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When tsunami hits a harbor, the destruction of the structures in the coastal area is caused not only by the wave force but also by driftage collision. If the structures are destroyed, the wrecks might be drifted and cause further destruction. The main purpose of this paper is to develop the numerical analysis code for predicting the driftage behavior in tsunami run-up. The features of this method are (1) to be applied to the motion of driftage object with FAVOR method and (2) to be applied to a flow involving free surface with VOF method. The method is applied to the vertical oscillation of the driftage near the free surface and the horizontal motion of driftage with tsunami run-up. As the results, this method properly simulate the vertical oscillation and the horizontal movement of the driftage object. The obtained numerical solution of driftage horizontal velocity agrees well with the result of hydraulic experiment.

NUMERICAL ANALYSIS FOR THE BEHAVIOR OF THE DRIFTAGE WITH TSUNAMI RUN-UP USING FAVOR METHOD