VOF method on unstructured grid using PISO algorithm

A volume of fluid (VOF) interface reconstruction technology based on PISO algorithm was developed on unstructured collocated grid. The finite volume method on collocated grid was used for the discretization of momentum equation, the PISO algorithm was adopted for the coupling solution of velocity and pressure, and the velocity based on momentum interpolation method was applied to eliminate the unreasonable pressure field. The PLIC-VOF method on unstructured grid was used for the interface reconstruction, considering the interphase surface tension. With this algorithm, the deformation process of the elliptical droplet under the surface tension was simulated to test the feasibility of this algorithm.