Computer Simulation Study Of Several Phenomena Of Particulate Matter

Based on sandpile model self-organized critical(SOC) phenomena, separation and stratification phenomena in granular system are studied.One dimensional ricepile model is extended to two dimensional. Two models are suggested and simulated . In a same scale system the critical exponents in the two models and Manna model are same, therefore the result is that the universal in those models is independent of the changes of those rules.A renovated Manna model is studied by computer simulation. The dynamic behavior of the system is changed evidently with the density of particle number .There are a critical particle number density (PND) P c?.670 and critical exponent a =0.55 at this density. Self-organized critical phenomena occur only at certain ranges of PND.The time sequences of BTW model and Dhar model are analysised by using the standard time sequence analysis methods. The results are very different in the two models. Therefore we believe that time sequence analysis methods are legible in the classification of the sandpile models.At last, the distribution of particles of granular systems with two kinds of particles in two dimension are studied. Basing on mathematical sand particle model, we simulate the behaviors of the 24 situations of the model. The relationship between the distributions and the parameters is attained and 7 classes of sandpile are given.