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.Q09.11
Abstract: Q09.00011 : Cavitation Dynamics in Wakes Behind Bluff Bodies*
3:00 PM–3:13 PM
Presenter:
Lisa Deijlen
(Univ of Michigan - Ann Arbor)
Authors:
Lisa Deijlen
(Univ of Michigan - Ann Arbor)
Anubhav Bhatt
(Univ of Michigan - Ann Arbor)
Harish Ganesh
(Univ of Michigan - Ann Arbor)
Juliana Wu
(Univ of Michigan - Ann Arbor)
Steven Ceccio
(Univ of Michigan - Ann Arbor)
The shedding frequency of cavitating wakes behind bluff bodies depends strongly on the extent of the cavitation in the near wake. As the extent of cavitation increases from inception to an attached super-cavity, the wake shedding frequency attains a peak. The physical mechanism responsible for these observed changes in shedding dynamics with the extent of the wake cavitation is yet to be fully understood. In the current study, we employ time resolved X-ray densitometry and high-speed videography to study the cavitation dynamics in the wake of a triangular, nominally two-dimensional wedge in a re-circulating water tunnel to understand the underlying mechanisms responsible for cavity formation and shedding. It is proposed that alteration of the near wake dynamics by cavitation and the effect of compressibility in bubbly wakes that can explain the observed change in shedding dynamics. This hypothesis is tested via injection of non-condensable gas into the near wake of the bluff body.
*This work was funded by Office of Naval Research (ONR), grant number N00014-14-1-0292, under program manager Dr. Ki-Han Kim
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q09.11
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