【摘要】 本文采用二维解析和一维离散的方法处理无限流体介质,建立了一种分析结构与外流体动力相互作用问题的半解析无限元法,使结构与流体的耦合振动以及波浪对弹性结构绕流等三维问题化为一维问题来求解,从而在很大程度上节省了单元、内存与计算工作量,同时径向无限域边界可得以正确模拟,比现有的有限边界人工处理更显优越,文中建立了适于不同结构类型的环单元与锥单元,给出了算例与比较。更多还原

【Abstract】 For structure-fluid dynamic interaction problems, a semianalytical infinite element method is presented in this paper. The pressure function of infinite fluid medium is analytical in two directions and discrete in another one, then three-dimensional interaction problem including coupled structure-fluid vibration and surface wave flow over elastic structure etc. are reduced to one-dimensional one. The number of elements, core requirement and the cost of computing are reduced considerably, and the infinite boundary in the radial direction is now modelled more accurately in comparison with; some current methods in which artificial finite boundary is placed. Annular and conical composite elements are proposed to suit different structures, and examples are presented for comparison.更多还原