摘要
本文假设气泡周围流场为无粘、无旋、不可压缩的理想流体,基于势流理论,运用边界元法模拟近边界水下爆炸气泡的动力学特征,建立气泡、壁面以及自由面三者之间复杂耦合动力学模型,在气泡运动模拟过程中引入数值光顺技术及弹性网格技术(EMT),避免因网格扭曲而导致的数值发散,开发相应的三维计算程序,并与自由表面附近气泡运动的实验数据进行对比分析,计算结果表明本文的计算方法及程序具有较高的精度。在此基础上,用本文开发的三维程序模拟了单个及多个气泡与自由表面及圆筒等复杂边界的相互作用,其中包括水面漂浮结构和水下结构,气泡在自由表面及结构的联合作用下呈现出强非线性。本主文旨在为相关复杂边界附近气泡动力学特性研究提供参考。
The fluid domain surrounding the bubble was assumed to be inviscid irrotational and incompressible ideal fluid. Beased on the potential flow theory, the dynamics of underwater explosion bubble near the boundary was simulated with boundary element method. The complex coupling dynamic models of bubble ,wall and free surface were created,and the numerical smoothing method and elastic mesh technique were used in the simulation process, and the relevant three-dimensional program was developed as well to avoid the numeric divergence induced by mesh distortion. With the 3D program , the interactions between a single bubble and multi-bubbles and the free surface and cylinder and other complex boundaries were simulated, including the floating structure and underwater structure. Bubbles take on stromg non-linearity under the combined action of free surface and structures. This paper aims to provide the preference for further research on dynamics of bubble near complex bunodary.
出处
《力学季刊》
CSCD
北大核心
2008年第1期24-32,共9页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(50779007)
高等学校博士学科点专项科研基金(20070217074)
船舶工业国防科技预研基金(07J1.1.6)
哈尔滨工程大学校基金(HEUFT07069)
关键词
气泡
边界
边界积分
自由面
势流理论
bunbble
boundary
boundary integral
free surface
potential flow theory
