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DY: Fachverband Dynamik und Statistische Physik

DY 20: Soft Particles in Flows III (Focus session, joint DY/CPP)

DY 20.1: Hauptvortrag

Dienstag, 21. März 2017, 14:00–14:30, ZEU 160

Particle based simulations of viscoelastic Soft Matter — •Wim Briels — University of Twente, Enschede, The Netherlands

In order to describe flow of soft matter in complex geometries detailed information is needed about how stresses depend on velocity gradients and concentration. Besides this, often compressible flow equations must be solved concomitantly with diffusion equations.

Since it is difficult to collect the appropriate information and to accurately represent it with a constitutive model, it is natural to develop particle based methods that can be applied to large portions of matter. In order to achieve this goal, large mesoscale objects must be represented by single particles, which move such that both the thermodynamic and the viscoelastic properties of the system are recovered.

The rheological response of Soft Matter usually results from a strong interplay between processes at all time and length scales, including the ones that have been removed by coarse graining. I will discuss a model in which the internal dynamics of the particles is reinstated through the introduction of a few structural parameters. I will apply our approach to describe the rheology of pressure sensitive adhesives and telechelic polymers. If time permits I will address some issues concerning the application of Brownian dynamics simulations of flowing soft matter in complex geometries.