Mar 20 – 31, 2023
Albano Building 3
Europe/Stockholm timezone


How particles or droplets can grow in a turbulent environment is of great current interest in many fields, in astrophysics, cloud microphysics, in biology, and in the engineering sciences.

For example, coagulation and condensation in turbulent clouds turn microscopic cloud droplets into rain drops. In astrophysics, planetesimals are thought to form by aggregation of microscopic dust grains in the turbulent environment surrounding a forming star. In both cases, turbulence is believed to be a crucial factor for particle growth. Yet the microscopic mechanisms determining this growth are far from understood. In the past few years there has been substantial progress in understanding the mechanisms that determine how particles move in turbulence, through experiments, numerical simulations, and the analysis of statistical models.

The challenge is now to understand how and under which circumstances these mechanisms may lead to or prevent particle growth in turbulence.

The program is aimed at scientists interested in the dynamics and the growth particles in turbulence, applications in the atmospheric sciences, astrophysics & engineering, or the mathematical analysis of these phenomena.


Themes and preliminary program schedule

We intend to organize the program around the following them

  • Condensation and coagulation in clouds
  • Collisions and aggregation in turbulence
  • Non-spherical particles in turbulence


Condensation and coagulation in clouds. Condensation and coagulation in clouds. Suggested topics include models for evolution of cloud-droplet-size distributions and how it is affected by turbulent fluctuations on different scales. Studies of entrainment and other effects of  inhomogeneities of the system and condensation and coagulation of atmospheric aerosol particles affected by turbulent fluctuations are also welcome.

Collisions and aggregation of particles in turbulence. Suggested topics are models for particle aggregation, fragmentation, and erosion that take into account turbulent fluctuations, and their applications in astrophysics. We also intend to discuss recent progress and open questions in the mathematical analysis of statistical models for the dynamics and for aggregation of particles in turbulence. Regarding particle collisions, key topics are the effect of hydrodynamic interactions, as well as models for and measurements of collision and coalescence efficiencies.

Non-spherical particles. Suggested topics are the dynamics of ice crystals in turbulent clouds, and also the dynamics of plankton in the turbulent ocean, their feeding rates for example, and more generally the survival strategies of small organisms and smart particles in turbulence.


We encourage participants to apply for the whole two-week period. The aim of this program is to initiate interdisciplinary collaborations. The above topics are just suggestions. We will only have short talks (15+5 mins) during the program, to leave free time for discussions and collaborations during the afternoons. There will be plenty of time for discussions in a relaxed atmosphere.



Registration to be considered for on-site participation will close December 15 (2022). Registrants will receive an on-site/remote participation confirmation from the organizers after this date.

Sponsored by:

Albano Building 3
Hannes Alfvéns väg 12, 10691 Stockholm, Sweden
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