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Nonlinear wave response analysis of very large floating structures subjected to nonlinear random waves in variable water depth

变水深非线性随机波作用下超大型浮式结构的非线性波响应分析

基本信息

批准号：
14350243
负责人：
UTSUNOMIYA Tomoaki
金额：
$ 7.81万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

In this research, nonlinear wave response analysis of very large floating structures subjected to nonlinear random waves in variable water depth has been investigated. The main objective is to develop a computer simulation program for accurate and efficient evaluation of wave response of a Very Large Floating Structure(VLFS) located in variable depth sea subjected to nonlinear waves.In the fiscal year of 2002, wave-field analysis program was considered using plane 2-d model. The developed program can express the wave-propagation onto the inclined beach, and the applicability to the strong non-linear wave has been confirmed. Also, the wave diffraction analysis program around an arbitrary shape floating body in the frequency domain has been developed ; where the bichromatic waves can be considered.In the fiscal year of 2003, the wave diffraction analysis program subjected to bichromatic and bidirectional waves has been developed, where 2^<nd> order nonlinear waves can be considered. Slow … More drift oscillation of a large pontoon including the effect of elastic deformation has been analyzed by the developed program, and it has been clarified that the conventional approximate method using constant drift force would fail, unless the second order diffraction force is considered rigorously. Also, the acceleration method for application to a very large floating structure in the computational point of view has been examined, and the accelerated program has been developed.In the fiscal year of 2004, the wave diffraction analysis program subjected to bichromatic and bidirectional waves has been completed and extended to cover the analysis of non-linear wave run-up analysis around the floating structure. Also, in the acceleration algorithm using the multipole expansions, the convergence characteristics for iterative solver is the key point for computation time reduction ; thus, the research for modifying the iterative solver has been made, and finally, the reduction of computation time up-to 1/5 -1/10 has been obtained. Less

本文研究了变水深非线性随机波作用下的大型浮体结构的非线性波动响应分析。主要目的是开发一个计算机模拟程序，以准确有效地评估位于变深海域的超大型浮动结构（VLFS）在非线性波浪作用下的波浪响应。在2002财政年度，波场分析程序被考虑使用平面二维模型。所开发的程序能很好地表达波浪在倾斜海滩上的传播，并证实了该程序对强非线性波浪的适用性。此外，还开发了任意形状浮体的频域波衍射分析程序；这里可以考虑双色波。在2003财政年度，开发了双色波和双向波作用下的波衍射分析程序，其中可以考虑2^<和>阶非线性波。利用所编制的程序分析了大型浮桥的慢、多漂移振荡，并对弹性变形的影响进行了分析，表明除非严格考虑二阶衍射力的影响，否则常规的恒漂移力近似方法是不可行的。同时，从计算角度探讨了适用于超大型浮式结构的加速方法，并编制了加速程序。2004财年，完成了双色波和双向波作用下的波衍射分析程序，并扩展到浮式结构周围的非线性波爬升分析。在采用多极展开的加速算法中，迭代求解器的收敛性是减少计算时间的关键；因此，对迭代求解器进行了改进研究，最终使计算时间减少了1/5 ~ 1/10。少