波浪中KVLCC2运动与阻力增加的CFD计算及分析

CFD verification and analysis of added resistance and motions of KVLCC2 in head waves

为研究肥大型船舶在波浪中的运动与增阻问题,基于计算流体动力学(computational fluid dynamics,CFD)理论建立了数值波浪水池,并结合重叠网格方法对KVLCC2迎浪航行进行了模拟研究。文中计算了Fn=0.142时KVLCC2船模在不同频率遭遇波作用下的运动和阻力,采用傅里叶级数展开法分析获得垂荡、纵摇运动响应和阻力值,将船模在波浪中航行受到的阻力减去静水航行阻力,获得了不同频率下的阻力增加值,将运动与阻力增加值与相关实验结果比较,吻合良好。通过对Fn=0.142时KVLCC2在波浪增阻成分进行的分析,与相关势流理论计算结果及实验结果对比,研究表明:短波增阻主要由船体绕射贡献,同时表明CFD方法计算船舶在波浪上的运动和增阻的可靠性。

The motions of KVLCC2 advancing at Fn = 0. 142 in head waves have been simulated by implementing a numerical wave tank and an overset mesh method based on computational fluid dynamics （CFD） to study the mo- tions and added resistance of a ship possessing a big block coefficient in waves. The numerical results of heave, pitch, and resistance were analyzed using the Fourier series, and the added resistance due to waves was determined by the resistance of the ship to the waves after subtracting the resistance of the ship in unperturbed water. The re- sults of the computation and the related model test of the added wave resistance were in agreement. Furthermore, the components of added resistance due to different causes were investigated and the results that were calculated u- sing CFD were compared to the results calculated by the strip method and the model test. This indicates that the added resistance of the ship to short-waves was mainly induced by ship diffraction. Further, CFD can be used to accurately calculate the ship motion and the added wave resistance.