深海立管内波作用的动力特性及海洋环境联合作用的极值响应研究

项目名称： 深海立管内波作用的动力特性及海洋环境联合作用的极值响应研究

项目编号： No.51279187

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 水利工程

项目作者： 郭海燕

作者单位： 中国海洋大学

项目金额： 80万元

中文摘要： 深海立管是海洋工程结构的重要部件。内波对海洋工程结构会造成严重威胁，而对于贯穿整个海洋水深范围内的立管威胁更大，然而由于世界主要产油区墨西哥湾、巴西海域及西非海域内波活动较少，当前国际相关规范并未考虑内波作用。本项目基于南海内波监测数据，在二维分层流水槽做圆柱体内波波阻实验和立管结构动力响应试验，建立内波对细长结构作用力模型，应用非线性动力学、水动力学理论和有限元法，研究深海立管在内波作用下的非线性动力特性和动力响应；综合考虑内波、海流、波浪等海洋环境要素，对深海立管非线性大幅度耦合运动响应进行数值模拟，研究立管在海洋环境荷载联合作用下的极值响应。本研究目标是给出立管在内波作用下的动力特性，提出基于流体力模型的立管内波作用动力响应分析方法，揭示立管在波浪、流、内波等海洋环境荷载联合作用下的失效机理，建立相应的破坏准则，为深海立管设计、安全运行提供科学依据。

中文关键词： 内波；竖直圆柱体；深水立管；海洋环境；动力特性

英文摘要： Deep-sea riser is an important part of offshore engineering. The impact of internal waves on offshore structures can not be ignored, moreover, internal wave may be a serious threaten to the safety of deep-sea riser which get through the whole depth of seawater. However, because internal wave is inactive in the world main oil-producing area, such as the Gulf of Mexico, West Africa and Brazil, the internal wave has not been considered in any international marine engineering specifications. The wave resistance of cylinder in internal wave and the dynamic responses of riser under internal wave are studied experimentally in the 2D stratified flow tank. Meanwhile, the data monitored in South China Sea is used as the basis of the experiments above mensioned. A force model which expresses the act on slender marine structures by internal wave will be built. To study the nonlinear dynamic characteristics and dynamic responses of marine riser, nonlinear dynamics, hydrodynamics and the finite element method are applied and the marine environment element such as internal wave, current and surface wave was concerned. The nonlinear dynamic response and extreme response of deepwater riser under combined excitations are simulated numerically. The aim of this project is to obtain the dynamic characteristics of deep-sea riser unde

英文关键词： Internal wave；Vertical cylinder；Deep water riser；Marine environment；Dynamic characteristics