Harry Swinney | The University of Texas at Austin (original) (raw)

Harry Swinney

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Papers by Harry Swinney

Research paper thumbnail of Transport coefficients for granular media from molecular dynamics simulations

Research paper thumbnail of Primary instabilities and bicriticality in flow between counter-rotating cylinders

Research paper thumbnail of Reply to comment by McDougall and Barker on “Buoyancy frequency profiles and internal semidiurnal tide turning depths in the oceans”

Journal of Geophysical Research: Oceans, 2014

Research paper thumbnail of Periodic to quasiperiodic transition of chemical spiral rotation

Physica D: Nonlinear Phenomena, 1991

Research paper thumbnail of Buoyancy and electrically driven convection models in thin-layer electrodeposition

Research paper thumbnail of Emergence of order in an oscillated granular layer

Research paper thumbnail of Shock Waves in Granular Media

Shock Wave Science and Technology Reference Library, 2007

ABSTRACT Shock waves form in air when a bullet or aircraft exceeds the speed of sound. In a granu... more ABSTRACT Shock waves form in air when a bullet or aircraft exceeds the speed of sound. In a granular medium, the sound speed is small (typically 10 cm/s), so shock waves form for ordinary rather than extreme conditions. Our group has examined oblique and normal shock waves in granular flow past a wedge(E.C. Rericha et al., Phys. Rev. Lett. 88, 025403 (2002).) and in vertically oscillated granular layers, (J. Bougie et al., Phys. Rev. E 66, 051301 (2002).) using laboratory experiments, molecular dynamics simulations, and simulations of continuum equations for granular flow. The flows we consider reach Mach numbers greater than ten, a regime that is difficult to study in gas flows. We find that the shocks formed in flows of particles in a vacuum exhibit properties similar to those of shocks in supersonic gases, but there are some differences that arise because of the inelastic collisions between particles in granular media. The molecular dynamics and continuum simulations are found to describe the observations well. Increasing the restitution coefficient toward unity (decreasing the dissipation toward zero) does not lead to any qualitative change in behavior.

Research paper thumbnail of Experimental observation of sedimentation trajectories of single spheres in Hele-Shaw cells

Research paper thumbnail of Preliminary results on the granular drag force

Research paper thumbnail of Temperature Change in Melting of an Oscillated Granular Layer

... Session KH: Granular Flows IV. 5:15 PM–6:59 PM, Monday, November 20, 2006. Tampa Marriott Wat... more ... Session KH: Granular Flows IV. 5:15 PM–6:59 PM, Monday, November 20, 2006. Tampa Marriott Waterside Hotel and Marina Room: Florida Salon 6 Chair: Richard M. Lueptow, Northwestern University Abstract ID: BAPS.2006.DFD.KH.3. ...

Research paper thumbnail of Measuring the phase diagram of granular media

ABSTRACT The jamming transition in granular media has been the subject of several studies in the ... more ABSTRACT The jamming transition in granular media has been the subject of several studies in the last years. However, an experimental observation of phase diagram of granular media in three dimensions is still lacking. The goal of this study is to obtain such a diagram as a function of the shear stress, the packing fraction, phi, and the pressure in a granular bed. Shear stress is obtained by measuring the force, F, needed to pull-up a paddle immersed in a granular bed as a function of its packing fraction and the depth of immersion. We find that the value of this force is strongly depending the packing fraction: for low packing fraction (phi

Research paper thumbnail of Is random close packing of beads well defined?

Research paper thumbnail of Energy flux of internal waves generated by tidal flow over topography beneath a turning depth

Research paper thumbnail of Integrated Modeling and Analysis of Physical Oceanographic and Acoustic Processes

Research paper thumbnail of Internal wave generation by tidal flow over topography in the deep ocean

Research paper thumbnail of Spatiotemporal patterns in reaction-diffusion systems

Research paper thumbnail of Sedimenting sphere in a variable-gap Hele-Shaw cell

Research paper thumbnail of Spectral linewidth of light quasi-elastically scattered from xenon along the coexistence curve near the critical point

Research paper thumbnail of Comment on «Self-similarity of dissusion-limited aggregates and electrodeposition clusters»(and reply)

