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Basics : Rising Bubble

This input is based of the famous 2D rising bubble benchmark problem used to evaluate numerical algorithms for bi-phasic flow and surface tension. It uses some features of the levelset solver introduced in LS-DYNA R15. The levelset advection uses a semi Lagrangian approach. The levelset re-initialization uses a closest Point algorithm and the Laplace-Beltrami approach is used to handle the surface tension effects at the interface between the two fluids.