基于多层面改进多域法的航行船舶时域水动力分析  

Time-domain hydrodynamic analysis of ship with forward speed based on multi-domain method with multi-level improvement

作　　者：周文俊 徐萍[1] 周华伟 张祥瑞[1] ZHOU Wen-jun;XU Ping;ZHOU Hua-wei;ZHANG Xiang-rui(Marine Design&Research Institute of China,Shanghai 200011,China)

机构地区：[1]中国船舶及海洋工程设计研究院,上海200011

出　　处：《船舶力学》2023年第4期481-497,共17页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(51579147)。

摘　　要：针对航行船舶三维时域水动力分析问题,本文采用多域高阶边界元法(MDHOBEM, Multi-Domain Higher Order Boundary Element Method)开展研究,通过假设控制面,将计算域分为内域和外域两部分,内域采用Rankine面元法,外域使用自由面格林函数法,内外域联立求解。从内域、外域、波浪激励三个层面改进多域法的精度、计算效率,以适应不同工况需求。内域重新推导非线性边界条件,考虑入射波对绕辐射问题计算的影响,提高大幅波浪中运动计算精度;外域采用垂向积分形式自由面格林函数,提高格林函数积分计算的收敛性、稳定性及计算效率;波浪激励采用高阶谱(HOS, High Order Spectral)方法生成演化的波场,考虑波浪自身的非线性,提高对非线性现象的捕捉和模拟能力。以C11船为对象,研究内域非线性改进对船舶大幅运动计算精度的提高;以S175集装箱船为对象,验证外域垂向积分对运动及波阻增加计算效率和稳定性的提高;对比S175在线性波场和非线性波场中的运动,论证考虑非线性波场对运动计算的影响;以某内倾船为对象,研究不同层次改进对参数横摇现象捕捉的影响,验证非线性波浪激励对多域法非线性现象捕捉能力的提升;整体上形成不同层面改进多域法,为不同工况下时域水动力分析提供理论和程序支撑。Aiming at time-domain hydrodynamic analysis of a ship with forward speed,the multi-domain higher order boundary element method(MDHOBEM)was established.With an imaginary control surface,the computation domain was divided into the inner and outer domain.In the inner domain,the Rankine panel method was applied while in the outer domain the free surface Green’s function was applied.The initial boundary problems in the inner and outer domains were solved together.To satisfy different working condi⁃tions,improvements were made in the inner domain,outer domain and wave excitations for the accuracy and computation efficiency of MDHOBEM.In the inner domain,the nonlinear boundary conditions were re-de⁃rived by considering influence of incident waves on the diffraction-radiation problem,which improves the ac⁃curacy of MDHOBEM in motion calculation of large-amplitude waves.In the outer domain,the vertical inte⁃gral of free surface Green’s function was proposed to improve the convergence,stability and efficiency of the panel integral of Green’s function.In the wave excitations,the high order spectral(HOS)method was adopt⁃ed to simulate incident wave fields,which considers the nonlinearity of waves field itself and improves the ability of MDHOBEM in capturing nonlinear phenomenon.The motions of C11 container ship in large ampli⁃tude waves were calculated to validate the improvement of accuracy due to the inner aspect improvement.Added wave resistance of S175 ship was studied to validate the improvement in efficiency and stability due to the outer aspect improvement.The motions of S175 in linear/nonlinear waves were calculated to validate the influence of nonlinear incident wave on ship motions.The parametric roll of one tumble home hull was studied to validate the improvement of MDHOBEM in capturing nonlinear phenomenon due to wave excita⁃tion improvement.The multi-domain method with multi-level improvement was established to support time domain hydrodynamic analysis for different working conditions with ma

关 键 词：三维时域 多域法 非线性 垂向积分 高阶谱 

分 类 号：TV131.2[水利工程—水力学及河流动力学]