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DY: Dynamik und Statistische Physik

DY 44: Granular Systems

DY 44.4: Talk

Thursday, March 11, 2004, 15:30–15:45, H2

Sound propagation in dense granular media — •Stefan Luding — Particle Technology, DCT, TUDelft, Julianalaan 136, 2628 BL Delft, Netherlands

The goal of the presented research is to understand information propagation in dense assemblies of spherical, polydisperse granular media. Using a discrete element method (DEM) simulation, the wave propagation is studied. After relaxation to an isotropic static equilibrium state, a wave is agitated by moving one side wall. First, the effect of the contact force-law is examined for a cubic sample; second, the effects of singular and periodic agitations are studied with Fourier analysis; third, pressure effects and an-isotropy are examined.