Simulations of two-dimensional foam rheology: Localization in linear Couette flow and the interaction of settling discs

摘要

Surface Evolver simulations of flowing two-dimensional foams are described. These are used for two purposes. Firstly, to extract the location of the T1s, the changes in bubble topology that occur during plastic flow. It is shown that in linear Couette flow the T1s are localized in space, becoming more so as the polydispersity of the foam decreases. Secondly, the sedimentation of two circular discs through a foam under gravity is studied. If the discs are sufficiently close, they begin to interact and one moves behind the other during their descent.