Part 2 reports the validation, local force and local flow study results for the free-running added power simulations whose conditions are the same as the self-propulsion test except for the increased propeller rotational speed and the presence of wave. When targeting the same mean Froude number in the wave condition, the propeller requires the increased propeller rotational speed for the operation at the low advance ratio due to the added resistance. The test is performed at five different wavelengths in head waves and four different headings in the oblique waves. For the validation study, the time series of the validation variables is decomposed with discrete Fourier transform to extract the harmonic values. Validation variables are global parameters, including motions, propeller thrust, and torque coefficients, added power variables, and self-propulsion factors which show reasonable agreement against the experiment results and produces a similar error from the self-propulsion simulation. The local force study shows that the added resistance mostly appears at the bow due to the bow plunging during the short head wave and resonance condition. The contributions of the gravitational force and the buoyant force are found to increase as the stern motion exceeds the bow motion during the long head wave condition. The oscillation of the propeller performances shows correlation with the first harmonic amplitude of the propeller inflow. Heave, pitch, and roll decay tests are performed prior to the main test to assess the natural frequencies of the ship. Same as Part 1, a discretized propeller is used.

第 2 部分报告了自由运行附加功率模拟的验证、局部力和局部流动研究结果，其条件与自航试验相同，但螺旋桨转速增加和存在波浪。当在波浪条件下以相同的平均弗劳德数为目标时，由于增加的阻力，螺旋桨需要增加螺旋桨转速以在低提前比下运行。该测试在首波中的五种不同波长和斜波中的四种不同航向下进行。对于验证研究，验证变量的时间序列用离散傅立叶变换分解以提取谐波值。验证变量是全局参数，包括运动、螺旋桨推力和扭矩系数、添加的功率变量、和自推进因素，它们与实验结果显示出合理的一致性，并从自推进模拟中产生类似的误差。局部力研究表明，由于在短头波和共振条件下船首下沉，增加的阻力主要出现在船首。发现重力和浮力的贡献随着船尾运动超过船首运动而在长头浪条件下增加。螺旋桨性能的振荡显示出与螺旋桨流入的一次谐波幅度相关。在主要测试之前进行升沉、纵摇和横摇衰减测试，以评估船舶的固有频率。与第 1 部分相同，使用了离散螺旋桨。