Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 05, 2021 - September 08, 2021
At the Great East Japan Earthquake in 2011, various structures along the coast were damaged by tsunami. Therefore, methods for evaluating tsunami damage to structures came under extensive review. The causes of tsunami damage can be classified into two types, one is wave force, and the other is debris collision. We focused on added mass effect related to debris collision. The added mass effect is generated by motion in water. In order to clarify the effect of added mass at the time of collision, we developed simulation models for added mass effect using CFD analysis. Experimental tests corresponding to the CFD analysis of underwater collision were performed for validation. By using this model, we performed simulations of debris collision after horizontal floating to determine an added mass coefficient. We confirmed that the definition of prior knowledge about added mass effect is useful even in collisions, which are typically high-acceleration phenomena. Furthermore, we formulated an approximation of the added mass coefficient of floating debris.
