Images

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Falling Apart, Increasingly Chaotic

Filed under the keywords

A map of bifurcation parameters on each axis. As the bifurcation parameters are varied, the discrete dynamical system of 3-D Poor Man's Navier-Stokes Equations exhibits different regime types (i.e. subharmonic, periodic, noisy quasiperiodic, etc.) each corresponding to a certain color. From the left, the subharmonic regime breaks down as bifurcation parameters are varied, towards the right, with the black color corresponding to divergent behavior. The organized flow regime breaks down, with fractal transitions between other regimes, increasingly chaotic.

Grape

Filed under the keywords

Simulation of melting of paraffin wax in microfoam (pore size 180 microns). Volume fraction of liquid wax is shown in figure. Top surface is specified at a constant heat flux.

Green Milky Way

Filed under the keywords

This is an image taken under a Polarized Optical Microscope with crossed polarizers. A mesogenic cyanate ester resin is melted between glass slides under the microscope and after a short time turns into a nematic phase due to crosslinking and chain growth of the monomer into a thermoset. The resulting image is exhibiting a nematic Schlieren texture.

Hough Transform

Filed under the keywords

The Hough (pronounced "huff") transform is used to identify lines in digital images. Here, a black-to-white colormap portrays increasing support for lines in a digital image taken with a camera aboard a small, indoor, hovering air vehicle. Information from the camera can be combined with inertial data to produce a long-term stable estimate of vehicle attitude.

Materials Networking

Filed under the keywords

False color Scanning Electron Microscopy image taken of a high temperature thermoset open cell foam. The ligaments and struts of the foam have been coated with a shape memory polymer. The macroscopic foam works as a shape memory foam. A temporary shape can be applied that retains its structural integity up to 75C. Above 75C it relaxes back to its permanent shape and can be shaped into a different temporary form. This can be locked in by cooling back to RT.

Nano Skeleton

Filed under the keywords

False color Scanning Electron Microscopy image of a polyurethane with embedded carbon nanotubes. The foam structure of the carbon nanotube nanocomposite allows large deformations in compression. The polyurethane is a shape memory polymer and different shapes can be locked into the material. The presence of carbon nanotubes allows remote triggering of the shape recovery process from temporary to permanent shape via current or infrared light.

Red Hot Turbo Driven By Pulsed Detonations

Filed under the keywords

A Garrett GT2860R automotive turbocharger was coupled to a hydrogen-fueled pulsed detonation combustor to demonstrate the advantages of a low-entropy, pressure-gain combustion driven turbine. Research was conducted in the Air Force Research Laboratory (AFRL) Detonation Engine Research Facility. This image was taken during an 81 minute continuous run, in which the peak turbine housing temperature reached 1,014 deg F.

Stripes

Filed under the keywords

Multiple exposures of an atmospheric pressure, wire-to-plate dielectric barrier discharge (DBD) in air. DBDs may look homogeneous when viewed in real-time. However, they consist of many individual micro-discharges.

Supersonic Snoopy

This is a CFD solution of Snoopy in Mach 1.5 flow at 10,000 feet. The picture shows pressure contours and streamtraces in Snoopy's vicinity. Snoopy was created as a fun tutorial where people new to CFD could learn how to grid up a complex geometry.

What Did One Metroid Say To the Other?

Filed under the keywords

This image was created during some work with Laser Peening (LP) simulations to determine the critical distance between two LP shots. Metroids were the jellyfish-like monsters from a Nintendo video game from the 80's. The mesh from the FEA really gives it that 8-bit retro game feel. Based on their colors in the image, these two Metroids looks as though they may be ready to attack!