冲击波作用下水中结构流固耦合高效数值模拟方法研究

项目名称： 冲击波作用下水中结构流固耦合高效数值模拟方法研究

项目编号： No.11272299

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 李上明

作者单位： 中国工程物理研究院总体工程研究所

项目金额： 72万元

中文摘要： 水中结构冲击波作用下的动力响应、舰艇声辐射等问题本质上是由水中结构与其周边无限水域构成的动力学问题。这类问题的技术难点在于高效准确地模拟无限水域及水下冲击波施加在结构上的载荷。本课题拟以提高这类问题计算效率为目的，基于比例边界有限元法连分式理论，拟发展模拟无限水域的高阶传递边界，建立其收敛条件，探讨阶数对其正确性和收敛性的影响及其在大规模计算中的应用可行性。将该高阶传递边界与声学近似法和水下爆炸理论相结合，通过场分离技术，建立水下冲击波、结构散射波等施加在水中结构上的载荷表述方法。利用有限元法模拟水中结构和其周边的有限水域，高阶传递边界模拟无限水域，通过载荷传递法及考虑局部空泡效应，建立基于声学近似法、高阶传递边界、有限元法等方法的流固耦合数值模拟方法，并通过数值算例论述其高效性，从而为水中结构的环境载荷、安全性评估等提供一种高效数值模拟理论。

中文关键词： 水中结构；流固耦合；水下冲击波；高效数值模拟方；无限水域

英文摘要： Some problems，such as submerged structures responses under shock waves and submarine sound radiation problems, essentially belong to dynamics problems composed of submerged structures and their surrounding unbounded fluid.The difficulty of this type of problem is to model accurately and effciently unbounded fluid and loadings acting on structures caused by underwater shock waves.To aim for improving the analysis efficiecy of this problem, this project will develop a high-order transmitting boundary to model unbounded fluid, based on the continued-fraction formulation of the scaled boundary finite element method, build its convergent condition, and discuss its order's effects on the accuracy and efficiency of the transmitting boundary and its feasibility in large-scale problems. A loading evaluation method of underwater shock waves and scattered waves will be derived based on underwater explosion theory, acoustic approximation method and the transimtting boundary through using a field separation technique, which will be used to determine loadings acing on submerged structures. A fluid-structure coupling numerical method considering local cavitation effect will be proposed through loading transmitting method, in which FEM is used to model submerged structures and its surrounding bounded fluid and the developed hig

英文关键词： underwater structure；acoustic-structure interaction；underwater shock wave；efficient numerical method；infinite fluid