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SUMMARY:Layering in Fingering Convection: an introductory review - Frances
 co Paparella (New York University)
DTSTART:20240117T090000Z
DTEND:20240117T100000Z
UID:TALK208483@talks.cam.ac.uk
DESCRIPTION:Fingering convection occurs when the density of a fluid is aff
 ected bytwo scalars: a slowly diffusing one\, which\, if acting alone\, wo
 uldcreate a top-heavy stratification\, and a fast-diffusing one\, arranged
 in such a way as to produce an overall bottom-heavy stratification.The dif
 ferent diffusivities of the two buoyancy-changing scalars leadsto a well-u
 nderstood instability of the motionless state\, which resultsin the format
 ion of small buoyancy-carrying structures (known as saltfingers) moving in
  a fluid which\, at scales larger than that of thosesmall structures\, mai
 ntains a bottom-heavy stratification\, with aconstant vertical density gra
 dient. &nbsp\;When this kind of convection issufficiently vigorous\, the l
 arge-scale density profile may undergo asubsequent instability which disru
 pts the constancy of its verticalgradient\, and leads to a layered density
  profile where well-mixedlayers are alternated to layers where density ass
 umes a steep verticalgradient. &nbsp\;Several mechanisms have been propose
 d in order to explainthe layer-forming instability. Some emphasize the pec
 uliarities of thedoubly-diffusive mechanisms that continuously creates sma
 ll-scalesbuoyancy anomalies\, others mimic long-standing models of layerfo
 rmation in mechanically stirred\, stably-stratified fluids. Finally\,a rec
 ent work that subsumes most of these (apparently?) distinctmechanisms with
 in a single framework will be discussed.
LOCATION:Seminar Room 1\, Newton Institute
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