Europhys. Lett.
Volume 75, Number 1, July 2006
Page(s) 56 - 62
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 31 May 2006
Europhys. Lett., 75 (1), pp. 56-62 (2006)
DOI: 10.1209/epl/i2006-10071-3

Velocity distributions in a freely evolving granular gas

Syed Rashid Ahmad and Sanjay Puri

School of Physical Sciences, Jawaharlal Nehru University - New Delhi, 110067, India

received 16 February 2006; accepted in final form 9 May 2006
published online 31 May 2006

We study freely evolving inelastic granular gases via molecular dynamics simulations in d=2,3 dimensions. This system initially loses energy or cools in a homogeneous cooling state (HCS). However, the granular gas is unstable to fluctuations in the velocity and density fields, and its asymptotic state is an inhomogeneous cooling state (ICS). We discuss the nature of velocity distributions in both the HCS and the ICS.

45.70.-n - Granular systems.
45.70.Mg - Granular flows: mixing, segregation and stratification.

© EDP Sciences 2006