ADIW01 | Prof. Francesco Paparella | Layering in Fingering Convection: an introductory review
Speaker: Professor Francesco Paparella (New York University) Date: 17th Jan 2024 - 9:00 to 10:00 Venue: INI Seminar Room 1 Title: Layering in Fingering Convection: an introductory review Event: (ADIW01) Layering — A structure formation mechanism in oceans, atmospheres, active fluids and plasmas Abstract: Fingering convection occurs when the density of a fluid is affected bytwo scalars: a slowly diffusing one, which, if acting alone, wouldcreate a top-heavy stratification, and a fast-diffusing one, arrangedin such a way as to produce an overall bottom-heavy stratification.The different diffusivities of the two buoyancy-changing scalars leadsto a well-understood instability of the motionless state, which resultsin the formation of small buoyancy-carrying structures (known as saltfingers) moving in a fluid which, at scales larger than that of thosesmall structures, maintains a bottom-heavy stratification, with aconstant vertical density gradient. When this kind of convection issufficiently vigorous, the large-scale density profile may undergo asubsequent instability which disrupts the constancy of its verticalgradient, and leads to a layered density profile where well-mixedlayers are alternated to layers where density assumes a steep verticalgradient. Several mechanisms have been proposed in order to explainthe layer-forming instability. Some emphasize the peculiarities of thedoubly-diffusive mechanisms that continuously creates small-scalesbuoyancy anomalies, others mimic long-standing models of layerformation in mechanically stirred, stably-stratified fluids. Finally,a recent work that subsumes most of these (apparently?) distinctmechanisms within a single framework will be discussed. ------------------- FOLLOW US 🌐| Website: https://www.newton.ac.uk 🎥| Main Channel: https://www.youtube.com/@isaacnewtoninstitute 🐦| Twitter: https://twitter.com/NewtonInstitute 💬| Facebook: https://www.facebook.com/newton.institute 📷| Instagram: https://www.instagram.com/isaacnewtoninstitute 🔗| LinkedIn: https://www.linkedin.com/company/isaac-newton-institute-for-mathematical-sciences SEMINAR ROOMS 🥇| INI Seminar Room 1: https://www.youtube.com/@iniseminarroom1 🥈| INI Seminar Room 2: https://www.youtube.com/@iniseminarroom2 🛰️| INI Satellite Events: https://www.youtube.com/@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
Speaker: Professor Francesco Paparella (New York University) Date: 17th Jan 2024 - 9:00 to 10:00 Venue: INI Seminar Room 1 Title: Layering in Fingering Convection: an introductory review Event: (ADIW01) Layering — A structure formation mechanism in oceans, atmospheres, active fluids and plasmas Abstract: Fingering convection occurs when the density of a fluid is affected bytwo scalars: a slowly diffusing one, which, if acting alone, wouldcreate a top-heavy stratification, and a fast-diffusing one, arrangedin such a way as to produce an overall bottom-heavy stratification.The different diffusivities of the two buoyancy-changing scalars leadsto a well-understood instability of the motionless state, which resultsin the formation of small buoyancy-carrying structures (known as saltfingers) moving in a fluid which, at scales larger than that of thosesmall structures, maintains a bottom-heavy stratification, with aconstant vertical density gradient. When this kind of convection issufficiently vigorous, the large-scale density profile may undergo asubsequent instability which disrupts the constancy of its verticalgradient, and leads to a layered density profile where well-mixedlayers are alternated to layers where density assumes a steep verticalgradient. Several mechanisms have been proposed in order to explainthe layer-forming instability. Some emphasize the peculiarities of thedoubly-diffusive mechanisms that continuously creates small-scalesbuoyancy anomalies, others mimic long-standing models of layerformation in mechanically stirred, stably-stratified fluids. Finally,a recent work that subsumes most of these (apparently?) distinctmechanisms within a single framework will be discussed. ------------------- FOLLOW US 🌐| Website: https://www.newton.ac.uk 🎥| Main Channel: https://www.youtube.com/@isaacnewtoninstitute 🐦| Twitter: https://twitter.com/NewtonInstitute 💬| Facebook: https://www.facebook.com/newton.institute 📷| Instagram: https://www.instagram.com/isaacnewtoninstitute 🔗| LinkedIn: https://www.linkedin.com/company/isaac-newton-institute-for-mathematical-sciences SEMINAR ROOMS 🥇| INI Seminar Room 1: https://www.youtube.com/@iniseminarroom1 🥈| INI Seminar Room 2: https://www.youtube.com/@iniseminarroom2 🛰️| INI Satellite Events: https://www.youtube.com/@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