Archive page for the 46th DCASS
Below are items from the 46th DCASS, held 2 March 2021.
Note, this was held as a virtual event due to the global pandemic.
Documents in PDF format
Call for Abstracts (62 KB)
Art in Science Flier (240 KB)
Guid on recording a video presentation (914 KB)
Final Program (1.2 MB)
Click here to watch the Keynote Presentation
Best Presentation Winners
- Nathan Boone (Space)
- Nicholas Degroote (Unmanned Aerial Systems)
- Conor Faulhaber (Material Science)
- Nathan Fiorino (Combustion)
- Matthew Fuqua (Heat Transfer)
- Patrick Hammer (Flight Vehicles)
- Jashwanth Rao Venepally (Aerospace Enabling Technologies)
Art-in-Science Competition Winners
(Click on the image to view the original submitted file.)
1st Place Image
Riding the Silica Wave
Michael Wilkinson and Marina B. Ruggles-Wrenn
Air Force Institute of Technology
Borosilicate glassy layer on top of hafnium oxide scale, both of which
are produced on the surface of hafnium diboride with 20 percent silicon
carbide by volume after heated to 1600 degrees Celsius in air.
2nd Place Image
Interface Shape Between Liquid Drop and Layer
Murat Dinc
Miami University
It is very significant to differentiate liquid drop and liquid layer
in single drop and spray cooling research areas to better understand
the effects of liquid drop and layer on the results. One of the best
way to do is using computer simulations to analyze liquid drop and
liquid layer separately by assigning separate phases and colors for
each. This image obtained from a 2D axisymmetric multiphase simulation
of a single liquid drop impacting on a liquid layer. In this simulation,
blue color represents liquid drop, green represents liquid layer, and
red represents air phases. The shape of liquid drop at the simulation
time shown in top image resembles moon jellyfish (blue liquid drop)
whereas the shape of interface between the liquid drop and layer changes
with simulation time and eventually liquid drop resembles octopus
like shape with liquid crown sheet and waves that looks like octopus
legs (bottom image).
3rd Place Image
Ceramics at the Center of the Sun
David Swanson and Marina B. Ruggles-Wrenn
Air Force Institute of Technology
A close-up view of a small oxide ceramic specimen as it undergoes
a scorching heat treatment at 1500 degrees Celsius in a ceramic tube furnace.
1st Place Video
Detonation Chamber Rapid Unplanned Disassembly
Daniel Cuppoletti
University of Cincinnati
An optically accessible detonation chamber undergoes rapid unplanned
disassembly while investigating the physical mechanisms responsible
for detonation amplification. A decelerating detonation wave travels
from left to right and as it reflects from a wall it reinitializes
the detonation which propagates back from the right in an amplified
state, as indicated by the strong emission. The unsteady reinitialization
of the detonation wave generates 2-3 times the pressure and temperature
of a steady detonation, resulting in 1,500-2,000 psi for a few
microseconds. This initiates a crack in the polycarbonate windows
that propagates back across the test section and the window separates
approximately 1 inch and comes back together, avoiding complete
destruction from the bolts in the upper window hitting the rods
holding the test section together and imprinting the thread pattern
into the structure. Fortunately, we had more windows and now we
have some fun desk hardware. Schlieren video captured at 175,000
fps, playback at 20 fps, over a 12 ms time period, false color applied.
2nd Place Video
Motion of Debris Following a Catastrophic Spacecraft
Mishap During an Earth-Moon Transfer
Nathan Boone and Robert Bettinger
Air Force Institute of Technology
This animation shows the motion of debris following a catastrophic
spacecraft mishap during an Earth-Moon transfer much like the
transfer used by the Apollo 13 mission. In this video, the green
circle represents the Earth, the black circle represents the Moon,
the red crosses represent the Earth-Moon Lagrange points, and the yellow
line extends toward the Sun. The black dots represent debris particles
generated in the spacecraft explosion. Debris enters an orbit with a
perigee within the geostationary belt and an apogee well beyond the
Moon, possibly suggesting threats to operational spacecraft near Earth
if a debris-generating spacecraft mishap similar to the Apollo 13 event
occurred today. Also interesting in this animation is the cardioid-like
shape that forms at the apogee of the debris cloud, possibly reflecting
the gravitational influence of the Moon.
