Performance analysis of interface tracking method——VOSET for complex two-phase flows

The interface tracking method—VOSET(coupled Volume-of-Fluid and Level Set method)combines the advantages and overcomes the disadvantages of VOF and Level Set.In this method,VOF was used to capture interfaces,which can completely keep the mass-conservation and overcome the disadvantage of mass-nonconservation in Level Set.A geometrical operation was used to calculate the Level Set function near interfaces,which could be used to compute the accurate curvature and smooth the discontinuous physical quantities near interfaces,then,the disadvantage of VOF,inaccuracy of curvature and bad smoothness of discontinuous physical quantities near interfaces,could be overcome.Therefore,VOSET was more accurate than VOF and Level Set.In this paper,VOSET was used to simulate the rising and coalescence of two or multi-gas bubbles.Mass conservation,feasibility of iterative geometric operation and stability of solution process of VOSET were analyzed for these complex two-phase flow problems.This research works would lay a foundation for the wide application of VOSET.