This paper presents a computational method to predict the movements of the arbitrarily-shaped solid objects transported in 3D free-surface flows. This method can deal with the collisions among the objects and their deformations as well as the fluid-solid interactions. A T-type model is employed, in which an object is represented by multiple tetrahedron elements and contact spheres are set up near the boundaries of the object. The T-type model allows us to evaluate the inertial tensors and fluid

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... forces exactly, while it makes the evaluation of the contact forces much easy. Both T-type rigid and mass-spring models were implemented in the MICS, which is a solver for incompressible multiphase fluids, and their validity was discussed through the comparisons with experimental results.