Mechanisms in the size segregation of a binary granular mixture (2006)
Schröter, M., Ulrich, S., Kreft, J., Swift, J. B., Swinney, H. L.
A granular mixture of particles of two sizes that is shaken vertically will in most cases segregate. If the larger particles accumulate at the top of the sample, this is called the Brazil-nut effect...
Crucial role of sidewalls in velocity distributions in quasi-2D granular gases (2004)
Van Zon, J. S., Kreft, J., Goldman, Daniel I., Miracle, D., Swift, J. B., Swinney, Harry L.
Our experiments and three-dimensional molecular dynamics simulations of particles confined to a vertical monolayer by closely spaced frictional walls (sidewalls) yield velocity distributions with...
Steady state velocity distributions of an oscillated granular gas (2003)
Moon, Sung Joon, Swift, J. B., Swinney, Harry L.
We use a three-dimensional molecular dynamics simulation to study the single particle distribution function of a dilute granular gas driven by a vertically oscillating plate at high accelerations...
Role of friction in pattern formation in oscillated granular layers (2003)
Moon, Sung Joon, Swift, J. B., Swinney, Harry L.
Particles in granular flows are often modeled as frictionless (smooth) inelastic spheres; however, there exist no frictionless grains, just as there are no elastic grains. Our molecular dynamics...
Kink-induced transport and segregation in oscillated granular layers (2003)
Moon, Sung Joon, Goldman, Daniel I., Swift, J. B., Swinney, Harry L.
We use experiments and molecular dynamics simulations of vertically oscillated granular layers to study horizontal particle segregation induced by a kink (a boundary between domains oscillating out...
Noise, coherent fluctuations, and the onset of order in an oscillated granular fluid (2003)
Goldman, Daniel I., Swift, J. B., Swinney, Harry L.
We study fluctuations in a vertically oscillated layer of grains below the critical acceleration for the onset of ordered standing waves. As onset is approached, transient disordered waves with a...
Lattice Dynamics and Melting of a Nonequilibrium Pattern (2002)
Goldman, Daniel I., Shattuck, M. D., Moon, Sung Joon, Swift, J. B., Swinney, Harry L.
We present a new description of nonequilibrium square patterns as a harmonically coupled crystal lattice. In a vertically oscillating granular layer, different transverse normal modes of the granular...
Shocks in Vertically Oscillated Granular Layers (2002)
Bougie, J., Moon, Sung Joon, Swift, J. B., Swinney, Harry L.
We study shock formation in vertically oscillated granular layers, using both molecular dynamics simulations and numerical solutions of continuum equations to Navier-Stokes order. A flat layer of...
Phase Bubbles and Spatiotemporal Chaos in Granular Patterns (2001)
Moon, Sung Joon, Shattuck, M. D., Bizon, C., Goldman, Daniel I., Swift, J. B., Swinney, Harry L.
We use inelastic hard sphere molecular dynamics simulations and laboratory experiments to study patterns in vertically oscillated granular layers. The simulations and experiments reveal that {\em...
Velocity Distributions and Correlations in Homogeneously Heated Granular Media (2001)
Moon, Sung Joon, Shattuck, M. D., Swift, J. B.
We compare the steady state velocity distributions from our three-dimensional inelastic hard sphere molecular dynamics simulation for homogeneously heated granular media, with the predictions of a...
Suppression of dripping from a ceiling (2001)
Burgess, John M., Juel, Anne, McCormick, W.D., Swift, J.B., Swinney, Harry L.
An isothermal layer suspended from a surface is gravitationally (Rayleigh-Taylor) unstable. We find that, when a vertical temperature difference ΔT above a critical value (ΔT)c is imposed across...
Surface tension-driven convection patterns in two liquid layers (2000)
Juel, A., Burgess, J.M., McCormick, W.D., Swift, J.B., Swinney, H.L.
Two superposed liquid layers display a variety of convective phenomena that are inaccessible in the traditional system where the upper layer is a gas. We consider several pairs of immiscible liquids....
Surface tension-driven convection patterns in two liquid layers (1999)
Juel, Anne, Burgess, John M., McCormick, W. D., Swift, J. B., Swinney, Harry L.
Two superposed liquid layers display a variety of convective phenomena that are inaccessible in the traditional system where the upper layer is a gas. We consider several pairs of immiscible liquids....
Planform selection in two-layer Benard-Marangoni convection (1999)
Benard-Marangoni convection in a system of two superimposed liquids is investigated theoretically. Extending previous studies the complete hydrodynamics of both layers is treated and buoyancy is...
Velocity Correlations in Driven Two-Dimensional Granular Media (1999)
Bizon, C., Shattuck, M. D., Swift, J. B., Swinney, Harry L.
Simulations of volumetrically forced granular media in two dimensions produce s tates with nearly homogeneous density. In these states, long-range velocity correlations with a characteristic vortex...
Transport Coefficients for Granular Media from Molecular Dynamics Simulations (1999)
Bizon, C., Shattuck, M. D., Swift, J. B., Swinney, Harry L.
Under many conditions, macroscopic grains flow like a fluid; kinetic theory pred icts continuum equations of motion for this granular fluid. In order to test the theory, we perform event driven...
Continuum-type stability balloon in oscillated granular layers (1998)
De Bruyn, John R., Bizon, C., Shattuck, M. D., Goldman, D., Swift, J. B., Swinney, Harry L.
The stability of convection rolls in a fluid heated from below is limited by secondary instabilities, including the skew-varicose and crossroll instabilities. We observe a stability boundary defined...
Long-Wavelength Instability in Surface-Tension-Driven Benard Convection (1995)
Vanhook, Stephen J., Schatz, Michael F., McCormick, William D., Swift, J. B., Swinney, Harry L.
Laboratory studies reveal a deformational instability that leads to a drained region (dry spot) in an initially flat liquid layer (with a free upper surface) heated uniformly from below. This...
Onset of Surface-Tension-Driven Benard Convection (1995)
Schatz, Michael F., VanHook, Stephen J., McCormick, William D., Swift, J. B., Swinney, Harry L.
Experiments with shadowgraph visualization reveal a subcritical transition to a hexagonal convection pattern in thin liquid layers that have a free upper surface and are heated from below. The...