Small amplitude standing surface waves (movie / details)
Three node arching (movie / details)
Large amplitude standing surface waves and 0-node arching (movie / details)
Large amplitude standing surface waves and 2-node arching (movie / details)
A 2-D box is being vertically vibrated. 20 Hz and 3.3g.
A 2-D box is being vertically vibrated. 20 Hz and 4g.
A 2-D box is being vertically vibrated. 20 Hz and 5g.
A 2-D hopper is being horizontally vibrated. Left: flow with vibration, 20 Hz and 2g. Right: flow with no vibration, funnel flow. Movie
The exit of of hopper shows an oscillatory flow.
The motion of a 4.5 mm steel particle immersed in water is being tracked as it approaches, collides and rebounds on a wall. The liquid flow is visualized with laser-fluorescent micro-particles.
The motion of a 12.7 mm delrin particle immersed in water is being tracked as it approaches, collides and rebounds on a wall. The liquid flow is visualized with laser-fluorescent dye.
High speed video of a shear flow of 4mm glass particles in concentric cylinders coated with sandpaper. The upper surface is moving to the right, while the lower surface is the outer, stationary cylinder.
High speed video of the same flow but using 6mm glass beads instead.
Two-dimensional simulation of gravity-free bounded shear flow of same size particles; the upper boundary is moving to the right and the lower to the left with equal speed.
Simulation of same flow as above with a binary mixture of particles; the diameter of the large particles is twice that of the smaller particles. Large particles are shown in red for contrast.
The following movies were produced using a 2-D discrete element simulation developed at Caltech.