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The objective of this study is to propose a new method to simulate the granular flow with Cellular Automata (CA). First, it is demonstrated through the preparatory numerical experiment that Moore's neighborhood is reasonable as a basic rule to realize the effect of gravity. However, the rule in which only the effect of gravity is taken intoconsideration is not satisfactory. Then, the effect of friction between the grains and between the grain and wall is combined into the rule. Rice grains aredoi:10.2208/journalac2003.14.0_279 fatcat:ekiuafhg7rgvlfkvpphcpi6imm