Abstract
We focus on sloshing behavior of intermediate state of solid and fluid, which simply model a liquefied layer. In order to simulate the behavior, we introduce common governing equaions representing both solid and fluid materials, and develop a numerical scheme in Lagrange coordinate system. It is verified by two types of numerical simulaitons: static behavior on a tilted recutangular tank and sloshing behavior. From the simulation results, free surface shapes are different between solid and fluid.