Phase-Field Simulations of Foam AgeingThursday (08.10.2020) 14:20 - 14:40
The research project is concerned with liquid foam templating in the context of lightweight materials design. We aim for a computer-aided design of foams with tailor-made microstructures. The focus of the project is to create a digital model that provides insight into the relation of microstructure and properties of liquid foams, and is intended to accompany the processing route of open pore metal foams.
Controlling the microstructure formation process in aqueous foams is key to tailoring foam evolution and thus the resulting structures with defined geometries and properties.
This requires understanding how different processes underlying foam evolution influence pore structure formation. In this work, the dynamics of dry foam evolution determined by curvature minimisation and coalescence events is studied numerically. A model to describe gas bubbles undergoing spontaneous isolated coalescence as well as structural rearrangements is developed to map different processes during foam evolution. To predict the microstructure evolution, we use a numerical simulation method based on a phase-field model to perform large scale parallel simulations of 3D gas bubble ensembles. Phase-field simulations focusing on configurations of few individual bubbles allow for investigation of the coalescence behaviour. Considering bubble ensembles, the relaxation of the pore structure into equilibrium can be studied, with regard to topological changes. The modelling approach yields the temporal dynamical evolution of foams with different bubble size distributions based on successive coalescence processes. Studies of several thousand bubbles are conducted and analysed to investigate microstructure evolution.