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UID:20250511T075131EDT-5330uE87eR@132.216.98.100
DTSTAMP:20250511T115131Z
DESCRIPTION:Turbulence enhancement of droplet collisions: how do droplets g
 row in turbulent clouds?\n\nAbstract\n\nAs one of the major features of wa
 rm\, cumulus clouds\, turbulence has long been argued to accelerate drople
 t collision-coalescence process and thus shorten the warm rain initiation 
 time. Both stochastic models and direct numerical simulation (DNS) have ob
 served a significant turbulent enhancement of geometric collision kernel. 
 And LES studies proposed that turbulence may even increase the amount of r
 ainfall. However\, how much contribution the turbulence make from a quanti
 tative perspective is still debatable. In addition\, studies on hydrodynam
 ic effects\, which determines the collision efficiency\, are insufficient 
 to reach a quantitative agreement\, and results from DNS studies on the ev
 olution of droplet size distribution(DSD) are rare. A more quantitative ev
 aluation of the effect of small-scale turbulent is needed to unfold the my
 stery of warm rain initiation process. \n	We developed a DNS model to simul
 ate the droplet collision-coalescence process inside cloud adiabatic cores
 \, where the turbulence is assumed to be homogeneous and isotropic. The pu
 rpose of our study is to quantify the influence of turbulence (Reynolds nu
 mber and eddy dissipation rate) on droplet growth to shed light on paramet
 erizations of turbulent collision kernel. Recently\, the model includes dr
 oplet hydrodynamic effect by explicitly resolving the droplet disturbance 
 flow. In this presentation\, I will walk you through the growth history of
  a droplet by collision and coalescence. Recent attempts on studying the c
 ollision efficiency and DSD evolution under turbulence will also be given.
 \n
DTSTART:20160120T193000Z
DTEND:20160120T200000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Student Seminar: Sisi Chen
URL:/meteo/channels/event/student-seminar-sisi-chen-25
 5066
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