波浪中船舶操纵-耐波性预报的双时间尺度法收敛性和最优时间步长  

Convergence and Optimal Time Step of Dual Time-Scale Method for Ship Maneuvering-Seakeeping Prediction in Waves

作　　者：王东军 WANG Dongjun(Bureau Veritas,Shanghai 200011,China)

机构地区：[1]必维船级社(中国)有限公司,上海200011

出　　处：《中国海洋平台》2024年第4期54-67,92,共15页China offshore Platform

摘　　要：针对波浪中船舶操纵性和耐波性相互作用问题,建立一种基于双时间尺度的船舶操纵-耐波性耦合模型的数值预报方法,其中船-桨-舵水动力载荷采用经验公式估算,一阶线性波浪力和二阶波浪漂移力基于三维势流理论进行计算并建立数据库。基于数值方法研究某舰船在波浪中的回转运动,并且详细地分析双时间尺度方法的时间步长收敛性。在此基础上,建立三因素、三水平工况的数值试验算例,研究航速、波浪频率和波高对船舶回转运动影响的本质原因,进一步根据运动特性将波浪中船舶回转运动分为3种典型模式。讨论波浪中船舶回转过程中操纵和耐波性的关键特征参数,提出各种典型工况下双时间尺度法的最优时间步长选取原则。For the ship's maneuverability and seakeeping performance in waves,a numerical prediction method is proposed to study the maneuvering-seakeeping coupling motions based on dual time-scale,in which the ship-propeller-rudder hydrodynamics are estimated by empirical formula and the first order linear wave force and second-order wave drift force are calculated based on the three-dimensional potential flow theory and a database is established.Based on the presented numerical method,the turning motions of a ship in waves are studied and the time-step convergence of the dual time-scale method is discussed in detail.On this basis,the numerical test cases of three-factor and three-level typical conditions are established to study the essential reasons for the influence of ship speed,wave frequency and wave height on the turning motions,and the turning motions are further divided into three typical modes according to the motion characteristics.The key characteristic parameters of ship maneuvering and seakeeping during turning motions in waves are discussed,and the optimal time-step principles of the dual time-scale method of various typical operating conditions are put forward.

关 键 词：双时间尺度方法 船舶操纵性 船舶耐波性 数值收敛性 最优时间步长 

分 类 号：U661.32[交通运输工程—船舶及航道工程]