Below are items from the 42nd DCASS, held 1 March 2017.
Escape the Sphere
Helmut Koch & Michael Winter
University of Kentucky
This picture was taken during an experiment with the Inertial Electrostatic Confinement Plasma Generator at the University of Kentucky. It shows an ion beam leaving the central space charge within the inner spherical electrode through its largest gap.
Hencken Burner Flame Terrain
Brian Bohan & Marc Polanka
Air Force Institue of Technology
This photo is of the flame from a Hencken Burner. An edge finding filter was applied to isolate flames and enhance the contours created by velocity variations of gases exiting the device.
Island Chains in a Sea of Chaos
John Brick & Christopher Geisel
Air Force Institute of Technology
A periapsis Poincaré map generated in the Earth-Moon circular restricted three-body problem at a value of the Jacobi Constant equal to 3.15. 1,468 spacecraft trajectories are numerically integrated for 11.9 years using a supercomputer. The island structures are associated with periapses of quasiperiodic trajectories, while the dusted sea is associated with periapses of chaotic trajectories.
Wall Temperature Contours of HIFiRE-6
Nicholas Bisek
Air Force Research Laboratory
High fidelity Large Eddy Simulations were carried out for the HIFiRE-6 flight vehicle at full vehicle-scale and Mach 6 cruise conditions. The movie shows unsteady surface temperature contours through the isolator section of the vehicle. Due to its circular cross-section, a conical shock train develops as the flow is compressed. The unsteady complex flow field predicts regions where hot gases are trapped near the isolator surface due to the conical shock boundary layer interaction.
Bag Breakup of Liquid Droplets
Prashant Khare
University of Cincinnati
The video shows the fragmentation of a water droplet that is moving in quiescent air (P = 100 atm, T = 298 K) via the bag breakup mechanism. The diameter and velocity of the droplet are 50 microns and 20 m/s, respectively. The corresponding Weber number is 33.