Research paper thumbnail of Bifurcation to spatially induced chaos in a reaction-diffusion system

Research paper thumbnail of Transport coefficients for granular media from molecular dynamics simulations

Research paper thumbnail of Primary instabilities and bicriticality in flow between counter-rotating cylinders

Research paper thumbnail of Reply to comment by McDougall and Barker on “Buoyancy frequency profiles and internal semidiurnal tide turning depths in the oceans”

Journal of Geophysical Research: Oceans, 2014

Research paper thumbnail of Periodic to quasiperiodic transition of chemical spiral rotation

Physica D: Nonlinear Phenomena, 1991

Research paper thumbnail of Buoyancy and electrically driven convection models in thin-layer electrodeposition

Research paper thumbnail of Emergence of order in an oscillated granular layer

Research paper thumbnail of Shock Waves in Granular Media

Shock Wave Science and Technology Reference Library, 2007

ABSTRACT Shock waves form in air when a bullet or aircraft exceeds the speed of sound. In a granu... more ABSTRACT Shock waves form in air when a bullet or aircraft exceeds the speed of sound. In a granular medium, the sound speed is small (typically 10 cm/s), so shock waves form for ordinary rather than extreme conditions. Our group has examined oblique and normal shock waves in granular flow past a wedge(E.C. Rericha et al., Phys. Rev. Lett. 88, 025403 (2002).) and in vertically oscillated granular layers, (J. Bougie et al., Phys. Rev. E 66, 051301 (2002).) using laboratory experiments, molecular dynamics simulations, and simulations of continuum equations for granular flow. The flows we consider reach Mach numbers greater than ten, a regime that is difficult to study in gas flows. We find that the shocks formed in flows of particles in a vacuum exhibit properties similar to those of shocks in supersonic gases, but there are some differences that arise because of the inelastic collisions between particles in granular media. The molecular dynamics and continuum simulations are found to describe the observations well. Increasing the restitution coefficient toward unity (decreasing the dissipation toward zero) does not lead to any qualitative change in behavior.

Research paper thumbnail of Experimental observation of sedimentation trajectories of single spheres in Hele-Shaw cells

Research paper thumbnail of Preliminary results on the granular drag force

Research paper thumbnail of Temperature Change in Melting of an Oscillated Granular Layer

... Session KH: Granular Flows IV. 5:15 PM–6:59 PM, Monday, November 20, 2006. Tampa Marriott Wat... more ... Session KH: Granular Flows IV. 5:15 PM–6:59 PM, Monday, November 20, 2006. Tampa Marriott Waterside Hotel and Marina Room: Florida Salon 6 Chair: Richard M. Lueptow, Northwestern University Abstract ID: BAPS.2006.DFD.KH.3. ...

Research paper thumbnail of Measuring the phase diagram of granular media

ABSTRACT The jamming transition in granular media has been the subject of several studies in the ... more ABSTRACT The jamming transition in granular media has been the subject of several studies in the last years. However, an experimental observation of phase diagram of granular media in three dimensions is still lacking. The goal of this study is to obtain such a diagram as a function of the shear stress, the packing fraction, phi, and the pressure in a granular bed. Shear stress is obtained by measuring the force, F, needed to pull-up a paddle immersed in a granular bed as a function of its packing fraction and the depth of immersion. We find that the value of this force is strongly depending the packing fraction: for low packing fraction (phi

Research paper thumbnail of Is random close packing of beads well defined?

Research paper thumbnail of Energy flux of internal waves generated by tidal flow over topography beneath a turning depth

Research paper thumbnail of Integrated Modeling and Analysis of Physical Oceanographic and Acoustic Processes

Research paper thumbnail of Internal wave generation by tidal flow over topography in the deep ocean

Research paper thumbnail of Spatiotemporal patterns in reaction-diffusion systems

Research paper thumbnail of Sedimenting sphere in a variable-gap Hele-Shaw cell

Research paper thumbnail of Spectral linewidth of light quasi-elastically scattered from xenon along the coexistence curve near the critical point

Research paper thumbnail of Comment on «Self-similarity of dissusion-limited aggregates and electrodeposition clusters»(and reply)

Research paper thumbnail of Bifurcation to spatially induced chaos in a reaction-diffusion system

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