Abstract
We investigate the dynamics of an intruder pulled by a constant force in a dense two-dimensional granular fluid by means of event-driven molecular dynamics simulations. In a first step, we show how a propagating momentum front develops and compactifies the system when reflected by the boundaries. To be closer to recent experiments (Candelier and Dauchot in Phys Rev 81(1):011304, 2010; Phys Rev 103(12):128001, 2009), we then add a frictional force acting on each particle, proportional to the particle’s velocity. We show how to implement frictional motion in an event-driven simulation. This allows us to carry out extensive numerical simulations aiming at the dependence of the intruder’s velocity on packing fraction and pulling force. We identify a linear relation for small and a nonlinear regime for high pulling forces and investigate the dependence of these regimes on granular temperature.
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Acknowledgements
We thank T. Aspelmeier, I. Gholami, C. Heussinger, T. Kranz and S. Ulrich for many useful discussions. We furthermore acknowledge support from the DFG by FOR 1394.
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Fiege, A., Grob, M. & Zippelius, A. Dynamics of an intruder in dense granular fluids. Granular Matter 14, 247–252 (2012). https://doi.org/10.1007/s10035-011-0309-9
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DOI: https://doi.org/10.1007/s10035-011-0309-9
Keywords
- Granular medium
- Drag force
- Event driven simulation with friction