SUBJECT: Ph.D. Proposal Presentation
BY: Prasoon Suchandra
TIME: Wednesday, October 28, 2020, 4:00 p.m.
TITLE: Statistically stationary experiments on coupled buoyancy-driven and shear-driven instabilities
COMMITTEE: Dr. Devesh Ranjan, Chair (ME)
Dr. Cyrus Aidun (ME)
Dr. David Hu (ME)
Dr. Ellen Mazumdar (ME)
Dr. Joseph Oefelein (AE)


This work is on investigating coupled buoyancy-driven (Rayleigh-Taylor) and shear-driven (Kelvin-Helmholtz) instabilities using statistically stationary experiments. Employing diagnostics like particle image velocimetry (PIV) and laser induced fluorescence (LIF) in gas tunnels, we make velocity-density field measurements in order to study how dynamics and mixing are linked in variable density flows. In addition to extracting quantities of statistical importance from our measurements (like density-velocity correlations), we also look at how different forces (for example buoyancy and shear) fundamentally drive variable density mixing process (using nondimensional parameters like Richardson number), and how such a mixing process reaches an asymptotic state (using the concept of mixing efficiency). These experiments are of immense significance for atmospheric and oceanic sciences, and variable density turbulence modeling.