A RBF Cut-Cell Finite Volume Two-Phase Method for Immersed Moving Boundaries

摘要

By design of a mass-force coupling model, we in this paper em-phasize to study problems involving water entry/exit of twin rigidbodies in the confined tank by our RBF cut-cell finite volume two-phase model. The study helps to elucidate mechanics for designand safety assessments of ship and offshore structures in the oceanenvironment. Numerical simulation is carried out with our designof a sharp interface method for two-phase flows, constructed bya highly efficient Navier-Stokes solver with a novel VOF tech-nique and a dynamic subgrid-scale model. Additionally, the fic-tional grid merging technique is introduced to our RBF cut-cell fi-nite volume two-phase approach that incorporates the mass-forcemodel.Grid refinement studies are performed for test problems in-volving rigid wedgy-body entry/exit. Very encouragingly, the re-sults agree with measurements available. Of particular interest isthe instantaneous velocity field, as the relevant feature can providea valuable base for the analysis of water impact of a multibody, byour two-phase solver.