▪ Abstract The recent avalanche of research activity in the field of granular matter has yielded
much progress. The use of state-of-the-art (and other) computational and experimental …

This review presents recent technological advances in charge-coupled-device ultrahigh-
speed video cameras and their applications in experimental fluid mechanics. Following a …

We present the results of a combined experimental and theoretical investigation of the
normal impact of hydrophobic spheres on a water surface. Particular attention is given to …

Experiments on the low-speed impact of solid objects into granular media have been used
both to mimic geophysical events,,,, and to probe the unusual nature of the granular state of …

We study the collapse of a transient cavity of air in water created by the impact of a solid
body. Experimentally, we characterize the dynamics of the cavity from its creation (t= 0) until …

We report on craters formed by balls dropped into dry, noncohesive, granular media. By
explicit variation of ball density ρ b, diameter D b, and drop height H, the crater diameter is …

Direct measurements of the acceleration of spheres and disks impacting granular media
reveal simple power law scalings along with complex dynamics which bear the signatures of …

We present the results of experiments on impact craters formed by dropping a steel ball
vertically into a container of small glass beads. As the energy of impact increases, we …

Our experiments and molecular dynamics simulations on a projectile penetrating a two-
dimensional granular medium reveal that the mean deceleration of the projectile is constant …

Very fine sand is prepared in a well-defined and fully decompactified state by letting gas
bubble through it. After turning off the gas stream, a steel ball is dropped on the sand. On …