Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: POSTER: Dynamics and Diffusion
CPP 21.1: Poster
Wednesday, March 28, 2007, 16:00–18:30, Poster B
A new way of implementing partial slip boundary conditions — •Jens Smiatek1, Friederike Schmid1, and Michael Allen2 — 1Condensed matter theory, Faculty of physics, University of Bielefeld, 33615 Bielefeld, Germany — 2Department of Physics and Centre for Scientific Computing, University of Warwick, Coventry CV4 7A1, United Kingdom
Partial slip boundary conditions determine the flow profile in the micrometer scale of modern separation devices where evidence is found that the famous macroscopic no slip boundary conditions are no longer applicable.
We present a new approach to implement partial slip boundary conditions for the study of flow profiles in Dissipative particle dynamics. An extension of the Langevin equation is used to create a viscous layer that excerts friction on the fluid particles in the vicinity of the boundaries. The method is both applicable for particle-based as well as lattice-based algorithms and can be used to generate shear flows like Couette or Poiseuille flow profiles. Crucial parameter for those boundary conditions are the slip length and the position of the hydrodynamic boundaries. Combinations of the above mentioned flow profiles are used to determine both parameters exactly.
The presented method allows to tune the slip length systematically and an analytic equation for the calculation of the slip length as a function of the model parameters can be given.