Final Presentation

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24 Οκτ 2013 (πριν από 3 χρόνια και 9 μήνες)

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International Ice
P
atrol map showing
know iceberg positions,

Data collected through observation flights



The rate of iceberg deterioration is
important to those modeling iceberg
drift and associated threats posed to
commercial fishing, transport, and
resource development industries in
iceberg
-
prone waters
.




Iceberg deterioration rates are
difficult to predict due to the natural
complexity of the ocean environment
and iceberg characteristics.



The scarcity of full scale data and
the cost of obtaining it prevent
solving the dilemma at the full scale,
thus analytical, theoretical and
numerical solutions are sought

Iceberg Decay Factors

Thermodynamic Process


Solar radiation


Forced Convection


Buoyant convection


Wave erosion


Mechanical Process


Cracking and Calving

Iceberg

Collapse in
Battle Harbour NL

A good question is:


“How many of these factors can be accurately modeled using computer flow analysis”

To create standard simple series of ice melt experiments and data sets that can
be used to aid in the verification and calibration of
Computational Fluid Dynamics
and Thermodynamics

models to simulate iceberg melting.

Goal Of Work Term

Rough representation of flow around an iceberg

Preliminary Set up experiments


The making of consistent ice easily


The proper characteristics of dye



A method for dye injection and
image capture


Ice Experiments


Ice Sheet experiments


Dyed ice block experiments


Mass Flux Experiments

Dye / Visualization


Dye Has to be same density
and temperature as the flow you
are trying to track


Dye has to be low viscosity and
have no visible particles


Dye frozen in to pockets in the
ice can work effectively


Sharp white background on all
sides of the tank not in use
increases visibility


Tank set up


Fast dissolve water softener salt
works well for adjustment of
Water density


High temperature lights need to
avoided


In free floating ice test’s the ice
top surface area has to be less
the 4 % of the tank free surface


Accurate

salinity and
temperature probe needed for
all tests


A 10 cm thick wall of ice was placed vertically on one side of the
tank and flow was documented

Ice Wall Testing


there was a noticeable
notch at the top of the
submerged portion of the
ice


There was a great deal of
small bubble release


There was grater ice decay
in the top portion of the ice


There was separation of a
downward flow of water on
the ice face and the rest of
the water in the tank

A 10 cm cube of ice was frozen with dye
impregnated the melt flow was then recorded

Free Floating Dyed Ice Block

Shape After
Melt


60 % of melt floated
constantly to the surface


40% Fell in a loose haze
to the bottom


Surface water was low
salinity


Water near the bottom of
the tank had a reduction
in salinity


Strong rotation and
vortex created

Shape Before
Melt

Four equal 5 cm cubes of ice were submerged in saline water
and the mass was recorded every 4 min

Mass Flux Cube testing


Due to the necessity of
weighing melt rate will be
affected due to in water
disruption


Results were uniform and a
reasonable, therefore a mass
flux rate could be predicated
for the given shape


Flow 3D does have the ability to compute
melting


Problems with


What

was learned


This work would be suited to a person with advanced
computer modeling experience.


Choose which of the previous tests will be most
useful in the calibration of computer models of ice
in saline water


Execute these tests with greater accuracy and
consistency


Record a data set and flow patterns in a way that
can be used to validate flow analysis software


Record a method for recreating these experiment
with modifications to suit many applications