小水线面双体船操纵性数值预报方法研究

文章基于粘性流体理论,采用CFD技术,通过对双体船变漂角旋臂运动的模拟,得到代表小水线面双体船舶操纵性能的水动力导数。利用MMG模型,对小水线面双体船的操纵性能进行初步预报。根据变漂角旋臂运动的数值模拟,既可从中得到仅仅与漂角和角速度有关的水动力导数,也可获得包括高阶导数和耦合导数在内的操纵性运动水动力导数。文章在保留三阶水动力导数的情况下,将代入高阶耦合水动力导数的操纵运动方程所绘制的回转圈与不代入高阶耦合水动力导数的回转圈进行对比,体现了高阶耦合水动力导数对于小水线面双体船操纵性预报的重要性,并以某双体船型为例,对其操纵性能进行预报。

Numerical prediction of maneuverability of SWATH ship

The hydrodynamic derivatives representing maneuverability are investigated through the simulation of the rotating arm motions with the varied drift angles for SWATH ships by CFD technology based on the viscous lfuid theory. The MMG model is used to predict the maneuverability of the SWATH ship. The rotating arm motions with the varied drift angles are numerically simulated to predict the hydrodynamic derivatives only associated with the drift angle and angular velocity and the higher order and the coupled hydrodynamic derivatives, resulting in the improvement of the maneuverability of the SWATH ship during the design process. By keeping the third order hydrodynamic derivatives in the maneuverability motion equation, the rotating circle is calculated and compared with the one obtained from the equation without the higher order coupling hydrodynamic derivatives. It reveals the importance of the higher order coupling hydrodynamic derivatives for the prediction of the maneuverability of the SWATH ship. The maneuverability of a SWATH ship is ifnally predicted.