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We study a 1-D granular gas of point-like particles not subject to gravitybetween two walls at temperatures T_left and T_right. The system exhibits twodistinct regimes, depending on the normalized temperature difference Delta =(T_right - T_left)/(T_right + T_left): one completely fluidized and one inwhich a cluster coexists with the fluidized gas. When Delta is above a certainthreshold, cluster formation is fully inhibited, obtaining a completelyfluidized state. The mechanism that produces these two phases is explained. Inthe fluidized state the velocity distribution function exhibits peculiarnon-Gaussian features. For this state, comparison between integration of theBoltzmann equation using the direct-simulation Monte Carlo method and resultsstemming from microscopic Newtonian molecular dynamics gives good coincidence,establishing that the non-Gaussian features observed do not arise from theonset of correlations.

Clustering and fluidization in a one-dimensional granular system: Molecular dynamics and direct-simulation Monte Carlo method