The dynamics of foams with mobile interfaces

Using a novel technique for resolving nearly singular integrals, we investigate the dynamics of two-dimensional foams with mobile interfaces and an incompressible, inviscid gas phase by a boundary integral method. For foams with small liquid fractions ($\le 5\%$), we observe node motion, lamellar bending, drainage, and T1 transitions. Node motion occurs on the fastest timescale and is well-described by considering only the surface forces on each Plateau border. The lamellar bending is characterized by viscida theory, but the drainage occurs at a different rate than predicted by the asymptotic theory for the examples studied. Topological transitions occur on a timescale intermediate to Plateau border rearrangement and drainage.