津波による船体動揺シミュレーションの精度向上: 流速評価の精度向上

摘要

著者らは地震津波による係留船舶の動揺シミュレーション手法を提案し、当該シミュレーションを活用して、津波到達前から津波に含まれる長周期波成分との共振や流れによる自由振動により長周期船体運動であるSway，Surge に大きな動揺が発生し始め、係留索の破断や防舷材の過圧縮の危険性のあることを指摘した。%In our previous study, we proposed the numerical simulation procedure of moored ship motions induced by tsunami, and investigated the effects on ship motions and mooring loads, considering berth location, ship's dimension and mooring system. In some cases, large ship movements beyond the safe mooring conditions were induced by the surface elevation, the currents and a resonance effect with natural periods of sway or surge of the moored ships. In the proposed method, the calculated horizontal currents were not able to be reproduced well, compared with those by the tsunami simulation directly. In this paper, we investigate the difference of the currents, and improve the accuracy of the connection between the tsunami simulation and the simulation of the moored ship motions.