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DY: Fachverband Dynamik und Statistische Physik
DY 57: Poster - Diffusion
DY 57.9: Poster
Thursday, March 19, 2015, 16:00–18:00, Poster A
Simulation of Anomalous Transport in Model Crowded Media — •Markus Spanner1, Felix Höfling2, Gerd E. Schröder-Turk1, and Thomas Franosch3 — 1Institut für Theoretische Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 2MPI für komplexe Systeme and IV. Institut für Theoretische Physik, Universität Stuttgart, Germany — 3Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck, Austria
We study large-scale computer simulations of particles in 2d and 3d dense-packed porous systems. Subdiffusive dynamics δ r2(t)∼ t2/z, z>2 can be observed at a critical obstacle density, when the tracer particle can barely squeeze through between the host structure.
Starting from the Lorentz model, which simply consists of a point-like tracer moving through an array of random overlapping spheres, we modify a number of simulation details (tracer dynamics, obstacle distribution, introduction of an external force) one at a time – from most simple towards more realistic porous systems. By extracting critical exponents of the dynamics in these systems, we gain a better understanding of the universal or non-universal nature of the observed exponents.