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SUMMARY:Experimental detection of large-scale flow structures in Rayleigh-
 Taylor instability  - Stefan Nixon (DAMTP)
DTSTART:20230210T130000Z
DTEND:20230210T140000Z
UID:TALK196387@talks.cam.ac.uk
CONTACT:108503
DESCRIPTION:This talk will present the current state of our research. It c
 an be divided into two categories\; experimental and numerical. With regar
 d to experiments\, significant progress towards a full three-dimensional d
 ata set has been made\, in the form of successful simultaneous stereoscopi
 c particle image velocimetry and planar laser-induced fluorescence experim
 ents. The velocity fields collected from these experiments are used to per
 form some preliminary large-scale structure detection. We also present pro
 gress in the development of a new method for analysing data collected by p
 lanar laser-induced fluorescence. From a numerical perspective\, we show d
 irect numerical simulations of multimode Rayleigh-Taylor instability using
  the three-dimensional\, finite volume code TurMix3D. These simulations fa
 cilitate a first look at the attracting and repelling manifolds defined by
  finite-time Lyapunov exponents\, which are produced during Rayleigh-Taylo
 r mixing. We also present a comparison of several vortex detection methods
 \, including the first application of rortex-shear decomposition to Raylei
 gh-Taylor instability. This paves the way for future work aimed at bringin
 g these two strands of research together. This goal will involve the colle
 ction of a full three-dimensional three-component data set\, the developme
 nt of a model for our initial conditions so as to reproduce our experiment
 s numerically\, and the analysis of large-scale structures using the finit
 e-time Lyapunov exponents and the vortex detection methods we have impleme
 nted. 
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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