|
A two-dimensional granular gas of inelastic, rough (frictional)
spheres subject to driving is examined. Either the translational
degrees of freedom are agitated proportional to a power of
the local particle velocity, or the rotational
degrees are agitated randomly with respect to the angular
velocity.
The steady state properties of the model, with respect to energy, partition of energy, and velocity distributions, are examined for different values of the "coloured" agitation, and compared with the homogeneous "white" driving case. A driving linearly proportional to v seems to reproduce some experimental observations which could not be reproduced by a homogeneous driving. Furthermore, we obtain that the system can be homogenized even for strong dissipation, if a driving inversely proportional to the velocity is used. In the case of rotational driving, the system is well randomized and clusters are hindered. Even though rotational driving may be difficult to realize experimentally, this is an opportunity to avoid or delay the often unwanted effect of clustering. |