Improvement of conservative property and interface resolution of mesh-based two-phase flow simulation algorithms for splashing fluid behaviors

This study is concerned with improvement of numerical code called CRIMSON (Civa RefIned Multiphase SimulatiON), which has been developed to evaluate multi-phase flow behaviors based on the recent CFD (computational fluid dynamics) techniques. The CRIMSON employs a finite-volume method combined with the high order interpolation scheme, CIVA (cubic-interpolation with area/volume coordinates). The CRIMSON solves gas–liquid two phases by a unified scheme of CUP (combined unified procedure). The conventional CIVA method has two problems of losing interface sharpness in long-term calculation and non-conservativeness. In this study, the problems were solved by introduction of the ideas of the level set method and the phase field method. We verified our method by applying it to some popular benchmark problems of single bubble rising and collapse of water column problems.