Study on Hydrodynamic Interactions of Ship Motions with Water-on deck and Green-water Impact

（1）以CIP（约束内插剖面）法为基础，开发了计算机程序（最近命名为RIAM-CMEN：极端非线性流体力学计算方法），并进行了验证。针对一个基本溃坝问题，对界面捕捉格式的有效性以及流体的可压缩性和表面张力的影响进行了详细的检验。然后将矩形贮箱侧壁压力的实测时间历程与相应的数值计算结果进行了比较。此外，波诱导运动的二维浮体甲板上的水进行了测量，并与相应的结果通过开发的计算机程序进行了比较。比较的总体结果是有利的，但一个密切的比较表明，需要进一步的研究，在欧拉矩形网格的框架内准确预测的物体表面上的压力。（2）扩充了计算机程序RIAM-CMEN ...更多信息 艾德对三维船舶在高幅波中匀速前进和摆动的运动进行了数值模拟，并将计算结果以动画形式演示。为了验证这些计算结果，制作了一个2.5 m长的船模，并测量了由于甲板上的绿水引起的水平甲板和垂直壁上的压力以及在Fn=0.0、0.15和0.20以及λ/L=0.75、1.0和1.25波长下的船舶波浪诱导运动。对于船舶运动（纵荡、垂荡和纵摇）完全固定和自由响应入射波的两种情况。（3）通过对水池晃动和含有甲板上水现象的二维浮体运动的数值模拟，验证了MPS（Moving Particle Semi-implicit）方法的有效性。通过引入速度计算的辅助格式，对压力计算方法进行了改进。通过计算机程序的并行化技术也实现了数值计算的加速，并确认CPU数量和计算时间减少率之间的预期关系与预测几乎相同。少

(1)With the CIP (Constrained Interpolated Profile) method used as a basis, a computer program (which was recently named as RIAM-CMEN : Computation Method for Extremely Nonlinear hydrodynamics) was developed and its validation was conducted. For a fundamental dam-breaking problem, validity of the interface capturing scheme and the effects of compressibility and surface tension of a fluid were checked in detail. Then the time history of the pressure measured at the side wall of a rectangular tank was compared with corresponding results by the numerical computation. Furthermore, wave-induced motions with water on deck of a 2-D floating body were measured and compared with corresponding results by the developed computer program. The overall result of comparison was favorable, but a close comparison suggests that further research is needed for accurate prediction of the pressure on the body surface in the framework of Eulerian rectangular grids.(2)The computer program, RIAM-CMEN, was extend … More ed to simulate the motions of a 3-D ship advancing with a constant speed and oscillating in high-amplitude waves, and computed results were demonstrated as an animation. To validate these computed results, a ship model of 2.5 m in length was manufactured, and measurement was performed for the pressure on the horizontal deck and vertical wall due to the green-water-on-deck and for wave-induced motions of a ship at Fn=0.0, 0.15, and 0.20 and for wavelengths of λ/L=0.75, 1.0, and 1.25, for both cases of ship motions (surge, heave, and pitch) being completely fixed and free to respond to the incident wave.(3)The MPS (Moving Particle Semi-implicit) method, which is also a promising method for extremely nonlinear hydrodynamic problems, was also validated through comparisons with experimental results for the sloshing in a tank and motions of a 2-D floating body including the water-on-deck phenomenon in large waves. Improvement was achieved for the calculation method of the pressure by introducing an auxiliary scheme for calculating the velocity. Acceleration of the numerical computation was also achieved with a parallelization technique for the computer program, and it was confirmed that the expected relation between the number of CPU and the reduction rate in the computation time was almost the same as that predicted. Less