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MM: Fachverband Metall- und Materialphysik

MM 59: Phase Transitions I

MM 59.5: Vortrag

Donnerstag, 25. März 2010, 15:00–15:15, H5

Microstructure simulations of porous media, of cell motion in flow fields and the interaction with structured surfaces — •Britta Nestler, Ali Aksi, Michael Selzer, Marcus Jainta, and Frank Wendler — Institute of Materials and Processes, Karlsruhe University of Applied Sciences, Karlsruhe, Germany

A Lattice-Boltzmann method for modelling fluid flow is coupled with the dynamic equations of a phase-field model for phase transformations and microstructure evolutions in multiple order parameter systems. The model contains a formulation for phases with preserved volume fractions and an extension for considering pressure differences in the various phase regions. The combined approach is applied to dry and wet foams and to computationally evaluate the permeability and microporosity in porous media. At the phase boundaries, we employ a smooth formulation of a bounce-back condition related to the diffuse interface profile. Simulations of fluid flow in static porous media with stationary non-moving interfaces and in microstructures performing a dynamic evolution of the boundaries are presented. We further study the motion of particles in a shear flow and measure the effective viscosity of the fluid for different particle distributions, channel geometries, volume fractions and properties of the fluid. The method is also capable to investigate the behaviour of liquid droplets on top of structured surfaces. The results are compared with experiments related to the Lotus effect for different surface energies and contact angles in the presence and absence of fluid flow.