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计入气穴的水下爆炸作用下结构流固耦合三维数值模拟

ISSN号：1000-0887
期刊名称：应用数学和力学
时间：0
页码：1115-1128
分类：O383.1[理学—流体力学;理学—力学] U661.43[交通运输工程—船舶及航道工程;交通运输工程—船舶与海洋工程]
作者机构：[1]哈尔滨工程大学船舶工程学院,哈尔滨150001, [2]中国舰船研究设计中心,上海201102
相关基金：新世纪优秀人才支持计划基金资助项目（NCET100054）; 第十二届霍英东教育基金资助项目（121073）; 国家自然科学基金委员会-中国工程物理研究院联合基金资助项目（10976008）; 国家自然科学基金重点资助项目（50939002）
相关项目：水下爆炸气泡与弹性边界相互作用的数值模拟研究

关键词：水下爆炸, 谱单元法, 流固耦合, 气穴, 球壳, 板架, underwater explosion, spectral element method, fluid-structure interaction, cavitation, spherical shell, stiffened plate

中文摘要：

水下爆炸在结构物面附近产生的气穴现象,严重影响水下爆炸作用下的流固耦合动响应,是舰船水下爆炸领域的难点,传统的边界元方法、有限元方法（FEM）难以解决水下爆炸气穴现象这类强非线性问题.针对此问题,计及流体中的气穴现象,考虑流体的可压缩型,忽略流体粘性,建立水下爆炸瞬态强非线性流固耦合三维数值模型,采用流体谱单元方法（SEM）和结构有限元方法求解该模型.计算结果表明：相对有限元法,谱单元法具有更高的计算精度,且谱单元解与解析解、试验值吻合良好.在此基础上,结合ABAQUS软件,分别探讨三维球壳、船体板架在水下爆炸作用下的瞬态流固耦合机理,给出气穴区域及其对水中结构物动响应的影响特征,旨在为舰船水下爆炸瞬态流固耦合问题的相关研究提供参考.

英文摘要：

In an underwater-shock environment,cavitation occurs near the structural surface.The dynamic response of fluid-structure interaction is influenced seriously by the cavitation effects.It is also the difficulty in the field of underwater explosion.With traditional boundary element method and finite element method（FEM）,it is difficult to solve the nonlinear problem with cavitation effects subjected to underwater explosion.To solve this problem,in consideration of the cavitation effects and fluid compressibility,with fluid viscidity neglected,a 3-D numerical model of transient nonlinear fluid-structure interaction subjected to underwater explosion was built.Fluid spectral element method（SEM） and finite element method were adopted to solve this model.After comparison with FEM,it is shown that SEM is more precise than FEM,and the SEM results are in good coincidence with benchmark results and experiment results.Based on this,combined with ABAQUS,the transient fluid-structure interaction mechanism of 3-D submerged spherical shell and ship stiffened plates subjected to underwater explosion were discussed,and the cavitation region and its influence on the structural dynamic responses were presented.The reference for relevant researches on transient fluid-structure interaction of ship structure subjected to underwater explosion is provided.

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