分层海洋中大直径桩柱的波浪力

The Wave Force on a Large Diameter Cylinder in Stratified Ocean

研究了在两层流体中大直径桩柱的水动力特性 .基于分离变量方法 ,建立了绕射势的级数解 ,导出了作用于大直径桩柱上的绕射力的计算公式 .与单层流体不同的是 ,对两层流体 ,由于内波的存在 ,作用在大直径桩柱上的绕射力 ,除了自由表面波绕射力外 ,还存在内波绕射力的作用 .对所建立的绕射力的求解模型进行了数值模拟 ,并与单层流体的情况进行了比较 ,得到了一些有意义的结果 .

The paper is aimed to study the hydrodynamic characteristics of a large diameter cylinder in a two-layered fluid. A formal potential solution for the diffraction problem was established, and the computational formulation for the corresponding diffraction force was given. The diffraction force on the large diameter cylinder in a two-layered fluid includes not only the diffraction force produced by the suface wave but also the one produced by the internal wave. This is different from the case of a uniform fluid. Some numerical examples were given, showing that the effects of stratification on the hydrodynamic characteristics of a large diameter cylinder should be considered when estimating the higher-frequency characteristics of the wave force for a large structure, and the differences of the diffraction force compared with the uniform fluid are remarkable.