Modes of granular segregation in a revolving drum

Molecular dynamics simulation is used in studying the appearance of axial and radial segregation in a horizontal revolving drum containing a mixture of two different kinds of granular particles. As with real granular matter, the nature of the segregation is parameter dependent; for example, radial segregation can be transient or long-lasting, and axial bands can merge. Simulations displaying the different kinds of behavior are described.