Numerical investigation of a three-dimensional compressible multiphase flow model for the suction effect during freak wave impact on a deck

The freak wave impacting a deck with a sharp corner can occur air entrapment. After the freak wave breaks, the trapped air at the bottom of the structure forms a suction effect (i.e. negative pressure) and bubble ruptures near the structure's wall, both of which will lead to the destruction and safety failure of the structure. It is a challenging topic to numerically realize the process of the freak wave slamming on the deck based on three-dimensional compressible multiphase flow. This paper implements the CPU parallel framework through MPI and OpenMP. The CIP(Constrained Interpolation Profile) method is adopted for the convective phase and the THINC/SW(Tangent of Hyperbola for Interface Capturing with Slope Weighting Scheme) method is applied to capture the free surface. The equation of state is added to help the present model realize the unified treatment of compressible region and uncompressed region. The present model is used to study the strong nonlinearity of the freak wave slamming on a box-shape deck with different water depths and wave heights. The importance of a compressible model for the prediction of impact pressure is proved, and the characteristics of wave impact and the mechanism of suction effect are discussed. This is helpful to understand the slamming process of the freak wave.