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6 papers · 1 filter
A study of fragmentation processes using a discrete element method
Ferenc Kun, Hans J. Herrmann
We present a model of solids made from polygonal cells connected via beams. We calculate the macroscopic elastic moduli from the beam and cell parameters. This modellisation is par…
A reaction-diffusion model for the hydration/setting of cement
F. Tzschichholz, H. J. Herrmann, H. Zanni
We propose a heterogeneous reaction-diffusion model for the hydration and setting of cement. The model is based on diffusional ion transport and on cement specific chemical dissolu…
FRACTURING OF BRITTLE HOMOGENEOUS SOLIDS. FINITE SIZE SCALINGS
Frank Tzschichholz
Using a two dimensional lattice model we investigate the crack growth under the influence of remote tensile forces as well as due to an internally applied pressure (hydraulic fract…
Number of branches in diffusion-limited aggregates: The skeleton
Stefan Schwarzer, Shlomo Havlin, Peter Ossadnik +1
We develop the skeleton algorithm to define the number of main branches of diffusion-limited aggregation (DLA) clusters. The skeleton algorithm provides a systematic way to r…
Sedimentation and Flow Through Porous Media: Simulating Dynamically Coupled Discrete and Continuum Phases
Stefan Schwarzer
We describe a method to address efficiently problems of two-phase flow in the regime of low particle Reynolds number and negligible Brownian motion. One of the phases is an incompr…
On Hydrodynamic Diffusion and Velocity Fluctuations in Two--Dimensional Simulations of Sedimentation
W. Kalthoff, S. Schwarzer, G. H. Ristow +1
We present a numerical method to deal efficiently with large numbers of particles in incompressible fluids. The interactions between particles and fluid are taken into account by a…