基于CFD方法的双体风电交通运维船改造的航速估算

Speed estimation of catamaran wind power transportation VEB based on CFD method

关于船舶改造,在设计阶段快速而又准确地估算航速相当重要。文章介绍针对某双体风电交通运维船的改造,采用数值仿真技术预报其航速。首先使用计算流体力学(CFD)商业软件FLUENT,对船舶在静水中的黏性阻力展开数值计算。然后通过黏性阻力占总阻力的比例,估算船舶的总阻力,绘制推进阻力曲线。从推进阻力曲线与螺旋桨的有效功率的交点即可估算出该船的航速。为了得到高精度黏性阻力计算结果,在船体表面附近网格加密,采用SST k-ω湍流模式,速度与压强耦合采用SIMPLC方法,其它离散采用二阶迎风格式。数值方法预报船舶黏性阻力技术相当成熟,发表的数值预报结果供读者参考。

It is important to estimate speed quickly and accurately during the ship＇s design phase. In this paper, a numerical simulation technique is used to forecast the speed of a catamaran wind power transportation and maintenance ship. Firstly, using computational fluid dynamics software FLUENT, the viscous resistance of ships in still water is numerically calculated. Then, through the ratio of viscous resistance to total resistance, the total resistance of the ship is estimated and the propulsive resistance curve is drawn. The speed of the ship can be estimated from the intersection of the resistance curve with the propeller＇s effective power. In order to obtain high - precision viscous resistance calculation results, the grid near the hull surface is encrypted, using the SST k -ω turbulence model, SIMPLC coupled with velocity and pressure, and the other discrete second - order upwind style. Numerical methods to predict viscous drag ship technology is quite mature and the published numerical prediction results are for readers＂ reference.