Complex Particles in Turbulent Flows

May 3-5., 2023


  Understanding particle dynamics in turbulence is relevant to mixing, combustion, and environmental pollution. The study of transport by turbulent flows has benefited greatly from the development of new experimental, numerical, and theoretical Lagrangian techniques. These have made it possible to investigate the statistics of the velocity, the acceleration, and the dispersion of both tracer and inertial particles. While the early Lagrangian studies were mainly concerned with the motion of point particles, in recent years the study of particle dynamics in turbulent flows has extended in several new directions. The Colloquium aims at discussing the recent advances and the open questions in the area of complex particle dynamics in turbulent flows by gathering scientists from both the physics and engineering communities.


Microscopic complex particles

While still moving with the fluid, such particles also possess additional degrees of freedom. Several studies have thus investigated the orientation and rotation of anisotropic solid particles (such as small rigid fibres or ice crystals), the stretching of elastic polymers, the bending of small flexible fibres, as well as their fragmentation. Complex-shape particles such as crosses, jacks, and helicoids have also been used to gain information on the local properties of the turbulent velocity field.

Particles with size in the inertial range

The study of objects with sizes in the inertial range, or even exceeding the velocity integral scale, is very challenging, as a finite-size object indeed samples multiple scales of the flow. If in addition the object is deformable, its conformation is strongly coupled with its displacement, further complicating its dynamics. The importance of such aspects is well known for filaments in quiescent and creeping flows. In turbulence, they have only recently begun to be studied in the case of long fibres.

Active particles in turbulent flows

The dynamics of active particles, such as swimming bacteria, spermatozoa, plankton, or anguilliform juvenile fishes, has also attracted much attention in recent years. The focus has been on how the orientation and deformation dynamics of such self-propelled particles interferes with the carrier turbulent flow. Another interesting question is how particle motility can possibly lead to the formation of 'active' aggregates and collective motions.

Practical information

Practical information

Please visit the official conference website:

Invited Speakers
  • Luca Brandt (KTH Stockholm, Sweden)
  • Massimo Cencini (CNR Rome, Italy)
  • Filippo Coletti (ETH Zurich, Switzerland)
  • Aurore Naso (ENS Lyon, France)
  • Agnese Seminara (University of Genoa, Italy)
  • Gautier Verhille (Aix-Marseille University, France)
  • Organizing committee:
    • Jérémie Bec (CNRS, Université Côte d'Azur, Nice, France)
    • Christophe Brouzet (CNRS, Université Côte d'Azur, Nice, France)
    • Rama Govindarajan (TIFR-ICTS, Bangalore, India)
    • Andrea Mazzino (University of Genoa, Italy)
    • Dario Vincenzi (CNRS, Université Côte d'Azur, Nice, France)
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