08 avril 2021

Webinar Cristian Marchioli

Cristian Marchioli is Associate Professor of Fluid Mechanics at the University of Udine and Editor of Acta Mechanica. In 2011-2015 he served as chairman of the COST Action on “Fiber suspension flow modeling” and, since 2018, as coordinator of the MSCA-ITN project "Next-Generation Computational Methods for Enhanced Multiphase Flow Processes”. Prof. Marchioli is also member of the scientific council of the International Center of Mechanical Sciences, where he coordinated several advanced schools on particle dynamics in turbulence. His research interests involve multiphase flow modelling, from small-scale particle-turbulence interactions to large-scale modelling of gas-solid/gas-liquid flows. He has edited the book “Collective dynamics of particles: From viscous to turbulent flows” (Springer), and has contributed to ERCOFTAC’s “Best practice guidelines for computational fluid dynamics of dispersed multiphase flows”. Prof. Marchioli has published 60+ papers and 150+ conference proceedings on multiphase flow modeling and simulation. He has also delivered several invited and keynote lectures (among others: 20th AIMETA Conf. in 2011, 13th Int. Conf. Multiphase Flows in Industrial Plants and Nordita Conf. on Dynamics of Particles in Flows in 2014, 3rd Int. Conf. Numerical Methods in Multiphase Flow in 2017, 3rd Int. Conf. on Turbulence & Interactions in 2018, IUTAM Symposium on Turbulent structure and particles-turbulence interactions in 2020).
Point-particle simulations of complex turbulent dispersed flows

Abstract: Particle transport and mixing in turbulent flows are fundamental to science as well as to technology. Examples of open scientific issues include emissions reduction in combustion, rheological characterization of fibrous particle suspension, plankton population dynamics, convection of pollutants in the atmosphere, to name a few. The simplest numerical framework to study the dynamical and statistical features of turbulent particle dispersion is based on the assumption that particles can be modeled as point-like spheres brought about by the flow. In spite of its simplicity, this framework has led to significant advancements in the study of particles-turbulence interactions, allowing the precise identification of the coherent structures responsible for particle sedimentation and re-entrainment in turbulent boundary layers. In this talk we examine two possible sources of bias in particle dispersion, which arise when particles are non-spherical (elongated) and may actively move within the fluid (motile). In particular, we show how particle motion, preferential concentration and accumulation in turbulent boundary layer can be modulated by elongation and by motility. Results relevant for particles suspended in environmental and wall-bounded turbulence are presented to give insights into important topics such as oceanic carbon cycling and industrial process optimization.

Abstract in PDF

08 avril 2021, 16h3017h30
Webinar (please contact F. Romano for the link)

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02 février 2023

Webinar Germain Rousseaux

A Descent Into The Maelstrom or Analogue Gravity (Black Holes, Wormholes and White Fountains) in Hydrodynamics

Germain Rousseaux is a Physicist with a strong interest in interdisciplinary studies. He is interested in physical analogies à la Clerk-Maxwell. His main research topics are physical hydrodynamics, relativities (special and general), classical electromagnetism, granular physics and nonlinear physics. He obtained his PhD at ESPCI Paris in 2003. After several post-doctoral positions at the University of Nice and ULB (Belgium), he joined the CNRS in 2007. Germain Rousseaux is currently CNRS Research Director at the Pprime Institute in Poitiers where he is co-leader of the Curiosity team.