1.062/12.207/18.354/18.3541 Nonlinr Dynamics:Continuum Sys
Spring 2016
Instructor: Lydia Bourouiba
TA: Yongji Wang
Lecture: MW3.30-5 (5-233)
Announcements
Online Evaluations Due 9 am Monday Morning - your input is important
Dear all:
Thank you for a great class participation this term. If you have not had a chance yet to fill out the course evaluation, please do so tonight. The deadline is 9 am tomorrow morning.
You can access the site here.
Your feedback is critically needed and important for shaping the future of this class.
All the best for your final week and future endeavors.
Best,
LB
Thank you for a great class participation this term. If you have not had a chance yet to fill out the course evaluation, please do so tonight. The deadline is 9 am tomorrow morning.
You can access the site here.
Your feedback is critically needed and important for shaping the future of this class.
All the best for your final week and future endeavors.
Best,
LB
Announced on 15 May 2016 10:07 p.m. by Lydia Bourouiba
Feedback Forms and Guidelines for Talks
Dear all:
I received a number of questions about the talks. Here is the feedback form that you will all have to fill during the talk of your peers that gives the idea of what is expected:
Please email me if you have further questions.
Best,
LB
I received a number of questions about the talks. Here is the feedback form that you will all have to fill during the talk of your peers that gives the idea of what is expected:
Please email me if you have further questions.
Best,
LB
Announced on 08 May 2016 5:04 a.m. by Lydia Bourouiba
Presentation Schedule
Dear all:
The presentaiton schedule for next week will be:
Monday:
Neo and Alex
Tyler
Julia
Wednesday:
Elizabeth and Megan
James
Andreas and Hao
Please plan for 25-30 min of talk and demos/illustrations.
Best,
LB
The presentaiton schedule for next week will be:
Monday:
Neo and Alex
Tyler
Julia
Wednesday:
Elizabeth and Megan
James
Andreas and Hao
Please plan for 25-30 min of talk and demos/illustrations.
Best,
LB
Announced on 08 May 2016 1:10 a.m. by Lydia Bourouiba
Project research progress report for peer-review (May 5th midnight)
Dear class:
The research progress report will be due next Thursday (May 5th) midnight.
The goal of this report is to prepare the final report of the class and to explain progress since the last progress report and list what you plan to add before the final submission at the end of the term.
The second goal of this report is to get feedback from your peers who will be reviewing the repot (anonymous review) similarly to what you would be doing during a scientific publication in peer-reviewed journals. Guidelines will be provided for the reviewer to prepare constructive comments and feedback and ask questions about methodology, goals, and results.
You can then use the feedback of your peers to continue improve the final report and also write a short rebuttal that I will comment on.
All the best,
LB
The research progress report will be due next Thursday (May 5th) midnight.
The goal of this report is to prepare the final report of the class and to explain progress since the last progress report and list what you plan to add before the final submission at the end of the term.
The second goal of this report is to get feedback from your peers who will be reviewing the repot (anonymous review) similarly to what you would be doing during a scientific publication in peer-reviewed journals. Guidelines will be provided for the reviewer to prepare constructive comments and feedback and ask questions about methodology, goals, and results.
You can then use the feedback of your peers to continue improve the final report and also write a short rebuttal that I will comment on.
All the best,
LB
Announced on 28 April 2016 2:14 p.m. by Lydia Bourouiba
Thesis defense on fluid dynamics and vegetation
Dear class:
I want to pass on this announcement as it might be of interest to students that are keen to learn more about fluid mechnaics and its use in more applied settings such as flow through vegetation.
This defense is open to all so you can attend.
LB
I want to pass on this announcement as it might be of interest to students that are keen to learn more about fluid mechnaics and its use in more applied settings such as flow through vegetation.
This defense is open to all so you can attend.
LB
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The defense is scheduled for Friday, April 29 at 12 pm in ROOM TBC.
The defense is scheduled for Friday, April 29 at 12 pm in ROOM TBC.
Title: Feedbacks Between Plants, Flow,
and Particle Fate
Abstract:
Environmental flows carry a wide variety of
particles that interact with vegetation. Vegetated canopies are
anchored by sediment, release pollen and seeds to colonize new
ground, rely on nutrients carried by sediment, and may be killed by
disease spores. While the influence of vegetation on flow profiles
has been investigated, the transport of particles within vegetated
canopies remains poorly understood. In this thesis I present the
results from laboratory experiments and numerical modeling which
investigated particle fate and transport around emergent and
submerged model vegetation canopies.
The effect of canopy mediated flow on
particle transport was explored in experimental studies using model
vegetation. First, the flow diversion and extended wake region due
to a circular patch of model reedy emergent vegetation resulted in
regions of scour on the patch side and deposition in the patch
wake, which are related to a non-dimensional flow blockage
parameter. In-patch scour increased with turbulent kinetic energy
levels, which were positively correlated to stem density. Second,
within a long, submerged canopy, the capture of particles was
reduced near the leading edge due to the presence of a vertical
updraft. In the fully developed region, particle capture was
increased for releases below the penetration of canopy scale
vortices, and for particles with increased settling velocity.
The impact of canopy flexibility on
turbulence within the canopy was explored using a submerged canopy
of model flexible vegetation. The drag reduction due to
reconfiguration was described through a drag coefficient that
decreased as a power-law function of velocity, with a negative
exponent (Vogel number). Velocity measurements made within and
above the canopy demonstrate that unsteady reconfiguration,
responding to individual turbulent events, preferentially allows
stronger sweeps to penetrate the canopy, enhancing the
skewness.
Next, spore escape was investigated across a
range of canopy densities and particle settling velocities using a
random displacement model (RDM) parameterized with an eddy
diffusivity based on a simple set of physical parameters. This work
filled a gap between field observations and traditional Lagrangian
stochastic modeling, improving predictions of fungal spore escape
to drive long range transport models. The effect of canopy and
particle characteristics on the genotypic diversity of Zostera
marina canopies was explored, pointing to the physical mechanisms
governing successful pollination.
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Announced on 21 April 2016 2:55 p.m. by Lydia Bourouiba
