小水线面双体船耐波性能CFD不确定度分析

基于ITTC推荐的CFD不确定度分析规程,开展基于RANS方程的小水线面双体船(SWATH)波浪中纵向运动计算结果的不确定度分析。分别验证计算模型的网格收敛性和时间步长的收敛性,发现相比于网格的疏密,该数值求解模型对于时间步长更为敏感。通过与试验数据进行对比,计算结果基本得到确认,并由此建立了顶浪规则波中SWATH船纵向运动数值计算结果的确认等级。在此基础上,进一步开展了该SWATH船在2个波高多个波长条件下的运动求解,计算结果均与试验结果吻合较好,说明所采用的数值计算模型对于求解SWATH船在波浪中的运动问题具有较好的适用性和可靠性。

Uncertainty analysis in CFD for SWATH motions in regular head waves

Based on procedures for uncertainty analysis in CFD recommended by ITTC, the results of Small Waterplane Area Twin Hull (SWATH) ship longitudinal motions in regular head waves solved by RANS code are verified and validated. The verification both for grid convergence and time step convergence is investigated respectively. Finding shows that the numerical solving model is more sensitive to time step size than that of grid. According to the experimental data, numerical results are validated mostly. And then the levels of verification and validation for numerical results of SWATH ship longitudinal motions in regular head waves are established. Further, SWATH ship motions in conditions of two different wave heights as well as various wavelengths are carried out. The good agreement with experimental data showed by numerical results further proved that the proposed approach is effective and reliable to solve issues of SWATH ship motion in waves.