Development of coupling simulation system between nonlinear sloshing/swirling load and ship motion in waves

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15226
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 24020:Marine engineering-related
• Research Institution: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: MA CHONG 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (30773197)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 両方向連成解析 / LNG船 / スロッシング / スワリング / 粒子法 / 3次元パネル法 / 数値計算

Outline of Final Research Achievements

A numerical model about sloshing in tank is proposed and enhanced based on the particle method. The prediction accuracy of the numerical model is proved by comparing with the sloshing model test. Moreover, the two-way hybrid coupling model based on particle method and linear 3D panel method is developed to simulate the interactive behavior between sloshing load in tank and 6DOF ship motion in waves. The nonlinear influence of sloshing and swirling load on ship motion is discussed. Both hybrid and linear models are validated against the experimental data of the LNG scale ship model test. The characteristic of both hybrid model and linear model is demonstrated. Based on the simulation results of hybrid model, the sloshing decay parameters is obtained, which can be utilized to improve the performance of the linear model.

Free Research Field

船舶海洋工学

Academic Significance and Societal Importance of the Research Achievements

LNGの安定供給と輸送効率向上のニーズに応えるためには、LNG船及びタンクの大型化を図る必要がある。本研究の研究成果に基づき、波浪中LNG船に関するタンク内流体応答と船体運動の相互作用を解析する事が可能であり、LNG船の運航安全性の評価に資する。予測精度が高いHybrid数値モデルと計算効率が高い線形モデルの構築により、最悪短期海象でのLNG船の安全性評価及び長期予測最大荷重の設定に活用できる。本研究で開発した数値モデルはFPSOと呼ばれる生産・貯藏・積出し用の施設を対象とした解析にも結び付く。粒子法によるスロッシングの解析は、陸上石油貯蔵タンク等汎用タンク内流体解析にも有効活用できる。