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DTSTART:20170326T030000
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DTSTART:20171029T020000
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DTSTAMP:20260428T224334Z
UID:58ddf0446013a488635390@ist.ac.at
DTSTART:20170523T140000
DTEND:20170523T150000
DESCRIPTION:Speaker: Alfredo Soldati\nhosted by Björn Hof\nAbstract: Turbu
 lent fluids and small particles or droplets or bubbles are common to a num
 ber of key processes in energy production\, product industry and environme
 ntal phenomena. In modelling\, the dispersed phase is usually assumed unif
 ormly distributed. Indeed\, it is not. Dispersed phases can be focused by 
 turbulence structures and can have a time-space distribution which barely 
 resembles prediction of simplified averaged modelling. Preferential distri
 bution controls the rate at which sedimentation and re-entrainment occur\,
  reaction rates in burners or reactors and can also determine raindrop for
 mation and\, through plankton\, bubble and droplet dynamics\, the rate of 
 oxygen-carbon dioxide exchange at the ocean-atmosphere interface. In this 
 talk\, we will review a number of physical phenomena in which particle seg
 regation in turbulence is a crucial effect describing the physics by means
  of Direct Numerical Simulation of turbulence underlining the presence of 
 the strong shear which flavors wall turbulence with a unique multiscale as
 pect and adds intricacy to the role of inertia\, gravity and buoyancy in i
 nfluencing particle motion. The role of free surface turbulence in dispers
 ing and clustering the light particles such as plancton will be also descr
 ibed.\n\n\n\nFigure 1. Light particles floating on a flat shear-free surfa
 ce of a turbulent open water. This configuration mimics the motion of buoy
 ant matter (e.g. phytoplankton\, pollutants or nutrients). Correlation bet
 ween floater clusters and surface divergence Ñ2D. Floaters segregatein Ñ
 2D < 0 regions (in blue\, footprint of sub-surface downwelings) avoiding f
 ootprint of sub-surface upwelings). Particle buoyancy induces clusters tha
 t evolve towards a long-term fractal distribution in a time much longer th
 an the Lagrangian integral fluid time scale\, indicating that such cluster
 s over-live the surface turbulent structures which produced them?.\n
LOCATION:Seminar Room\, Lab Building East\, ISTA
ORGANIZER:rsix@ist.ac.at
SUMMARY:Alfredo Soldati: Physics and computations of turbulent dispersed fl
 ows: Macro- Consequences from Micro
URL:https://talks-calendar.ista.ac.at/events/628
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