Error message

Notice: Undefined offset: 0 in include() (line 35 of /home/it/www/www-icts/sites/all/themes/riley/templates/views/views-view-fields--related-file-field-collection-view.tpl.php).
Seminar
Speaker
Balachandra Suri (Institute of Science and Technology (IST), Austria)
Date & Time
Thu, 21 January 2021, 15:30 to 17:00
Venue
Online seminar
Resources
Abstract

Turbulence is widely regarded as the last unsolved problem of classical physics. Despite the availability of well-defined governing equations, a tractable framework that ``predicts'' the dynamical and statistical properties of (even weak) turbulence has eluded scientists. In this talk, we demonstrate that such a framework can be developed using unstable nonchaotic solutions of the Navier-Stokes equation, called Exact Coherent States (ECS). In a moderately turbulent quasi-two-dimensional laboratory flow, we  show that fleeting appearance of coherent structures is related to the dynamical significance of ECS in turbulence.  We then construct a low-dimensional model for flow dynamics near an ECS and forecast turbulent evolution for a short duration.  Analyzing their statistical significance, we show that frequently appearing ECS capture statistical averages (e.g., rate of energy dissipation) of turbulent flows accurately. Finally, we  provide a geometrical description of transient turbulence using dynamical connections between ECS.

Please click on the link https://zoom.us/j/97073248248?pwd=YmJsWnRuODlWcVhiZGxPMzhUVUFPUT09 to join the seminar
Meeting ID: 970 7324 8248
Passcode: 917334