Driven Granular Fluids: Collective Effects


An external driving force is needed to keep an assembly of granular particles in a fluidized state. With the combination of dissipation and driving, a granular fluid is necessarily far from thermal equilibrium. I will show that the flow behavior of randomly driven inelastic hard spheres is remarkably similar to that of elastic hard spheres, yet, there are also fundamental differences. The influence of momentum conservation will play a central role. I will discuss both static and dynamic correlation functions from an analytical as well as simulation point of view. Topic include long-time tails, long-range correlations and the glass transition.

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