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The main topic of this paper (part 4) is the interpretation of data fromextended simulations published in previous Poudres & Grains (see P&G 17, #1 to#18) concerning the dynamics of N equal-size spheres in a 3d rectangular cellexcited along Oz in 0 gravity.(N=100, 500, 1000, 1200, 2000, 3000, 4000, 4500).Different Oz excitation kinds have been used (symmetric and non symmetricbi-parabolic, symmetric and non symmetric saw teeth, thermal wall). No rotationis included, dissipation is introduced via a restitution coefficient e=-V'n/Vn, where V'n and Vn are the relative ball speed along normal to ballcentres after and before collision. It is proved that the local speeddistribution along z is fundamentally dissymmetric in most part of the cellwhile the mean local speed is 0. This demonstrates the inability of a modelbased on a thermal bath (with a single local temperature) to describe thisdissipative-granular-gas-system, even when assuming that this temperaturevaries in space. The other (1-3) parts sum up few results obtained in the verylow density regime.

Microgravity and Dissipative Granular Gas in a vibrated container: a gas  with an asymmetric speed distribution in the vibration direction, but with a  null mean speed everywhere