AXISYMMETRICAL FREE-BOUNDARY PROBLEMS

We present a number of three-dimensional axisymmetric free boundary pr oblems for two immiscible fluids, such as air and water. A level set m ethod is used where the interface is the zero level set of a continuou s function while the two fluids are solutions of the incompressible Na vier-Stokes equation. We examine the rise and distortion of an initial ly spherical bubble into cap bubbles and toroidal bubbles. Steady solu tions for gas bubbles rising in a liquid are computed, with favourable comparisons to experimental data. We also study the inviscid limit an d compare our results with a boundary integral method. The problems of an air bubble bursting at a free surface and a liquid drop hitting a free surface are also computed.