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SUMMARY:Multiscale phenomena in Fluid Mixing: from Droplets to Ocean Dynam
 ics - Nairita Pal (Los Alamos National Laboratory)
DTSTART:20220307T160000Z
DTEND:20220307T170000Z
UID:TALK170669@talks.cam.ac.uk
DESCRIPTION:I&nbsp\;will talk about the physics of multicomponent fluid mi
 xing and phase separation\, studied using (a) a time-dependent Ginzburg La
 ndau formulation\, and numerically implemented as a phase-field model and 
 (b) a spectral closure model borrowed from turbulence theory. Due to exter
 nal forcing\, an initially quiescent system of two fluids exhibits highly 
 nonlinear spatiotemporal evolution. The nonlinear mass and energy transpor
 t across the different length scales of the system during the mixing proce
 ss will be discussed. I will show how these spatiotemporal dynamics exhibi
 t universal characteristics independent of the system parameters\, e.g.\, 
 the magnitude of external forcing.&nbsp\;&nbsp\;Such analytical and numeri
 cal study of mixing is essential to extract universal length and time scal
 es in many industrial\, as well as natural phenomena\, e.g.\, in microflui
 dics (~length scales in micrometers) or climate-science (e.g.\, mixing in&
 nbsp\;global oceans&nbsp\;~ kilometers). Capturing such universal features
  using analytical closure models (and also numerical simulations) is mathe
 matically challenging\, and rarely attempted before.\n&nbsp\;\nIn the end\
 , I will briefly talk about my work on fluid mixing in realistic global oc
 eans\, in particular\, mixing due to ocean&nbsp\;tides\,&nbsp\;and their i
 mpact on global climate variability.
LOCATION:Seminar Room 1\, Newton Institute
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