Скачать с ютуб ADI | Samriddhi Sankar Ray | How different are the worlds of high and low Reynolds number turbulence в хорошем качестве

ADI | Samriddhi Sankar Ray | How different are the worlds of high and low Reynolds number turbulence

ADI | Prof. Samriddhi Sankar Ray | How different are the worlds of high (inertial) and low (active) Reynolds number turbulence? Scaling, Universality, and Spottiness Speaker: Professor Samriddhi Sankar Ray (International Centre for Theoretical Sciences, TIFR, Bangalore) Date: 8th Feb 2024 Title: How different are the worlds of high (inertial) and low (active) Reynolds number turbulence? Scaling, Universality, and Spottiness Event: (ADI) Anti-diffusive dynamics: from sub-cellular to astrophysical scales Abstract: Active turbulence — the spatio-temporally complex motion of a dense suspension of microorganisms such as bacteria — has gathered great traction recently as an intriguing class of emergent, complex flows, occurring in several living systems at the mesoscale, whose understanding lies at the interface of non-equilibrium physics and biology. However, are these low Reynolds number living flows really turbulent or just chaotic with structural, or even superficial, similarities with high Reynolds number (classical) inanimate turbulence? In this talk we address these questions with a focus on the issues of (approximate) scale-invariance, intermittency and maximally chaotic states and how they lead to anomalous diffusion in bacterial suspensions. In particular, we show the existence of a critical level of activity beyond which the physics of bacterial flows become universal, accompanied by maximally chaotic states which allow for efficient, Levy-walk mediated foraging strategies. We then, if time permits, turn to the question of high Reynolds number, inertial turbulence and show that it is possible to construct local measures of multifractality. These measures suggest that fully developed turbulence is far from uniformly multifractal which suggests new ways to revisit the old problem of how flows may turn singular. 👉 Want to learn more about the talks in this stream? Seminar Link:https://www.newton.ac.uk/seminar/41794/ Programme: https://www.newton.ac.uk/event/emg/ ------------------- FOLLOW US 🌐| Website: https://www.newton.ac.uk 🎥| Main Channel:    / @isaacnewtoninstitute   🐦| Twitter:   / newtoninstitute   💬| Facebook:   / newton.institute   📷| Instagram:   / isaacnewtoninstitute   🔗| LinkedIn:   / isaac-newton-institute-for-mathematical-sc...   SEMINAR ROOMS 🥇| INI Seminar Room 1:    / @iniseminarroom1   🥈| INI Seminar Room 2:    / @iniseminarroom2   🛰️| INI Satellite Events:    / @inisatellite   ABOUT The Isaac Newton Institute is a national and international visitor research institute. It runs research programmes on selected themes in mathematics and the mathematical sciences with applications over a wide range of science and technology. It attracts leading mathematical scientists from the UK and overseas to interact in research over an extended period. 👉 Learn more about us and our events here: https://www.newton.ac.uk