courses will be divided in five themes:

A. State of the art in turbulent transport: models and theory

1. Lagrangian turbulence: correlations and violent events

2. Dynamics of heavy particles and dynamical systems

3. Condensation along Lagrangian paths in turbulent flows

4. Modelling collision rates between droplets


B. State of the art in turbulent transport: numerics and experiments

1. Direct numerical simulations of particles in turbulence

2. Numerical studies of collisions

3. Lagrangian experimental measurements in turbulence

4. Exchanges between numerics and experiments


C. Atmospheric turbulence, convection and clouds

1. Dynamics of the convective atmosphere

2. Thermodynamics of convection

3. Mixing and entrainment in turbulent clouds


D. Clouds microphysics

1. Introduction to the microphysics of clouds

2. Turbulence and rain formation in warm clouds

3. Ice crystals and stratified clouds

4. Numerical simulations of clouds


E. Applications to meteorology and climatology

1. In-situ measurements in warm clouds

2. Remote measurements of clouds and cloudy boundary layers

3. Parametrization of clouds in meteorological models

4. Interactions between aerosols, clouds and climate

5. Clouds and precipitations in global climatic models


The school will take place at the

Hotel-Club IGeSA, Rue de la Douane
Ile de Porquerolles
83400 Hyères
tel: +33 4 94 12 31 80

The island of Porquerolles is located in the South of France, in front of the city of Hyères Les Palmiers, and is a part of the national park of Port-Cros.
The nearest airport is Toulon/Hyères with direct flights from Paris, London, and Rotterdam.
Hyères is also reachable by train with frequent rail links from Paris or Nice, with changes in Toulon (see SNCF website).


Map of laboratories


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Training School on Data and dataformats c/o CINECA (Bologna, Italy). 


MP0806 COST Training School
Casalacchio di Reno (Bologna), Italy
Dates 15-16 March 2010

14 March 2010

In the afternoon/evening: arrival.

15 March 2010

08:30 - 08:45 Welcome addresses: Giovanni Erbacci (CINECA), Federico Toschi (MP0806 Chair)
08:45 - 09:45 Data-formats for fluid dynamics: the experimental view (Mathieu Gibert, Julian Martinez Mercado, Marc Wolf). 
09:45 - 10:00 Coffee Break
10:00 - 10:30 HDF5: introduction and applications (Claudio Gheller, Guillem Borrell i Nogueras and Federico Toschi)
10:30 - 11:00 The ICTR HDF5 data format for Lagrangian trajectories: where we are, where to go (Enrico Calzavarini)
11:00 - 12:00 Tutorials and exercises (Andrea Scagliarini, HDF5 - Enrico Calzavarini, PHP - Valentina Lavezzo)

12:00 - 14:00 Lunch & discussion time

14:00 - 15:30 Data modeling, metadata, databases and XML (Gerard Lemson)
15:30 - 16:30 Basics of PHP, mySQL and other tools (Giuseppe Fiameni)
16:30 - 18:30 Tutorials and exercises (Andrea Scagliarini, HDF5 - Enrico Calzavarini, PHP - Valentina Lavezzo)

19:30 - 20:30 Dinner & discussion time

16 March 2010

09:00 - 10:00 Federico Toschi: iCFDdatabase2. Present implementation and future developments
10:00 - 11:00 Other experiences: the Astronomical Virtual Observatory (Fabio Pasian)
11:00 - 13:00 Round table and discussion session

How to reach CINECA

Hotel:  we have reserved a bunch of rooms at the CALZAVECCHIO HOTEL (Via Calzavecchio, 1 - 40033 - Casalecchio di Reno  -  BOLOGNA - Italy), which is close both to CINECA and to the center of Bologna, at the special rate of 65 euros per night (breakfast included). If you want to reserve a room there, please send an e-mail to This e-mail address is being protected from spambots. You need JavaScript enabled to view it specifing your name and which nights you need (both, 14-15, or 15-16)


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