竖直平面波动问题的水动力系数

本文阐述了一种用以计算深水中竖直平面波动问题水动力系数的数值方法.其过程是,以格林公式为基础导出了波源法,应用该方法计算了受线性波动作用时的半圆及矩形截面的物体,并将计算结果与沃兹(Vugts)早期的试验结果进行了比较.     

Hydrodynamic coefficients for vertical plane wave motion problems

In this paper a numerical method for calculating the hydro-dynamic coefficients for vertical plane wave motion problems in deep water is described.This procedure is developed by using the wave source method based on Green‘s theorem.The applications of the method to the cases of semi-circular and rectangular section bodies subjected to linear waves are pre-sented here,and the computed results are compared with the earlier experimental data of Vugts.     

WAVE AND EARTHQUAKE EFFECTS ON AXISYMMETRIC OFFSHORE STRUCTURES

Vertical axisymmetric structures have found a variety of applications in offshore engineering, including oil storage tanks,production platforms and so on. The present paper describes an efficient calculation procedure for determining the interaction of such structures with the surrounding ocean. In particular, numerical calculations are explicated for: -wave forces and runup for a fixed structure, -added-mass and damping coefficients for an oscillating structure, -earthquake loading in terms of base shear and overturning moment, -motions of a floating structure. The approach used is based on a boundary element method involving an axisymmetric Green's function, and exploits the structure's axisymmetry to provide a highly efficient computational procedure suitable for carrying out on a desk-top computer. Results are presented for surface-piercing conical structuresunder various loading conditions.     

海浪、地震对于轴对称海工建筑物的作用

当今海洋工程中广泛采用各种竖直轴对称结构,诸如贮油罐、采油平台等等。本文论述一种计算上述结构物与其周围的海洋相互作用的极其有效的计算方法,着重讨论如下几个问题的数值计算:1.作用在固定建筑物上的波浪荷载和爬高;2.作用在浮式建筑物上的附加质量、阻尼系数以及激荡力(扰动力);3.因地震荷载作用而产生的基面剪切力和转动力矩;4.浮式建筑物在波浪作用下的运动状态。本文所述方法是一种以轴对称格林函数为基础的边界单元法,并利用结构物本身的轴对称性提出了适用于小型计算机上进行快速有效计算的计算程序。最后,作者给出了不同荷载对于伸出水面的截圆锥式建筑物的作用的计算结果。