Unstable Kolmogorov flow in granular matter -- The Gallery of Nonlinear Science 19, 041106 (2009)

Unstable Kolmogorov flow in granular matter
Klaus Roeller, Jürgen Vollmer, and Stephan Herminghaus
http://link.aip.org/link/?CHAOEH/19/041106/1
By means of molecular dynamics simulation, we study the behavior of granular matter under a shear force which varies sinusoidally in space. To this end we perform simulations of 2.15×105 monodisperse, wet, three-dimensional spheres which interact via elastic hard-core collisions, and a force mimicking the effect of capillary bridges. The movie shows simulations of three different parameter regimes where the system is in an oscillatory, a stationary, and a breathing state, respectively. In all cases the wet granular matter is confined in a box with periodic boundary conditions in the two lateral directions. The system size is 100 particle diameters in width, 200 in length, and 12.5 in height and the color of each particle indicates its kinetic energy. In order to explore size effects, a simulation of a system with the same density but a 2×4-times larger box in the lateral directions is presented in the end.
Chaos 19, 041106 (2009); doi:10.1063/1.3202616
Published 27 October 2009 at http://chaos.aip.org

Category:

Science & Technology

Tags:

• chaos
• nonlinear science
• science
• physics
• granular matter
• shear force