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.

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08 April 2021, 16h3017h30

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14 November 2024

Webinar Elizabeth GUAZELLI

Bodies of revolution in shear flows at low inertia

Elisabeth Guazzelli's research interests are in the field of particulate multiphase flows, such as fluidized beds, suspensions, sedimentation and sediment transport. She has spent her entire career as a CNRS researcher, leading an active and diversified research group at the IUSTI laboratory of the University of Aix-Marseille, and has now moved to the MSC (Matière et Systèmes Complexes) laboratory of the University Paris Cité. She is Rector of the International Center for Mechanical Sciences in Udine (Italy). She has been Associate Editor of the Journal of Fluid Mechanics since 2005 and is currently JFM Rapids Editor. Fellow of the American Physical Society and of the European Mechanics Society (EUROMECH), she is the recipient of the EUROMECH Fluid Mechanics Prize in 2016 and the APS Fluid Dynamics Prize in 2023. She was elected an international member of the Istituto Veneto di Scienze, Lettere ed Arti in 2020 and of the US National Academy of Engineering in 2021.