Seminario Colombiano Matemática Aplicada y Computacional

Title: Numerical simulation of immiscible two-phase Rayleigh-Taylor turbulence

Speaker: Alexei A. Mailybaev (IMPA, Rio de Janeiro)

Contacto local: Juan Galvis (jcgalvisa@unal.edu.co)

Abstract:

When a heavy fluid is placed on top of a lighter fluid the so-called Rayleigh-Taylor instability can develop, which eventually leads to a mixing layer with a turbulent motion called Rayleigh-Taylor turbulence. When two fluids are immiscible, e.g. like water and oil or liquid and gas, this process leads to an emulsion-like state with a multitude of small droplets that constantly merge and split. Only very few numerical methods can model such complex behavior. Here we present the results of direct numerical simulations of the two-dimensional Rayleigh-Taylor turbulence with a multicomponent lattice Boltzmann method implemented on GPUs. We compare our results with the phenomenological predictions constructed in analogy with the Kolmogorov theory of turbulence.

This is a joint work with Hugo S. Tavares, Luca Biferale and Mauro Sbragaglia. Preprint of the paper: https://arxiv.org/abs/2009.00054.

Date: Friday September 18, 8:00 a.m. Talks start at 8:10 a.m.

Place: Via zoom or google meet.