Lattice Boltzmann simulations of soft-matter systems<br/><br/><br/><br/>

Tuesday, November 4, 2008 - 11:15am - 12:00pm
EE/CS 3-180
Burkhard Dünweg (Max-Planck Institut für Polymerforschung)
A brief introduction into the lattice Boltzmann method is given. For
soft-matter applications, it is necessary to include thermal
fluctuations by introducing stochastic collision rules. This can be
done consistently based upon the concept of detailed balance.
Brownian particles are coupled to the lattice Boltzmann solvent
via a Stokes friction and interpolation. The Langevin equations
of the overall system satisfy both momentum conservation and
the fluctuation-dissipation theorem. The long-time mobility of the
particles differs from the input Stokes value by a contribution
from the surrounding flow. The usefulness of this method is
demonstrated by examples from polymer physics (hydrodynamic
screening of semidilute polymer solutions) and colloid physics
(electrophoresis of charge-stabilized colloidal dispersions).

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