Phys. Rev. E 51, 1745–1756 (1995)Density waves and 1/f density fluctuations in granular flowReceived 29 August 1994; published in the issue dated March 1995 We simulate granular flow in a narrow pipe with a lattice-gas automaton model. We find that the density in the system is characterized by two features. One is that spontaneous density waves propagate through the system with well-defined shapes and velocities. The other is that density waves are distributed so as to make the power spectra of density fluctuations vary as 1/fα noise. Three important parameters make these features observable; they are energy dissipation, average density, and the roughness of the pipe walls. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.51.1745
DOI:
10.1103/PhysRevE.51.1745
PACS:
05.20.Dd, 47.50.+d, 47.20.-k, 46.10.+z
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