Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Poster I

DY 12.17: Poster

Dienstag, 24. März 2009, 14:30–16:30, P1A

Structure Factors of a Driven Granular Gas suffering Stokes’ Drag — •Andrea Fiege¹, Timo Aspelmeier¹, and Annette Zippelius^1,2 — ¹Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — ²Institute of Theoretical Physics, University of Göttingen, Germany

We study a system of dissipative granular particles, i. e. spherical particles suffering energy loss due to inelastic collisions and Stokes’ drag. An energy source (volume bulk driving) provides a stationary state, such that the Langevin equation for a tagged particle becomes

d t

v_i = −γ_S v_i +

F_i

m_i

+ ξ_i (1)

where F_i denotes the change in the velocities due to the systematic force representing the collisions. Adding a Stokes’ drag force to a common driven granular fluid is expected to suppress the random walk of total momentum due to non-momentum-conserving driving.

We investigate the influence of momentum conservation on static structure factors using fluctuating hydrodynamics. A method to incorporate Stokes’ drag into standard event driven molecular dynamic simulations is introduced allowing us to carry out extensive numerical work and compare results to our theoretical predictions.