方尾船在浅水中兴波的数值研究  

Numerical Study of Square-stern Ship-Wave in Shallow Water

作　　者：吴建康[1] 

机构地区：[1]华中理工大学力学系,武汉市430074

出　　处：《水动力学研究与进展（A辑）》1997年第3期322-330,共9页Chinese Journal of Hydrodynamics

基　　金：国防预研基金资助项目

摘　　要：本文从含移动压力的浅水波方程出发，计算方尾船在浅水中的兴波。船的运动看成对自由水面的压力扰动，直接加到浅水方程组。采用运动网格的有限元法求解浅水波动方程。在船体周围的开边界上使用无反射的边界条件。本文给出三维自由水面波高图、深度平均的水平流速以及方尾船兴波阻力系数、船体沉浮量、纵倾角的数值结果。从物理意义的定性分析来看，数值结果是合理的，计算方法是有效的。计算结果表明，兴波阻力系数、船体沉浮量。This paper employed shallow water equations with moving pressure to calculate water waves generated by a square-stem ship in shallow water. The moving ship is considered as a moving pressure on free surface. The finite element method with moving grids is used to solve the shallow water equations based on wave e-quation model [3]. A non-reflection boundary condition [5] is imposed on open boundaries surrounding the ship 3-D surface elevations, depth-averaged horizontal velocities are presented. The numerical solutions are physically reasonable. It is found that wave resistant coefficients, drift change and pitch angle vary rapidly in neighborhood of critical flow ( Fh = u/ gh ≈ 0. 9 - 1. 1 ). The numerical results also indicate that wave resistant coefficients , drift change and pitch angle of square-stem ship are larger than of sharp-stern ship with the same hull structure at same speed.

关 键 词：方尾船 浅水波方程 有限元 船舶流体力学 

分 类 号：U661.1[交通运输工程—船舶及航道工程]