| Issue |
EPL
Volume 84, Number 2, October 2008
|
|
|---|---|---|
| Article Number | 24002 | |
| Number of page(s) | 5 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/84/24002 | |
| Published online | 06 October 2008 | |
Breakdown of the fluctuation-dissipation relations in granular gases
1
Física Teórica, Universidad de Sevilla - Apartado de Correos 1065, E-41080 Sevilla, Spain, EU
2
LPTMS (CNRS UMR 8626), Université Paris-Sud - Orsay Cedex, F-91405 France, EU
3
Laboratoire de Physisque Théorique (CNRS UMR 8627), Bâtiment 210, Université Paris-Sud Orsay Cedex, F-91405 France, EU
Corresponding author: brey@us.es
Received:
13
June
2008
Accepted:
3
September
2008
A numerical molecular dynamics experiment measuring the two-time correlation function of the transversal velocity field in the homogeneous cooling state of a granular gas modeled as an ensemble of inelastic hard particles is reported. By measuring the decay rate and the amplitude of the correlations, the accuracy of the Landau-Langevin equation of fluctuating hydrodynamics is checked. The results indicate that although a Langevin approach can be valid, the fluctuation-dissipation relation must be modified, since the viscosity parameter appearing in it differs from the usual hydrodynamic shear viscosity.
PACS: 45.70.-n – Granular systems / 51.10.+y – Kinetic and transport theory of gases
© EPLA, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.