Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTERS Driven Soft Matter

CPP 20.34: Poster

Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A

Event-Driven Simulation of Cluster Aggregation under Periodic and Steady Shear — •Daniel Rings and Klaus Kroy — Institut für theoretische Physik, Universität Leipzig, Vor dem Hospitaltore 1, 04103 Leipzig

Aggregation of colloids has an impact on various technological as well as biological systems. Consider for example the accumulation of dust in bearings, or the clotting within blood vessels.

In the framework of our toy model we study universal features as well as distinct differences of a two-dimensional colloidal suspension under steady shear stress and periodic driving. Especially, the gelling behavior and thus macroscopic observables differ in that there appears a transition from (quasi-)stationarity to irreversible gelation. We present improvements to our collision-driven dynamics simulation, by which the investigations have been conducted. Its main features comprise a spatial coarse-graining scheme as well as approximative reduction of local event queues, which results in good algorithmic efficiency at high precision.