三维时域自由面格林函数法的时域绕射力计算研究  

Diffraction force calculation using three-dimensional time-domain Green function method

作　　者：鲁江[1] 张楠[1] 张新曙[2] 顾民[1] LU Jiang;ZHANG Nan;ZHANG Xin-shu;GU Min(China Ship Scientific Research Center,Wuxi 214082,China;State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《船舶力学》2024年第7期981-994,共14页Journal of Ship Mechanics

基　　金：工信部高技术船舶项目(2017(614))。

摘　　要：船舶工业CAE软件势流求解器的开发对势流计算方法的可靠性提出要求,本文针对三维时域面元法开展绕射力计算研究。首先引入三维时域自由面格林函数,其瞬时项的求解采用Hess&Smith方法,记忆项的求解采用Beck团队的方法;其次,推导出全浪向绕射力脉冲函数法编程所用的数学表达式;然后,采用分布源模型求解源强和速度势,并采用压力直接积分法求出时域绕射力;最后,针对Wigley I船型开展绕射力和FK力计算,并与公开的试验和计算结果进行对比,验证本文方法的可靠性。本文方法和代码可用于船舶工业CAE软件势流求解器和波浪中船舶非线性失稳运动预报。The development of the potential flow solver for the CAE software of a ship requests a reliable method to solve the potential flow.The numerical method of the diffraction force with a three-dimensional time-domain panel method was studied.With a three-dimensional time-domain Green function introduced,its Rankine part was calculated by Hess&Smith’s method while its free-surface memory part was calculat⁃ed by the method of Beck team from the University of Michigan,followed by the derivation of the diffraction impulse function in the mathematical expressions for making the program.Then the source method was used to calculate the source and the diffraction potential,and the diffraction potential force was obtained by inte⁃grating the pressure around the floating body.Finally,the diffraction force and Froude-Krylov force were cal⁃culated with the Wigley I ship.The verification was carried out by comparing the results with the published experimental and numerical results.The method and the code in this paper are reliable for developing the po⁃tential flow solver of the CAE software and predicting the nonlinear stability failure models in waves.

关 键 词：三维时域面元法 三维时域格林函数 绕射力 船舶CAE自主软件 

分 类 号：O353.2[理学—流体力学]