title: Subharmonic instability of a self-organized granular jet.
abstract: Downhill flows of granular matter colliding in the lowest point of a valley, may induce a self-organized jet. By means of a quasi two-dimensional experiment where fine grained sand flows in a vertically sinusoidally agitated cylinder, we show that the emergent jet, that is, a sheet of ejecta, does not follow the frequency of agitation but reveals subharmonic response. The order of the subharmonics is a complex function of the parameters of driving.
authors.affiliation: Institute for Multiscale Simulation, Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: J E
authors.initials: JE
authors.lastname: Kollmer
authors.affiliation: Institute for Multiscale Simulation, Universität Erlangen-Nürnberg, Erlangen, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Pöschel