Velocity distribution of fluidized granular gases in presence of gravity

TL;DR

This study uses Molecular Dynamics simulations to analyze the velocity distribution of a dilute granular gas under gravity, revealing complex behavior that deviates from common distribution laws and depends on multiple physical parameters.

Contribution

It provides a detailed numerical analysis showing that the velocity distribution in fluidized granular gases is non-Gaussian, non-scaling, and influenced by system-specific factors.

Findings

Velocity distribution is neither Gaussian nor stretched exponential.

Distribution shape depends on monolayers, restitution coefficient, and measurement height.

The role of particle collisions is crucial in understanding the distribution.

Abstract

The velocity distribution of a fluidized dilute granular gas in the direction perpendicular to the gravitational field is investigated by means of Molecular Dynamics simulations. The results indicate that the velocity distribution can be exactly described neither by a Gaussian nor by a stretched exponential law. Moreover, it does not exhibit any kind of scaling. In fact, the actual shape of the distribution depends on the number of monolayers at rest, on the restitution coefficient and on the height at what it is measured. The role played by the number of particle-particle collisions as compared with the number of particle-wall collisions is discussed.