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We study numerically the stability of granular flow on a rough slope incollisional flow regime in the two-dimension. We examine the density dependenceof the flowing behavior in low density region, and demonstrate that theparticle collisions stabilize the flow above a certain density in the parameterregion where a single particle shows an accelerated behavior. Within thisparameter regime, however, the uniform flow is only metastable and is shown tobe unstable against clustering when the particle density is not high enough.Comment: 4 pages, 6 figures, submitted to J. Phys. Soc. Jpn.; Fig. 2 replaced;  references added; comments added; misprints correcte

Instability of Dilute Granular Flows on Rough Slope