234 citations · 289 across the 3 of their papers we have counts for
5 papers
Ripples and Shear Bands in Plowed Granular Media
Nick Gravish, Paul Umbanhowar, Daniel I. Goldman
Monodisperse packings of dry, air-fluidized granular media typically exist between volume fractions from = 0.585 to 0.64. We demonstrate that the dynamics of granular drag are s…
Scaling and dynamics of sphere and disk impact into granular media
Daniel I Goldman, Paul B. Umbanhowar
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 both…
MR Imaging of Reynolds Dilatancy in the Bulk of Smooth Granular Flows
Ken Sakaie, Denis Fenistein, Timothy J. Carroll +2
Dense granular matter has to expand in order to flow, a phenomenon known as dilatancy. Here we perform, by means of Magnetic Resonance Imaging, direct measurements of the evolution…
Forcing function control of Faraday wave instabilities in viscous shallow fluids
Cristian Huepe, Yu Ding, Paul Umbanhowar +1
We investigate the relationship between the linear surface wave instabilities of a shallow viscous fluid layer and the shape of the periodic, parametric-forcing function (describin…
Force Dynamics in Weakly Vibrated Granular Packings
Paul Umbanhowar, Martin van Hecke
The oscillatory force F_b^ac on the bottom of a rigid, vertically vibrated, grain filled column, reveals rich granular dynamics, even when the peak acceleration of the vibrations i…