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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Authors:

  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.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.Z13.3