We present various lattice Boltzmann models which reproduce the effects of rough walls, shear thinning and granular flow. We examine the boundary layers generated by the roughness of the walls. Shear thinning produces plug flow with a sharp density contrast at the boundaries. Density waves are...

We investigate cellular automata in four and five dimensions for which Chaté and Manneville recently have found nontrivial collective behaviour. More precisely, though being fully deterministic, the average magnetization seems to be periodic respectively quasiperiodic, with superimposed noise...

We introduce the concept of damage spreading in the context of Monte Carlo dynamics. This provides us with an efficient method to calculate correlation functions and generates the clusters of the fluctuations in magnetization. These clusters have at Tc the fractal dimension d-β/ν. In general,...

A simple model for gelation of monomers in a solution under shear has been studied at different concentrations in two dimensions. Different properties of the clusters like the length R and width W of the clusters, and the angle θ formed with the negative x-direction are determined as a function...

Clusters of infected individuals are defined on data from health laboratories, but this quantity has not been defined and characterized by epidemy models on statistical physics. For a system of mobile agents we simulate a model of infection without immunization and show that all the moments of...

We study a decomposition process where all nodes with a targeted degree are removed from the network. Each removal step results in changes in the degrees of the remaining nodes, and other nodes may attain the targeted degree. The processes continue iteratively until no more nodes with the...

We present a simple model for the friction of two solid bodies moving against each other. In a self-consistent way we can obtain the dependence of the macroscopic friction force as a function of the driving velocity, the normal force and the ruggedness of the surfaces in contact. Our results are...

High resistance concrete or hard ceramics needs extremely dense granular packings which can only be realised when the size distribution of grains follows a powerlaw. We discuss the perfectly dense limit, namely Apollonian packings in three dimensions and show in particular the existence of space...

We present a numerical study of the dynamics of one falling oblate ellipsoid particle in a viscous fluid, in three dimensions, using a constrained-force technique (Doctoral Thesis, Stuttgart University, 2000, Phys. Rev. E 61 (2000) 7146, J. Eng. Math. 41 (2001) 221). We study the dynamical...

We use FLUENT to calculate the wind profile over barchans and transverse dunes. The form of the streamlines of flow separation at the lee side of the dunes is determined for a symmetric barchan dune in three dimensions, and for the height profile of a measured transverse dune field in the...