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

船舶运动与甲板上的水和水面冲击的水动力相互作用研究

基本信息

批准号：
15360468
负责人：
KASHIWAGI Masashi
金额：
$ 5.89万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360468/
关键词：
Water on deck Green water Breaking wave Entrainment of air Wave impact CIP method Computational Fluid Dynamics MPS法

项目摘要

(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

(1)以CIP(Constrained Interpolated Profile)方法为基础，开发了计算机程序(最近被命名为RIAM-CMEN：极端非线性流体动力学计算方法)，并针对基本坝进行了验证。详细检查了破裂问题、界面捕获方案的有效性以及流体的可压缩性和表面张力的影响，然后将矩形罐侧壁处测量的压力的时间历程与数值结果进行了比较。此外，还测量了二维浮体甲板上的波浪引起的运动，并与开发的计算机程序的相应结果进行了比较。比较的总体结果是有利的，但仔细的比较表明还需要进一步的研究。用于在欧拉矩形网格框架内准确预测身体表面的压力。(2)计算机程序 RIAM-CMEN 被扩展以模拟以恒定速度前进的 3D 船舶的运动和为了验证这些计算结果，制作了长度为 2.5 m 的船舶模型，并测量了水平甲板和垂直壁上的压力。甲板上的绿水以及 Fn=0.0、0.15 和 0.20 时船舶的波浪引起的运动以及 λ/L=0.75、1.0 的波长， 1.25，对于船舶运动（浪涌、升沉和纵摇）完全固定且自由响应入射波的两种情况。（3）MPS（移动粒子半隐式）方法，这也是一种有前途的方法通过与水箱晃动和二维浮体运动（包括大波浪中的甲板上的水现象）的实验结果进行比较，也验证了该方法的有效性。通过引入计算速度的辅助方案来实现压力的计算方法，并通过计算机程序的并行化技术实现了数值计算的加速，并证实了CPU数量与降低率之间的预期关系。计算时间几乎与预测相同。

项目成果

期刊论文数量（36）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

胡長洪, 柏木正: "CIP法による波浪衝撃現象の計算精度について"第15回計算力学講演会講演論文集(神戸大学). 219-220 (2003)

胡长虹，柏木正：“关于使用CIP方法的波浪冲击现象的计算精度”第15届计算力学会议论文集（神户大学）219-220（2003）。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Experimental Simulation of Violent Sloshing and Numerical Computations

剧烈晃动实验模拟及数值计算

DOI：
发表时间：
2004
期刊：
Proceedings of the 2nd Asia-Pacific Workshop on Marine Hydrodynamics (Busan)
影响因子：
0
作者：
Tatsumi;K.;Kubota;T.;Kouguchi;N.;Okuda;S.;Arai;Y.;Z.Kishev et al.
通讯作者：
Z.Kishev et al.

A CIP Method for Numerical Simulations of Violent Free Surface Flows

暴力自由表面流数值模拟的CIP方法