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SUMMARY:Two-phase gravity currents containing a finite volume of fluid - D
 r Madeleine Golding\, DAMTP                                             
DTSTART:20130607T120000Z
DTEND:20130607T131500Z
UID:TALK44745@talks.cam.ac.uk
CONTACT:ROBERTA TRUPIANO
DESCRIPTION:I will present a model for a two-phase gravity current resulti
 ng from the release of a finite volume of fluid into a porous medium satur
 ated with a second\, immiscible fluid. The scenario is motivated by the ge
 ological storage of carbon dioxide (CO2)\, or the aftermath of a chemical 
 spill. As it spreads\, the fluid in a two-phase gravity current only parti
 ally displaces the ambient fluid\, leading to a non-uniform saturation dis
 tribution. This is the key difference from its single-phase counterpart an
 d gives rise to quite different behaviour.\n\nThe three key physical two-p
 hase phenomena incorporated by the model are capillary pressure and relati
 ve permeability\, which are functions of saturation\, and residual trappin
 g\, which depends on the historical evolution of the saturation distributi
 on. When a finite volume spreads\, such as a volume of CO2 after injection
  has ceased\, the gravity current is particularly complex to model because
  the height of the current increases towards the front and recedes in the 
 middle. This leads to different capillary pressure and relative permeabili
 ty curves in the two regions within the same current\, which must be model
 led consistently. Particularly interesting to the geological storage of CO
 2 is residual trapping\, where fluid is left immobilised behind the recedi
 ng boundary\, and I will present a very interesting result which shows tha
 t the choice of trapping model can determine whether the model predicts an
  infinitely spreading gravity current\, or one that will eventually stop!\
 n
LOCATION:LR3B\, Inglis building.
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