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Session: Instability and Transition 7
Session starts: Friday 28 August, 10:30
Presentation starts: 12:00
Room: Room A

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Chris Brown (University of Cambridge)
Stuart Dalziel (University of Cambridge)

Abstract:
This talk discusses the effects of a rigid solid boundary impeding the evolution of the Rayleigh-Taylor (RT) instability. The introduction of an obstacle completely alters the evolution of RT growth, instead of mixing the domain rapidly, a quasi-steady flow, rich in dynamics is established for long periods of time. Using a combination of low Atwood number experiments and ILES simulations, this talk will present a non-dimensional analytical model for a multi-stage mixing process, discussing the effects of the opening size and topology on the density change of each layer, buoyancy driven flux through the opening and mixing efficiency.