高速排水型船的运动性能预报

Motion characteristics of fast displacement vessels

给出一种基于高速细长体理论的预报高速排水型船在波浪上运动性能的数值方法。在高速细长体理论的定解条件中 ,自由面条件是三维的 ,而控制方程和物面条件则是二维的。采用时域自由面 Green函数将定解问题转化为物面上的积分方程 ,进而求解水动力系数和船舶运动方程。对NPL 系列单体船型的运动性能作了理论预报 ,并与实验结果和用切片法的理论预报结果作了比较。结果表明 ,高速细长体理论的预报结果与试验结果更为接近 ,而切片理论由于受到纯二维假定的限制 ,在高航速情况下 ,预报精度较差。

A numerical method is presented for predicting the motion characteristics of high speed displacement vessels. The method is based on a high speed slender body theory, 2.5 D theory, where the free surface condition is 3 D, but the control equation and body surface condition are 2 D. The transient free surface Green function was used to formulate the integral equation on the body surface. The numerical predictions were compared with experiment results using a mono hull NPL ship, as well as theoretical results by the strip method. The results show that the method can satisfactorily predict the motion response characteristics for high speed displacement vessels.