Session Z13: Granular Materials II

11:15 AM–2:15 PM, Friday, March 25, 2011
Room: D225/226

Sponsoring Units: GSNP DFD
Chair: Arshad Kudrolli, Clark University

Abstract ID: BAPS.2011.MAR.Z13.3

Abstract: Z13.00003 : Simulations of granular jet impact deadzone formation

11:39 AM–11:51 AM

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  Nicholas Guttenberg
    (University of Chicago)

  Jake Ellowitz
    (University of Chicago)

  Wendy Zhang
    (University of Chicago)

  Herve Turlier
    (Univ. Pierre \& Marie Curie)

  Sidney Nagel
    (University of Chicago)

Motivated by granular experiments showing the emergence of continuum-like dynamics when a dense jet hits a target, we simulate the impact of 2D and 3D granular jets of frictional, cohesion-less grains upon a fixed target. This is a inertial, dense jet regime where the motion is essentially incompressible. Impact deflects the material in the jet into a hollow conical sheet. The cone angles measured in simulation are consistent with previous experimental studies of the 3D granular jet impact. In addition, experiments have revealed the formation of a ``dead zone,'' a region where the grain motion is negligibly small. The simulation shows that this dead zone can only form when a no-slip boundary condition is enforced at the target. The presence or absence of the dead zone leads to a change in cone angle consistent with the experimentally observed differences in cone angle between the 3D granular flow and the corresponding water bell flow.

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