Abstract The paper presents the numerical studies of seakeeping behavior for a high-speed catamaran with stern flap advancing in long crest head wave. Both model-scale and full-scale simulations have been carried out in sea state 6 using unsteady Reynolds-averaged Navier-Stokes (URANS) solver. Uncertainty analyses were performed to verify the accuracy of the numerical solver. Model tests were conducted for the catamaran including resistance tests in calm water and seakeeping tests in regular waves to validate simulation results. The comparisons between simulation results and experimental results show good agreement. Seakeeping behaviors of models with/without stern flaps were predicted for the comparison and evaluation. Model-scale simulation results indicate that using stern flap could reduce catamaran's total resistance and the effects on heave and pitch motions are obvious in sea state 6. The installation of stern flap shows significant effect on the reduction of vertical acceleration's amplitudes, especially for reducing the occurrence of slamming impact due to the effective control of model's trim angle. Full-scale simulations have also been conducted and compared with results at model scale. Results show that effects of stern flap on heave and pitch motions are the same for both model-scale and full-scale catamaran. Residuary resistance coefficients on full-scale catamarans with/without stern flap are almost the same with model-scale simulations.

中文翻译：

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CFD 预测长波峰首波双体船耐波性能的尾襟翼效应

摘要 本文介绍了高速双体船艉襟翼在长波峰前行时的耐波性能数值研究。使用非定常雷诺平均纳维-斯托克斯 (URANS) 求解器在海况 6 下进行了模型尺度和全尺度模拟。进行了不确定性分析以验证数值求解器的准确性。对双体船进行了模型测试，包括静水阻力测试和常规波浪中的耐波测试，以验证模拟结果。仿真结果与实验结果的比较表明，具有良好的一致性。预测了带有/不带有尾襟翼的模型的耐波性能以进行比较和评估。模型尺度模拟结果表明，使用艉襟翼可以减少双体船 s 总阻力以及对升沉和纵摇运动的影响在海况下明显 6. 尾襟翼的安装对降低垂直加速度的幅值有显着效果，特别是由于模型纵倾的有效控制，减少了砰击撞击的发生角度。还进行了全尺寸模拟，并与模型规模的结果进行了比较。结果表明，对于模型尺度和全尺度双体船，艉襟翼对升沉和俯仰运动的影响是相同的。带/不带尾襟翼的全尺寸双体船的残余阻力系数与模型规模的模拟几乎相同。特别是有效控制模型的纵倾角，减少砰击冲击的发生。还进行了全尺寸模拟，并与模型规模的结果进行了比较。结果表明，对于模型尺度和全尺度双体船，艉襟翼对升沉和俯仰运动的影响是相同的。带/不带尾襟翼的全尺寸双体船的残余阻力系数与模型规模的模拟几乎相同。特别是有效控制模型的纵倾角，减少砰击冲击的发生。还进行了全尺寸模拟，并与模型规模的结果进行了比较。结果表明，对于模型尺度和全尺度双体船，艉襟翼对升沉和俯仰运动的影响是相同的。带/不带尾襟翼的全尺寸双体船的残余阻力系数与模型规模的模拟几乎相同。