粘性等效船舶横摇运动降阶预报方法  

Reduced order method for ship roll motion prediction based on viscosity equivalence

作　　者：姜宜辰 宗鸿运 刘世杰 孙哲 张桂勇[1,3] JIANG Yichen;ZONG Hongyun;LIU Shijie;SUN Zhe;ZHANG Guiyong(School of Naval Architecture,Dalian University of Technology,Dalian 116024,China;Ningbo Ocean Shipping Company Limited,Ningbo 315040,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学船舶工程学院,大连辽宁116024 [2]宁波远洋运输股份有限公司,浙江宁波315040 [3]大连理工大学工业装备与结构分析国家重点实验室,大连辽宁116024

出　　处：《哈尔滨工程大学学报》2023年第1期109-116,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52061135107);辽宁省兴辽英才计划高水平创新创业团队项目(XLYC1908027);中央高校基本科研业务费专项资金项目(DUT20TD108;DUT20LAB308)。

摘　　要：针对船舶耐波性中的经典横摇问题,本文提出一种针对横摇运动预报的粘性等效降阶方法。在该方法计算框架中,首先采用粘流模型和无粘模型分别模拟船体的强迫放大运动,预报不同运动幅度下的水动力力矩。其次,应用能量等效法获取船舶横摇阻尼随KC数变化的修正函数。最后,在横摇运动响应预报中,基于欧拉方程求解无粘流体,应用获取的阻尼修正函数,对横摇阻尼进行实时修正,以提高预报精度。为验证该方法的有效性,分别采用VEROM模型和RANS粘性模型对典型二维船体中段的横摇响应进行预报,对比结果表明:VEROM模型与RANS模型预报精度相当,但前者的计算时间可缩减到RANS模型的5%。Aiming at the classical roll problem in the seakeeping performance of a ship,this paper presents a viscosity-equivalent reduced order method(VEROM)for roll motion prediction.This method identifies the nonlinear roll damping characteristics based on a viscous flow and nonviscous models solving the N-S and Euler equations,respectively.In this method,the hydrodynamic moment under different motion amplitudes is predicted from a new type of forced motion whose amplitude increases with time.First,the viscous flow and inviscid models are used to simulate the forced amplification motion of the hull and predict the hydrodynamic moment under different motion amplitudes,respectively.Furthermore,the energy equivalent method is used to obtain the correction function of ship rolling damping with KC number.In the prediction of rolling motion response,the inviscid fluid is solved on the basis of the Euler equation,and the rolling damping is corrected in real time by using the obtained damping correction function to improve the prediction accuracy.VEROM and RANS viscous models are used to predict the roll response of the midship section of a typical hull in waves to verify the effectiveness of the proposed method.Comparison results show that the forecast accuracy of the VEROM model is comparable to that of the RANS model.However,the computational efficiency can reach more than 20 times of the RANS model.

关 键 词：船舶横摇 非线性阻尼 降阶方法 粘性修正 强迫放大 水动力力矩 能量等效法 实时修正 

分 类 号：U661.1[交通运输工程—船舶及航道工程]