Theses videos show the collapse of fixed width granular column:
- on the first, aspect ratio a=7, without fluid
- on the second, aspect ratio a=7, with water.
Grains diameter = 10-3 m, grains density = 2.6. The viscous fluid has a 1000 higher viscosity than water.
The color levels indicate the particles and fluid velocities (red for the higher velocities, blue for the lowest ones).
Granular column collapse. Aspect ratio a=7, without fluid. © IRSN
Granular column collapse. Aspect ratio a=7, with water. © IRSN