Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J26: Flow Instability: Rayleigh-Taylor II
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 151A
Chair: Balu Nadiga, LANL
Abstract: J26.00005 : Experimental Detection of Large-Scale Flow Structures in Rayleigh–Taylor instability*
5:27 PM–5:40 PM
Presenter:
Stefan S. S Nixon
(Univ of Cambridge)
Authors:
Stefan S. S Nixon
(Univ of Cambridge)
Stuart B Dalziel
(Univ of Cambridge)
Romain Watteaux
(CEA)
Collaboration:
I would like to thank the technicians at the GK Batchelor Laboratory for their support
Large-scale structures are found using a Lagrangian-filtering based technique, which allows us to divide the flow into two structure fields b+ (downward moving) and b- (upward moving). The experimentally determined b± fields show reasonable agreement with previous numerical work and the mean per-structure average profiles show good agreement with theoretical predictions from two-fluid two-structure models. Thus, providing physical evidence for their existence across the mixing zone.
*SSN would like to acknowledge our funding from CEA.
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