两类格林函数在波浪中航行船舶水动力预报中的差异分析

Comparison of the hydrodynamic analysis of a ship advancing in waves using 3D pulsating source and translating-pulsating source

为比较三维脉动源(3DP)和三维移动脉动源(3DTP)在波浪中航行船舶水动力预报中的差异,文章分别以这两种源作为积分内核,采用边界元法中的混合分布源法直接求解WigleyⅢ、Ser.60(CN=0.7)及某深V船三种典型船舶在规则波中航行时的辐射势和绕射势,进而求得船体的水动力系数、波浪干扰力及运动响应。所得数值结果和模型试验结果比较表明采用3DTP作为内核预报的结果与试验结果吻合良好,其预报精度高于3DP,是一种具有较高精度的船舶耐波性预报工具。

Predicted hydrodynamic quantities such as hydrodynamic coefficients, wave exciting forces and ship motions are carried out for three typical hulls （a Wigley 111 hull, a Series 60 hull and a Deep-V hull） travelling in regular waves by using direct potential formulation which employs two different Green＇s func- three-dimentional pulsating source （3DP） and three-dimentional translating-pulsating sourece （3DTP）. Numerical resuhs are also compared with experimental data. This extensive comparison illustrates that the numerical results investigated by the 3DTP provide good qualitative agreement with the available experi- mental data and more accurate than that of the 3DP. This provides further confidence that the 3DTP is suit- able for analyzing the motions and loads experienced by a vessel traveling with forward speed in waves.