10 décembre 2020

Wébinaire Metin Muradoglu

Dr. Muradoglu is a professor of Mechanical Engineering at Koc University. He received his BS degree in Aeronautical Engineering from Istanbul Technical University (ITU) in 1992, and MS and PhD degrees both from Cornell University in 1997 and 2000, respectively. He also worked as a postdoc at Cornell for about 18 months before joining the Koc University faculty in 2001. He has had visiting positions at Harvard, Notre Dame and Princeton Universities, and the Max-Planck Institute for Intelligent Systems in Stuttgart. Dr. Muradoglu’s work has been recognized by multiple awards including the Turkish Academy of Sciences outstanding young scientist award (2009) and the Scientific and Technological Research Council of Turkey (TUBITAK) encouragement award (2010). He has been an associate member of Turkish Academy of Sciences since 2012.
Effects of viscoelasticity and surfactant on turbulent bubbly channel flows

Abstract: Interface-resolved direct numerical simulations are performed to examine the sole and combined effects of soluble surfactant and viscoelasticity on the structure of mon- and poly-dispersed bubbly turbulent channel flows for the friction Reynolds number in the rage between Reτ=127.3 and Reτ=250. A soluble surfactant and FENE-P viscoelastic models are coupled to the incompressible flow equations. In the clean case, small bubbles move toward the wall due to the inertial lift force, resulting in the formation of wall-layers and a significant reduction in the flow rate while larger bubbles tend to move toward channel center. An addition of strong enough surfactant alters the direction of lateral migration, i.e., the contaminated bubbles move toward the core region and spread out across the channel. For the viscoelastic case, shear-thinning effects and elastic forces promote formation of bubbly wall-layers leading to a strong decrease in the flow rate. Formation of a wall-layer is determined by the interplay of the inertial lift, elastic and Marangoni forces when they coexist.

10 décembre 2020, 16h3017h30
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01 décembre 2022

Wébinaire Esteban Ferrer

New avenues in high order fluid dynamics

Esteban Ferrer est professeur de mathématiques appliquées à l'école d'aéronautique (ETSIAE-UPM). Il a obtenu son doctorat à l'université d'Oxford (Royaume-Uni) et possède 20 ans d'expérience industrielle et universitaire dans le développement de techniques numériques pour les problèmes de fluides. Il travaille activement avec l'industrie et coordonne deux projets Européens. Ses principaux intérêts sont les méthodes d'ordre élevé pour la dynamique des fluides, la modélisation de la turbulence, l'apprentissage automatique, l'aéroacoustique pour l'aéronautique et l'énergie éolienne. Il a rédigé plus de 90 articles de journaux et de conférences sur ces sujets.