两层流体中振荡水平圆柱潜体水动力特性  

Hydrodynamic characteristics of a submerged pulsating circular cylinder in a two-layer fluid of finite depth

作　　者：尤云祥[1] 杜明明[1] 魏岗[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200030

出　　处：《海洋工程》2007年第3期7-17,共11页The Ocean Engineering

基　　金：国家自然科学基金资助项目(10572092;50323004);高等学校博士点基金资助项目

摘　　要：研究了有限深两层流体中水平圆柱潜体的振荡辐射问题。在线性势流理论框架内,建立求解辐射势的多极展开理论,提出附加质量和阻尼系数的计算方法,进行了数值计算分析,并且与均匀流中的情况进行比较。结果表明,在圆柱潜体的某个振荡频率范围内,流体的分层效应对其附加质量和阻尼系数是有重要影响的。同时,对水平圆柱潜体振荡产生的自由面和内界面波动特性进行了数值分析。This paper considers the radiation problem of a submerged circular cylindr in a two-layer fluid of finite depth. Under the linear potential theory, the theoretical solution for the radiation potential generated by the pulsating circular cylinder is obtained based on the multiple expansion method. The method for the calculation of the added mass and damping coefficient of the submerged circular cylinder is presented, and the results are compared with the analytical results in the case of the single-layer fluid. The numerical results show that the density stratifi- cation can have a relative large effect on the added mass and damping coefficient of the submerged circular cylinder over a wide range of frequencies. The free-surface and interface waves generated by the pulsating circular cylinder are also considered.

关 键 词：两层流体 内波 水平圆柱潜体 附加质量 阻尼系数 

分 类 号：U661.1[交通运输工程—船舶及航道工程]