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SUMMARY:Gravity currents flowing up a slope: laboratory experiments\, shal
 low-water and Large Eddy simulations
DTSTART:20150417T121500
DTEND:20150417T131500
DTSTAMP:20260411T111222Z
UID:df3412628b66adf12c9cc9e968a5b42093520d09b4d2d6361410b751
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr Claudia Adduce\, University Roma Tre\, Italy\nAbstrac
 t: The dynamics of unsteady gravity currents propagating up a slope are in
 vestigated by laboratory experiments\, shallow-water and Large Eddy Simula
 tions. Different runs were carried out by varying the initial density of t
 he lock fluid and the bed upslope. As a gravity current moves up a slope\,
  the dense layer becomes thinner\, and an accumulation region of dense flu
 id in the initial part of the tank occurs. The current speed decreases as 
 the bed upslope increases\, and for the highest up sloping angles\, the gr
 avity current stops before reaching the end of the tank. A two-layer shall
 ow-water model is developed and benchmarked against laboratory experiments
 . The present model accounts for the mixing between the two layers\, the f
 ree surface\, and the space-time variations of the density. The effect of 
 the horizontal density gradient in the simulation of gravity currents is i
 nvestigated by comparing the numerical results of both the present model a
 nd the model proposed by Adduce et al. (2012) with laboratory measurements
 . The present model reproduces both the current shape and the front positi
 on better than the Adduce et al. (2012) model\, in particular\, for gravit
 y currents flowing up a slope. Large Eddy Simulations are used to investig
 ate the mixing processes between the dense current and the ambient fluid\,
  revealing a decrease of mixing as the steepness of the bottom increases. 
 The total energy budget is presented to highlight the effect of the up-slo
 ping boundary on the flow dynamics. When a gravity current starts to devel
 op\, mixing strongly depends on the evolution of Kelvin-Helmholtz billows.
  When these structures lose their coherence\, three-dimensional features o
 f the flow appear more evident and cause mixing.\nBio :\nClaudia Adduce is
  Associate Professor with tenure at the Department of Engineering of the U
 niversity Roma Tre\, Italy. She completed her PhD at the University Roma T
 re and she worked at the Department of Physical Oceanography of Woods Hole
  Oceanographic Institution (USA). She teaches Environmental Hydraulics for
  Civil Engineers at the University Roma Tre. Her research focuses on: grav
 ity currents\, internal waves\, eddies interaction with seamounts and isla
 nds\, local scouring downstream of hydraulic structures\, sloshing of stra
 tified fluids.
LOCATION:GC B3 30 http://plan.epfl.ch/?lang=fr&room=GCB330
STATUS:CONFIRMED
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