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SUMMARY:The evolution of a stratified turbulent cloud.   - Dr Andrea Maffi
 oli  CUED                  
DTSTART:20130503T120000Z
DTEND:20130503T131500Z
UID:TALK44737@talks.cam.ac.uk
CONTACT:ROBERTA TRUPIANO
DESCRIPTION:Turbulence events in nature are often in the form of localized
  outbursts without a continuous source of energy\; for example\, in the at
 mosphere\, patches of turbulence\, or _turbulent clouds_\, are created by 
 local shear instabilities or internal gravity wave breaking. These events 
 occur at scales of a few\nkilometers\, and at this scale the flow is weakl
 y influenced by the Earth's rotation but strongly influenced by the stable
  density stratification\,\nwhich motivates the study of decaying stratifie
 d turbulent clouds. Through experiments and numerical simulations we show 
 that the edge dynamics of these clouds can be subdivided into fluid intrus
 ions and predominantly horizontal internal gravity waves\, whose propagati
 on is due to the horizontal forcing of the intrusions. We present results 
 from the DNS on the linearity and energetics of the waves\, which demonstr
 ate that the internal gravity waves transport up to ~15% of the energy awa
 y from the turbulent cloud. Finally\, an attempt was made to perform an an
 gular decomposition of the energetic contribution of the internal gravity 
 waves\, i.e. to determine whether the horizontal waveforms (as distinct fr
 om the more commonly observed inclined waves) dominate the energetics of t
 he problem.  
LOCATION:LR10\, Baker Building (South wing).
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