08 décembre 2022

Webinar Fabian Denner

Esteban Ferrer is a professor of applied mathematics at the School of Aeronautics (ETSIAE-UPM). He obtained his Ph.D. by the University of Oxford (UK) and has 20 years of industrial and academic experience in developing numerical techniques for fluid problems. He works actively with industry and coordinates the two EU projects. His main interests include high-order methods for fluid dynamics, turbulence modelling, machine learning, aeroacoustics for aeronautics and wind energy. He has written more than 90 journal and conference papers on these topics.
Acoustic emissions of cavitation bubbles and the (misleading) similarity to acoustic black hole analogues

Abstract: Bubble dynamics and cavitation play an important role in a broad variety of engineering applications, for instance as a root cause of material erosion, driving ultrasonic cleaning and antibacterial processes, and enabling novel diagnostic and therapeutic applications of medical ultrasound. Despite significant progress in understanding and foretelling pressure-driven bubble dynamics, there is still no comprehensive understanding of the potentially extreme conditions generated by collapsing bubbles, the acoustic waves and shock fronts emitted during the collapse, and how to attribute observations in measurements to specific effects or phenomena. During this seminar, I will be presenting recent advances in understanding the acoustic emissions of cavitation bubbles and, in particular, we will take a closer look at reduced-order models allowing us to gain a deeper insight of the pressure and velocity distribution resulting from these acoustic emissions. This then brings us to a perhaps esoteric but elegant model system, that has previously been proposed to be realised experimentally by cavitation bubbles: acoustic black hole analogues. I will explain how an acoustic black hole analogue can be utilised to learn more about nonlinear Doppler modulations of acoustic waves in an accelerating flow field, as they occur, for instance, around cavitation bubbles, but I will also discuss why a bubble can likely not serve as an acoustic black hole in reality

08 décembre 2022, 16h3017h30
Wébinaire (veuillez contacter J-P Laval ou F Romano pour obtenir le lien)

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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.