Regensburg 2010 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 13: Granular Matter/ Contact Dynamics II

DY 13.7: Talk

Wednesday, March 24, 2010, 11:15–11:30, H47

Structure Factors of Driven Granular Fluids underlying Stokes Drag — •Andrea Fiege^1,2, Timo Aspelmeier^1,2, and Annette Zippelius^1,2 — ¹Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — ²Institute for Theoretical Physics, University of Göttingen, Germany

We study a monodisperse system of hard spheres which is subject to two dissipative mechanisms, the inelasticity of collisions and the loss of energy due to a drag force caused by a surrounding fluid, such that the Langevin equation of the system becomes d/d t v_i = −γ_S v_i + F_i/m_i + ξ_i, where F_i denotes the systematic force on the particle due to collisions and the energy source ξ_i provides a stationary state by adding random momentum to each particle. The drag force suppresses the random walk of the center of mass of the system caused by the random kicks. We introduce an event-driven algorithm that is capable of including a drag force and investigate the structure factors of the system.