Multiphase-Model to Predict Arbitrarily-Shaped Objects Moving in Free Surface Flows

摘要

This paper deals with a multi-phase model to predict the movements and transportations of the arbitrarily-shaped objects in free surface flows, such as the driftwoods and debris transported by wave flows and Tsunamis. In the prediction method, MICS (Multiphase Incompressible-flow solver with Collocated grid System), the solid objects in free-surface flows are treated as the multiphase phenomena, consisting of gas, liquid and solid phases. This multiphase field is modeled as a fluid-mixture composed of the immiscible and incompressible fluids which have different physical properties. The solid object, which is treated as a rigid body, is represented by multiple tetrahedron elements. Since the fluid-solid interactions are adequately taken into account, no empirical constants, such as a drag coefficient, are needed in the computational method. The validity of the MICS was discussed through the comparisons with some basic experimental results.