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Interface dynamics: mechanisms of stabilization and destabilization and structure of flow fields

Event Type: 
Date and Time: 
Friday, December 13, 2019 - 16:30
Location: 
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Speaker(s): 
Professor and Chair Snezhana I. Abarzhi

Interfacial mixing and transport are nonequilibrium processes coupling kinetic to macroscopic scales. They occur in plasmas, fluids, and materials over celestial events to atoms. Grasping their fundamentals can advance a broad range of disciplines in science, mathematics, and engineering. This work focuses on the long-standing classic problem of stability of a phase boundary - a fluid interface that has a mass flow across it. We briefly review the recent advances and challenges in theoretical and experimental studies, develop the general theoretical framework directly linking the microscopic interfacial transport to the macroscopic flow fields, discover the new mechanisms of interface stabilization and destabilization for both inertial and accelerated dynamics, and chart perspectives for future research.

The work is supported by the University of Western Australia (AUS) via project grant 10101047, and the National Science Foundation (USA) via award 1404449.

Abarzhi et al 2019 Proc Natl Acad Sci USA 116 (37) 18218. https://doi.org/10.1073/pnas.1714500115.
Ilyin et al 2019 Europhysics Letters 125, 14002. https://doi.org/10.1209/0295-5075/125/14002.
Ilyin et al 2018 Physics of Plasmas 25, 112105. https://doi.org/10.1063/1.5008648.
Ilyin et al 2018 http://arxiv.org/abs/1901.04575.

Bio: 
Snezhana Abarzhi works at the University of Western Australia as Professor and Chair of Applied Mathematics. Before the University of Western Australia, she worked at Carnegie Mellon University, University of Chicago, Stanford University and State University of New York at Stony Brook in the USA, as well as internationally (Osaka University in Japan, University of Bayreuth in Germany, Landau Institute for Theoretical Physics in Russia). Snezhana Abarzhi's research interests are in Applied Mathematics (applied analysis, partial differential equations, boundary value problems) and in Theoretical Applied and Physics (fluids, plasmas, materials). The focus of Dr. Abarzhi’s research is on fluid instabilities and interfacial mixing. Her contribution to this field is in rigorous physics-based theory for fundamentals of non-equilibrium dynamics, interfaces and mixing. 2019 Special Feature Issue on ‘Interfaces and Mixing’ of the Proc Natl Acad Sci USA https://www.pnas.org/page/about/special-features. http://onlinedigeditions.com/publication/?i=629516#{%22issue_id%22:629516,%22page%22:0}.