For preliminary heuristic considerations on the motion of a granular medium as a random process, let us imagine a system of cages illustrated in Fig. 2. Each cage contains a ball subjected to the force of gravity. Let the system of cages fulfil the condition that removal of a ball from the horizontal in the second layer stratum to take its place, assuming equal probability of both events, i. e. 1/2.
KeywordsRandom Walk Parabolic Equation Hyperbolic Equation Granular Medium Asymptotic State
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