List of Figures

View Image Figure 1:
Artistic impression of cascading sound cones (in the geometrical acoustics limit) forming an acoustic black hole when supersonic flow tips the sound cones past the vertical.
View Image Figure 2:
Artistic impression of trapped waves (in the physical acoustics limit) forming an acoustic black hole when supersonic flow forces the waves to move downstream.
View Image Figure 3:
A moving fluid will drag sound pulses along with it.
View Image Figure 4:
A moving fluid will tip the “sound cones” as it moves. Supersonic flow will tip the sound cones past the vertical.
View Image Figure 5:
A moving fluid can form “trapped surfaces” when supersonic flow tips the sound cones past the vertical.
View Image Figure 6:
A collapsing vortex geometry (draining bathtub): The green spirals denote streamlines of the fluid flow. The outer circle represents the ergo-surface while the inner circle represents the [outer] event horizon.
View Image Figure 7:
Gravity waves in a shallow fluid basin with a background horizontal flow.
View Image Figure 8:
Domain wall configuration in 3He.
View Image Figure 9:
Ripplons in the interface between two sliding superfluids.
View Image Figure 10:
Velocity profile for a left going flow; the profile is dynamically modified with time so that it reaches the profile with a sonic point at the asymptotic future.
View Image Figure 11:
One-dimensional velocity profile with a black hole horizon and a white hole horizon.
View Image Figure 12:
One-dimensional velocity profile in a ring; the fluid flow exhibits two sonic horizons, one of black hole type and the other of white hole type.