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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTERS Driven Soft Matter

CPP 20.13: Poster

Wednesday, February 27, 2008, 16:00–18:30, Poster A

Hard spheres under shear — •Erik Lange¹, Cristiano de Michele², Francesco Sciortino², and Matthias Fuchs¹ — ¹University of Konstanz — ²Universita di Roma La Sapienza

Hard spheres are an important model system in equilibrium as well as in non-equilibrium statistical mechanics.

Adding Brownian motion, hard sphere systems serve as model for colloidal dispersions. Yet, the simulation of hard spheres with Brownian dynamics is difficult because of the singular nature of the interaction potential.

We develop an event-driven approach to simulate Brownian motion of (truly) hard spheres at high densities and present results for strongly sheared systems.

In particular we want to focus on the stress tensor:

This can be used to calculate not only the stress-stress correlation functions but also the viscosities, and non-linear flow curves.

These quantities can be measured directly in a sheared colloidal suspensions.

We present results from simulations of a system with a simple linear shear profile not including hydrodynamic interactions.