船行波对水中直立圆柱作用的数值模拟

针对船行波对水中直立圆柱的作用进行了数值计算。主要包括船行波的计算以及波浪对水中直立圆柱的作用。对于船行波的计算应用薄船理论和Noblesse给出的格林函数的简化形式,计算出Wigley船型在静水中匀速直线运动产生的船行波的远场解。以该船行波为入射波,应用Rankine源方法对船行波对水中直立圆柱的作用力及力矩进行了数值计算,得出了船只经过圆柱周围时圆柱的受力情况,对计算结果进行了定性的分析。

A numerical study of the action of ship-generating waves on a surface-piercing vertical cylinder

In this paper,the problem that a surface-piercing vertical cylinder subjected to the waves caused by a nearby moving ship is studied. The problem is composed of two parts: the waves generated by the moving ship(ship wave problem) and the waves acting on the cylinder(wave action on the cylinder problem). The ship wave problem is solved by use of the thin-ship theory,in which the Green function given by Noblesse is employed.The numerical results show that the non-oscillatory term in the ship generating waves can be neglected far away from the ship.In the second part of the paper,a Rankine source method is developed to calculate the action of ship-generating waves on the vertical cylinder in finite depth water.Using the ship-generating waves as the incident wave,the diffraction wave produced by the cylinder is estimated using the Rankine source method.Forces and moments acting on the cylinder are estimated from the diffraction wave.Analysis shows that the results have appropriately revealed the expected behaviors of such a problem.