Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session L09: Bubbly Flows
4:05 PM–6:41 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B214
Chair: Brian Elbing, Oklahoma State University
Abstract ID: BAPS.2018.DFD.L09.1
Abstract: L09.00001 : Energy cascade in a homogeneous swarm of bubbles rising in a vertical channel
4:05 PM–4:18 PM
Presenter:
Bruño Fraga
(University of Birmingham (UK))
Authors:
Bruño Fraga
(University of Birmingham (UK))
Chris C.K. Lai
(Los Alamos National Laboratory)
Ronald Chan
(Stanford University)
Michael Dodd
(Stanford University)
The cascade of kinetic energy is a defining characteristic of fluid turbulence. For single-phase flows, the Richardson-Kolmogorov phenomenology provides a satisfactory first approximation of the energy cascade with which many existing turbulence models/theories are based. However, the phenomenology has not been demonstrated in two-phase flows where the production by the dispersed phase is an additional source of liquid turbulent kinetic energy.
We use bubble-resolved, direct numerical simulations to investigate the energy cascade in homogeneous swarms of air bubbles rising a vertical channel. We consider millimeter-sized bubbles with a bubble Reynolds number of 500. The von Karman-Howarth-Monin (K-H-M) equation is adapted for the two-phase flow and used to quantify the interscale energy transfer and to compute the scale-by-scale energy budget.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.L09.1
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