基于SHIPFLOW MOTIONS的测量船耐波性研究

Studying Seakeeping Performance of a Surveying Vessel Using SHIPFLOW MOTIONS

以一艘测量船为研究对象,采用基于势流理论的商业软件SHIPFLOW中的MOTIONS模块对其进行耐波性数值仿真,研究其在波浪中的运动和阻力特性。利用三维时域完全非线性边界元方法计算船舶在迎浪规则波中的运动特性,并将数值计算结果与模型试验结果相对比,结果表明:船舶在波浪中的升沉和纵摇运动数值计算结果与模型试验结果较为吻合;船舶在波浪中的阻力增加RAO值计算结果与模型试验结果的最大偏差约为13%;波浪增阻数值计算结果的精度明显高于基于三维频域线性势流理论的计算结果。此外,直接采用SHIPFLOW软件模拟该船在不规则波中的运动,验证其非线性问题处理能力,结果发现模拟计算结果与试验结果的偏差约为7%,证明采用该方法解决船体周围复杂流场问题可行。

The commercial software SHIPFLOW MOTIONS based on potential flow theory is used to simulate the motion of a surveying vessel in waves.The physical characteristics of ship motion in regular waves are calculated using three-dimensional,time-domain,and fully nonlinear boundary element methods,The numerical calculation results are examined against the model test results.The research shows that the numerical calculation results of heave and pitch motion fit well with the model test results.For ship's resistance increase in waves,the maximum deviation between the RAO numerical calculation results and the model test results is about 13%,which is significantly more accurate than that the three-dimensional frequency-domain linear potential flow theory can produce.In addition,to verify the nonlinear problem-solving ability of the software,it is directly used to simulate the motion of the ship in irregular waves.The results shows that the deviation between the wave drag calculation results and the experimental results is about 7%,which implies that using the potential flow method to solve problems of ships in complex flow field is feasible.