Dynamics of an intruder in dense granular fluids

Fiege, Andrea; Grob, Matthias; Zippelius, Annette

doi:10.1007/s10035-011-0309-9

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Dynamics of an intruder in dense granular fluids

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Zippelius, Annette
Fellow Group Polymers, complex fluids and disordered systems, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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引用

Fiege, A., Grob, M., & Zippelius, A. (n.d.). Dynamics of an intruder in dense granular fluids. Granular Matter, 14(2), 247-252. doi:10.1007/s10035-011-0309-9.

引用: https://hdl.handle.net/11858/00-001M-0000-0029-17EC-5

要旨

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.