Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 22: Slow Dynamics in Glasses and Granular Matter I (Joint Focus Session with DY and CPP)
DF 22.8: Vortrag
Donnerstag, 3. April 2014, 12:00–12:15, HÜL 186
Lattice Boltzmann Simulations for Glass-Forming Liquids — •Simon Papenkort1,2 and Thomas Voigtmann1,2 — 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt, Köln, Germany — 2Zukunftskolleg und Fachbereich Physik, Universität Konstanz, Germany
In continuum mechanics, the Navier-Stokes (NS) equation is used to study fluid flows. The Lattice Boltzmann (LB) model is an efficient method to find solutions of the NS equation of Newtonian liquids even for complex flow geometries.
Complex fluids, such as glass formers, colloidal suspensions, or granular media, display a wide range of non-Newtonian flow effects, determined by the interplay between slow structural dynamics on the microscopic scale, and the mesoscopic flow field. Prominent examples are shear thinning and yield stresses, leading to plug flow in channels.
Starting from first principles, mode coupling theory of the glass transition is able to provide constitutive equations that describe the history effects determining the flow of glass-forming fluids. We present results from a new LB scheme that allows to include memory-integral effects in fluid-mechanics simulations.