Energy decay in a granular gas collapse. (6th January 2017)

• Record Type: Journal Article
• Authors: Almazán, Lidia; Serero, Dan; Salueña, Clara; Pöschel, Thorsten
• Is Part Of: New journal of physics. Volume 19:Number 1(2017:Jan.)
• Publication Date: 2017-01-06
• Subjects: granular gas -- granular matter -- granular collapse -- dissipative collisions; 00.00 -- 20.00 -- 42.10; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/aa5598
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: An inelastic hard ball bouncing repeatedly off the ground comes to rest in finite time by performing an infinite number of collisions. Similarly, a granular gas under the influence of external gravity, condenses at the bottom of the confinement due to inelastic collisions. By means of hydrodynamical simulations, we find that the condensation process of a granular gas reveals a similar dynamics as the bouncing ball. Our result is in agreement with both experiments and particle simulations, but disagrees with earlier simplified hydrodynamical description. Analyzing the result in detail, we find that the adequate modeling of pressure plays a key role in continuum modeling of granular matter.