Regensburg 2019 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Granular Matter / Contact Dynamics
DY 25.9: Vortrag
Mittwoch, 3. April 2019, 12:00–12:15, H3
Numerical investigation of shear-induced incipient particle motion on regular substrates — •Björn König1, Othmane Aouane1, Nikola Topic2, Andreas Wierschem2, and Jens Harting1, 3 — 1Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Nürnberg, Germany — 2Institue of Fluid Mechanics, Friedrich-Alexander-Universtät Erlangen-Nürnberg (FAU), Erlangen, Germany — 3Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands
Incipient motion of particles is important in different natural and industrial processes. The aim of this work is the numerical simulation of the motion of a single spherical particle placed on a fixed regular substrate bed subjected to a laminar shear flow. The bed is a monolayer of quadratically arranged spheres of the same size as the top particle. Varying the distance between the substrate particles provides different exposure degrees of the single sphere to the flow. The numerical framework utilizes the lattice Boltzmann method (LBM) for the flow field coupled with the discrete element method (DEM) to solve the particle dynamics.
We first determine the critical conditions for incipient particle motion. Critical conditions are characterized by the dimensionless Shields number, describing the ratio of acting stress to the effective particle weight. Second we study the displacement of the single sphere over the substrate at super-critical conditions. The outcomes of the numerical simulations are benchmarked against experimental results.