4:10-4:35 p.m. Presentation
“Bubble Rising Velocity in Strong Turbulence”
Presented by ASHWANTH SALIBINDLA (Prof. Rui Ni)
For bubbly ship wakes and breaking waves, the mean rising velocity of bubbles determines their residence time inside the carrier phase and the resulting surface bubble concentration over time. We carried out an experimental study of the rising velocity of bubbles with size ranging from 1 mm to 10 mm. A vertical water tunnel V-ONSET has been developed to generate strong turbulence with a large energy dissipation rate (ϵ~0.1 m2/s3) and a controllable mean flow. In this presentation, I will introduce the facility and also talk about some results regarding the rise velocity of bubbles in turbulence. We will compare our results with previous experimental and numerical works in this area.
4:35-5:00 p.m. Presentation
“Spatio-Temporal Dynamics of Turbulent Flows in the Presence Of Waves”
Presented by PATRICIO CLARK DI LEONI (Profs. Tamer Zaki & Charles Meneveau)
Waves, eddies, horizontal winds, vortices, and many other structures can coexist and interact in a turbulent flow. Their identification and extraction in simulations and experiments is a major challenge. We show how, with the aid of spatiotemporal spectra, we can study the interplay between waves and eddies in rotating, free surface, stratified and quantum flows. We present results on the existence of a mixed regime of waves and solitons in surface wave turbulence, links between inertial waves and the development of large-scale horizontal winds in stratified turbulence, quantification of bounds for the validity of wave turbulence in rotating flows, and links between the depletion of helicity and kelvin waves in quantum turbulence.