摘要
给出一种基于高速细长体理论的预报排水型双体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,所以高速细长体理论常被称为二维半理论。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系列双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。比较结果表明,高速细长体理论的预报结果与试验结果相当接近,而切片理论运用于双体船时,由于受到纯二维假定的限制,在某些离散频率出现水动力干扰现象,导致运动预报偏离试验结果。
A numerical method is presented for predicting the motion characteristics of high-speed displacement catamarans in waves. The method is based on the high-speed slender body theory, so called 2-1/2D theory, where the free-surface condition is 3D but the control equation and body surface condition are 2D. The transient free-surface Green function is used to formulate the integral equation on the body surface. The numerical predictions are compared with experimental results of a twin-hull NPL ship, as well as theoretical results by the strip method. The results show that the present method can satisfactorily predict the motion response characteristic for high-speed displacement catamarans, but the strip theory cannot give rational result, because hydrodynamic interference phenomena would happen at some discrete frequencies when applying the strip theory to the calculation of hydrodynamic coefficients of multiple cylinders.
出处
《工程力学》
EI
CSCD
北大核心
2002年第2期138-142,共5页
Engineering Mechanics
基金
教育部优秀博士学位论文作者专项基金(199927)
