Abstract
The stationary state eventually reached by a vibrated granular gas with a piston on the top, and in presence of gravity, is considered. The relationship between the second velocity moments of the piston and of the gas just below it is investigated by using event driven molecular dynamics simulations. It is concluded that velocity correlations between the piston and the gas play a crucial role in determining the velocity fluctuations of the piston, that can be much larger than estimated by energy equipartition.
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Brey, J.J., Ruiz-Montero, M.J. Velocity correlations between a vibrated granular gas and a piston on top. Granular Matter 14, 127–131 (2012). https://doi.org/10.1007/s10035-011-0289-9
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DOI: https://doi.org/10.1007/s10035-011-0289-9