Europhys. Lett.
Volume 68, Number 1, October 2004
Page(s) 106 - 112
Section Interdisciplinary physics and related areas of science and technology
Published online 01 September 2004
Europhys. Lett., 68 (1), pp. 106-112 (2004)
DOI: 10.1209/epl/i2003-10310-1

Low-Reynolds-number hydrodynamics of complex fluids by multi-particle-collision dynamics

M. Ripoll, K. Mussawisade, R. G. Winkler and G. Gompper

Institut für Festkörperforschung, Forschungszentrum Jülich - 52425 Jülich, Germany

received 17 December 2003; accepted in final form 30 July 2004

Hydrodynamic interactions in complex fluids are investigated by the multi-particle-collision-dynamics algorithm, a mesoscopic simulation technique. The diffusive dynamics of simple fluids is studied, and the diffusion coefficient is calculated as a function of the mean free path of a particle. For small mean free paths, we observe strong effects due to hydrodynamic interactions among the fluid particles. These results are then used to study the dynamics of short polymer chains in solution. For an appropriate choice of the mean free path of the solvent, we obtain excellent agreement of our simulation results with the predictions of Zimm theory for the center-of-mass diffusion coefficient and the relaxation times of the Rouse modes.

82.20.Wt - Computational modeling; simulation.
83.80.Rs - Polymer solutions.
66.20.+d - Viscosity of liquids; diffusive momentum transport.

© EDP Sciences 2004