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Duncan Sanders

The Effects of Interstitial Fluid Friction on Thermalised Elastic Particles

Abstract: The study of granular systems usually involves investigating the effects of inelastic particle collisions; the energy dissipation caused by these collisions gives rise to a large and well known variety of strange dynamics. However, there is evidence that when an interstitial fluid is present, it is the particles' dissipative interaction with the fluid that drives the dynamics.

We have developed an event driven algorithm to investigate the behaviour of elastic particles travelling through a static viscous fluid in 1D and 2D. The the particles interact with both thermalising and reflective walls.

In one-dimension the steady state density profile is found to be strongly dependent on the initial conditions. In two-dimensions the simulation has a qualitatively similar density profile to that of an inelastic gas thermalised at one wall.