The impact of an object on a granular solid is an ubiquitous phenomenon in nature, the
scale of which ranges from the impact of a raindrop onto sand all the way to that of a large …

Animals moving on and in fluids and solids move their bodies in diverse ways to generate
propulsion and lift forces. In fluids, animals can wiggle, stroke, paddle or slap, whereas on …

Resistive force theory (RFT) is often used to analyze the movement of microscopic
organisms swimming in fluids. In RFT, a body is partitioned into infinitesimal segments, each …

We measure the quasistatic friction force acting on intruders moving downwards into a
granular medium. By utilizing different intruder geometries, we demonstrate that the force …

Impact dynamics is measured for spherical and cylindrical projectiles of many different
densities dropped onto a variety non-cohesive granular media. The results are analyzed in …

The paper presents an experimental and numerical study of the forces experienced by a
cylinder moving horizontally in a granular medium under gravity. Despite the symmetry of …

While the penetration of objects into granular media is well‐studied, there is little
understanding of how objects settle in gravities, geff, different from that of Earth—a scenario …

While terrestrial locomotors often contend with permanently deformable substrates like sand,
soil, and mud, principles of motion on such materials are lacking. We study the desert …

The drag force experienced by a horizontal cylinder rotating around the vertical axis in a
granular medium under gravity is experimentally investigated. We show that, for deeply …

We study the resistance force of cylindrical objects penetrating quasi-statically into granular
media experimentally and numerically. Simulations are validated against experiments. In …