NUMERICAL PREDICTION FOR FLUID FORCES ACTING ON 3D COMPLICATED-SHAPED OBJECTS IN FREE-SURFACE FLOWS

摘要

The focus of this paper is on the applicability of the computational method used to predict the fluid forces acting on the complicated-shaped solid objects included in free-surface flows. The computational method, MICS, enables us to predict the fluid forces on the basis of the pressure and viscous terms of the governing equations for incompressible multiphase fields. A solid object is represented by multiple tetrahedron elements and their volume fractions included in a fluid-cell are evaluated with a tetrahedron sub-cell method. The predicted results were compared with the measured fluid forces against a wave breaking block placed in free-surface flows. As a result, it has been demonstrated that the computational method allows us to predict the difference of the fluid forces according to the block attitudes and the relationship between the fluid forces and wave heights.