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 Q09: Cavitation and Multiphase Flows
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B214
Chair: Aren Hellum, Naval Undersea Warfare Center
Abstract ID: BAPS.2018.DFD.Q09.4
Abstract: Q09.00004 : Experimental investigation of turbulence within unsteady cavitation
1:29 PM–1:42 PM
Presenter:
Ilyass Khlifa
(Arts et Metiers ParisTech)
Authors:
Ilyass Khlifa
(Arts et Metiers ParisTech)
Olivier Coutier-Delgosha
(Virginia Tech, Arts et Metiers ParisTech)
An experimental study based on fast X-ray imaging was performed to investigate the turbulence within unsteady cavitating flows. Cloud cavitation in a small scale Venturi type section, characterized by periodical large-scale oscillations of the sheet cavity, was investigated. The flow was seeded with radio-opaque tracers, and acquisition was performed at the Advanced Photon Source facility of the Argonne National Laboratory. Simultaneous measurements of the liquid and the vapour velocities were obtained by PIV-like image cross-correlations applied to particle and bubble images, while the distribution of the vapour volume fraction was derived from local X-ray absorption. These data were used to determine the distributions of the turbulent kinetic energy k and the turbulent shear stress τ, for several conditions of cavitating flows. The results were then confronted to Reboud’s modification of two-equation eddy viscosity models, which is commonly used to improve the turbulence modelling by reducing the mixture turbulent viscosity in the low void ratio areas of the flow. A nice agreement between the current results and this empirical modification was obtained, explaining a posteriori why Reboud’s correction leads to major improvements in the simulation of cloud cavitation.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q09.4
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