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SUMMARY:The energetics of moving between statistically steady states in fl
 ows driven by buoyancy and wind - Dr John Craske (Imperial College London)
DTSTART:20190531T120000Z
DTEND:20190531T130000Z
UID:TALK123199@talks.cam.ac.uk
CONTACT:Amélie Lamarquette
DESCRIPTION:Flows in confined spaces that are driven by internal buoyancy 
 and\nexternal wind can possess multiple steady states. In this talk we\nwi
 ll discuss the robustness of such systems by quantifying their\npropensity
  to switch between steady states when they are subjected\nto temporal chan
 ges in the wind. The specific case we consider is\nflow in an `emptying fi
 lling box'\, consisting of a single volume\nwith high- and low-level openi
 ngs\, driven by an isolated internal\nsource of buoyancy and an opposing w
 ind. By considering the\nsystem's energetics and phase space\, we explain 
 why the\nventilation of the resulting stratified system is less susceptibl
 e\nto being permanently reversed by the wind than the ventilation of\na sp
 ace with uniform buoyancy.
LOCATION:JDB Seminar Room\, CUED
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