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UID:ai1ec-15783@me.jhu.edu
DTSTAMP:20180221T044930Z
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DESCRIPTION:3:00 p.m. Presentation\n“Large Eddy Simulation Including Popula
tion Dynamics Model for Polydisperse Droplet Evolution in Turbulence”\n Pr
esented by ADITYA KANDASWAMY AIYER (Adviser: Prof. Meneveau)\nPrevious stu
dies have shown that dispersion patterns of oil droplets in the ocean foll
owing a deep sea oil spill depend critically on droplet diameter. Hence pr
edicting the evolution of the droplet size distribution is of critical imp
ortance for predicting macroscopic features of dispersion in the ocean. We
adopt a population dynamics model of polydisperse droplet distributions f
or use in LES. We generalize a breakup model from Reynolds averaging appro
aches to LES in which the breakup is modeled as due to bombardment of drop
lets by turbulent eddies of various sizes. The breakage rate is expressed
as an integral of a collision frequency times a breakage efficiency over a
ll eddy sizes.An empirical fit to the integral is proposed in order to avo
id having to recalculate the integral at every LES grid point and time ste
p. The fit is tested by comparison with various stirred tank experiments.
As a flow application for LES we consider a jet of bubbles and large dropl
ets injected at the bottom of the tank. The advected velocity and concentr
ation fields of the droplets are described using an Eulerian approach. We
study the change of the oil droplet distribution due to breakup caused by
interaction of turbulence with the oil droplets.\nAcknowledgement: This re
search was made possible by a grant from the Gulf of Mexico Research Initi
ative.\n\n3:25 p.m. Presentation\n“Flow-Induced Flutter of Multiple Invert
ed Flags for Improved Energy Harvesting”\n Presented by AARON RIPS (Advise
r: Prof. Mittal)\nMulti-inverted flag configurations undergoing flow-induc
ed flutter have been studied using a coupled fluid-structure interaction s
olver. Both tandem and side-by-side configurations are examined to better
understand the dynamics and energy harvesting potential of these systems\,
and to identify configurations that enhance energy harvesting. Parametric
sweeps over the separation distance demonstrate a rich variety of couplin
g modes and system dynamics. A number of operational regimes have been ide
ntified for this two-flag system and correlated to the vortex dynamics. Si
mulations indicate that the coupling between flags can be used to enhance
overall energy harvesting potential.
DTSTART;TZID=America/New_York:20170915T150000
DTEND;TZID=America/New_York:20170915T160000
LOCATION:316 Hodson Hall
SEQUENCE:0
SUMMARY:Graduate Seminar in Fluid Mechanics 530.807
URL:https://me.jhu.edu/events/graduate-seminar-fluid-mechanics-530-807-14/
X-COST-TYPE:free
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n\\n\\n*3
:00 p.m. Presentation*

\n*“**Large Eddy Simulation Including Population Dynamics Model for Pol
ydisperse Droplet Evolution in Turbulence**”*<
/strong>

**\n*** *Presented by **ADITYA KA
NDASWAMY AIYER **(Adviser: Prof. Meneveau)

\nPrevious studies
have shown that dispersion patterns of oil droplets in the ocean followin
g a deep sea oil spill depend critically on droplet diameter. Hence predic
ting the evolution of the droplet size distribution is of critical importa
nce for predicting macroscopic features of dispersion in the ocean. We ado
pt a population dynamics model of polydisperse droplet distributions for u
se in LES. We generalize a breakup model from Reynolds averaging approache
s to LES in which the breakup is modeled as due to bombardment of droplets
by turbulent eddies of various sizes. The breakage rate is expressed as a
n integral of a collision frequency times a breakage efficiency over all e
ddy sizes.An empirical fit to the integral is proposed in order to avoid h
aving to recalculate the integral at every LES grid point and time step. T
he fit is tested by comparison with various stirred tank experiments. As a
flow application for LES we consider a jet of bubbles and large droplets
injected at the bottom of the tank. The advected velocity and concentratio
n fields of the droplets are described using an Eulerian approach. We stud
y the change of the oil droplet distribution due to breakup caused by inte
raction of turbulence with the oil droplets.

\n*Acknowledgement:
**This research was made possible by a grant from the Gulf of Mexic
o Research Initiative.*

\n

\n*3:25 p.m. Presenta
tion*

\n*“**Flow-Ind
uced Flutter of Multiple Inverted Flags **for Impr
oved Energy Harvesting**”*

\n* *~~Presented by ~~**AARON RIPS **(Adviser
: Prof. Mittal)

~~\n~~Multi-inverted flag configurations undergoing flow
-induced flutter have been studied using a coupled fluid-structure interac
tion solver. Both tandem and side-by-side configurations are examined to b
etter understand the dynamics and energy harvesting potential of these sys
tems\, and to identify configurations that enhance energy harvesting. Para
metric sweeps over the separation distance demonstrate a rich variety of c
oupling modes and system dynamics. A number of operational regimes have be
en identified for this two-flag system and correlated to the vortex dynami
cs. Simulations indicate that the coupling between flags can be used to en
hance overall energy harvesting potential.

\n
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