【作者】 刘李为； 陈美霞； 王爽； 何涛； 张志国； 王先洲；

【Author】 LIU Li-wei;CHEN Mei-xia;WANG Shuang;HE Tao;ZHANG Zhi-guo;WANG Xian-zhou;School of Naval Architecture & Ocean Engineering,Huazhong University of Science and Technology;

【机构】 华中科技大学船舶与海洋工程学院；

【摘要】 第二代完整稳性衡准基于不同的稳性失效模式,对纯稳性丧失、参数横摇、骑浪/横甩、瘫船和过度加速度等5种失效模式进行跟踪、分析和研究,采用先进的船舶水动力技术,解决参数横摇、纯稳性丧失、瘫船稳性、骑浪/横甩和过度加速度的薄弱性衡准和直接评估中的难点,建立和完善完整稳性的模型测试技术、数值计算技术和评估验证技术,开发完整稳性主要失效模式的评估方法和稳性丧失直接评估软件。本文运用自研CFD软件HUST-Ship,预报ONRT模型在迎浪规则波中的参数横摇现象,并对数值预报结果进行评估。HUST-Ship求解器基于黏性流对非稳态的RANS方程与船体6自由度运动方程进行耦合求解,同时通过有限差分法对方程离散。在对ONRT模型迎浪规则波中参数化横摇运动的数值预报过程中,考虑模型的横摇、纵摇与垂荡运动,并通过对数值预报方法进行系统的验证与确认工作来评估该数值模拟的预报误差与不确定度。验证工作包括网格与时间步长的收敛性研究与数值不确定度的分析,确认工作包括数值预报结果与模型试验结果的比较与对模型不确定度的评估,其中模型试验结果来源于INSEAN水池。结果表示运用HUST-Ship求解器能够对ONRT模型在迎浪规则波中的参数横摇运动进行准确预报,且网格和时间步长收敛性良好。同时,数值预报结果的误差小于2%。更多还原

【Abstract】 The second-generation intact stability criteria are proposed by IMO(International Maritime Organization),aimed to research five typical stability failure modes including pure loss of stability,parametric rolling,surf-riding/broaching,dead ship condition and excessive acceleration.For the criteria,it is necessary to develop the method for direct assessment of such five dynamic stability failure modes.This paper presents an assessment of numerical prediction of parametric rolling phenomenon of ONR Tumblehome model in regular head waves.An inhouse viscous CFD(computational fluid dynamics) code,HUST-Ship,has been used for the numerical study.URANS(unsteady Reynolds averaged Navier-Stokes) equations coupled with 3 DOF(three degrees of freedom) rigid-body motion equations are solved and discretized by finite difference method with structured grids.Systematic verification and validation works have been carried out to estimate the numerical and modeling errors and uncertainties for rolling motion of ONR Tumblehome model in regular head wave.Heave,pitch,and roll motions have been considered in the numerical simulation.The verification work includes grid and time-step convergence study.In validation work,the numerical results have been compared with the experimental data from INSEAN,in which the experimental tests show evident parametric rolling for model without bilge keels.Results demonstrate that the inhouse CFD code HUST-Ship could simulate the parametric rolling motion of model.It shows proper grid and time-step convergence behavior.What’s more,the prediction difference of ship motion compared with experimental result is less than 2%.As a result,HUST-Ship could achieve good accuracy for the prediction of parametric rolling phenomenon.更多还原