A Multiphase Compressible–Incompressible Particle Method for Water Slamming

This paper presents a novel compressible–incompressible multiphase projection-based particle method for the prediction of water slamming pressures. The particle method considered is an extended version of an enhanced multiphase moving particle semi-implicit (MPS) method. The proposed method solves an integrated form of Poisson pressure equations (PPEs) for the liquid and gas phases. To further enhance accuracy, a modified version of the previously developed ECS scheme is devised for the gas phase through calculations of minimum and maximum theoretical base values for activation of the ECS scheme, thus imposing an allowable range of density variations for the compressible phase. Verifications are conducted by means of 2D liquid impact and impacts of rigid plates on flat water surfaces.