Competitive Clustering in a Granular Gas

2003 ◽  
Vol 15 (9) ◽  
pp. S8-S8 ◽  
Author(s):  
René Mikkelsen ◽  
Ko van der Weele ◽  
Devaraj van der Meer ◽  
Michel Versluis ◽  
Detlef Lohse
Keyword(s):  
Granular Gas

scholarly journals Un-jamming due to energetic instability: statics to dynamics

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Stefan Luding ◽  
Yimin Jiang ◽  
Mario Liu
Keyword(s):  
Granular Matter ◽  
Numerical Data ◽  
Soft Materials ◽  
Material Point ◽  
Solid States ◽  
Granular Gas ◽  
Granular Solid Hydrodynamics ◽  
Particle Simulations ◽  
Points Of View ◽  
Deformation Modes

Abstract Jamming/un-jamming, the transition between solid- and fluid-like behavior in granular matter, is an ubiquitous phenomenon in need of a sound understanding. As argued here, in addition to the usual un-jamming by vanishing pressure due to a decrease of density, there is also yield (plastic rearrangements and un-jamming that occur) if, e.g., for given pressure, the shear stress becomes too large. Similar to the van der Waals transition between vapor and water, or the critical current in superconductors, we believe that one mechanism causing yield is by the loss of the energy’s convexity (causing irreversible re-arrangements of the micro-structure, either locally or globally). We focus on this mechanism in the context of granular solid hydrodynamics (GSH), generalized for very soft materials, i.e., large elastic deformations, employing it in an over-simplified (bottom-up) fashion by setting as many parameters as possible to constant. Also, we complemented/completed GSH by using various insights/observations from particle simulations and calibrating some of the theoretical parameters—both continuum and particle points of view are reviewed in the context of the research developments during the last few years. Any other energy-based elastic-plastic theory that is properly calibrated (top-down), by experimental or numerical data, would describe granular solids. But only if it would cover granular gas, fluid, and solid states simultaneously (as GSH does) could it follow the system transitions and evolution through all states into un-jammed, possibly dynamic/collisional states—and back to elastically stable ones. We show how the un-jamming dynamics starts off, unfolds, develops, and ends. We follow the system through various deformation modes: transitions, yielding, un-jamming and jamming, both analytically and numerically and bring together the material point continuum model with particle simulations, quantitatively. Graphic abstract

scholarly journals Particle Dynamics at the Onset of the Granular Gas-Liquid Transition

2021 ◽  
Vol 126 (12) ◽  
Author(s):  
M. Noirhomme ◽  
A. Cazaubiel ◽  
E. Falcon ◽  
D. Fischer ◽  
Y. Garrabos ◽  
...  
Keyword(s):  
Particle Dynamics ◽  
Granular Gas ◽  
Liquid Transition

scholarly journals Granular fountains: Convection cascade in a compartmentalized granular gas

2006 ◽  
Vol 73 (6) ◽  
Author(s):  
Devaraj van der Meer ◽  
Ko van der Weele ◽  
Peter Reimann
Keyword(s):  
Granular Gas

scholarly journals Steady uniform shear flow in a low density granular gas

1997 ◽  
Vol 55 (3) ◽  
pp. 2846-2856 ◽  
Author(s):  
J. J. Brey ◽  
M. J. Ruiz-Montero ◽  
F. Moreno
Keyword(s):  
Shear Flow ◽  
Low Density ◽  
Uniform Shear ◽  
Uniform Shear Flow ◽  
Granular Gas

scholarly journals Heat flux in a granular gas

2012 ◽  
Author(s):  
J. J. Brey ◽  
M. J. Ruiz-Montero
Keyword(s):  
Heat Flux ◽  
Granular Gas

scholarly journals New patterns in high-speed granular flows

2015 ◽  
Vol 769 ◽  
pp. 218-228 ◽  
Author(s):  
Nicolas Brodu ◽  
Renaud Delannay ◽  
Alexandre Valance ◽  
Patrick Richard
Keyword(s):  
High Speed ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Scaling Law ◽  
Three Dimensional ◽  
Secondary Flows ◽  
Particle Volume ◽  
Rheological Models ◽  
Granular Gas ◽  
Internal Structures

We report on new patterns in high-speed flows of granular materials obtained by means of extensive numerical simulations. These patterns emerge from the destabilization of unidirectional flows upon increase of mass holdup and inclination angle, and are characterized by complex internal structures, including secondary flows, heterogeneous particle volume fraction, symmetry breaking and dynamically maintained order. In particular, we evidenced steady and fully developed ‘supported’ flows, which consist of a dense core surrounded by a highly energetic granular gas. Interestingly, despite their overall diversity, these regimes are shown to obey a scaling law for the mass flow rate as a function of the mass holdup. This unique set of three-dimensional flow regimes raises new challenges for extending the scope of current granular rheological models.

On cyclic oscillation in granular gas

2005 ◽  
Vol 50 (8) ◽  
pp. 726-730 ◽  
Author(s):  
Tiande Miao ◽  
Yuan Liu ◽  
Fuxing Miao ◽  
Qingsong Mu
Keyword(s):  
Granular Gas ◽  
Cyclic Oscillation

Asymmetric local velocity distribution in a driven granular gas

2015 ◽  
Vol 32 (4) ◽  
pp. 1066-1079 ◽  
Author(s):  
Yanpei Chen ◽  
Pierre Evesque ◽  
Meiying Hou
Keyword(s):  
Velocity Distribution ◽  
Local Velocity ◽  
Granular Gas
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