An improved method for predicting roll damping and excessive acceleration for a ship with moonpool based on CFD method

IF 1.3 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme Pub Date : 2023-01-23 DOI:10.1115/1.4056737

F. Duan, N. Ma, X. Gu, Yao-hua Zhou

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引用次数: 0

Abstract

Excessive acceleration is one of the stability failure modes involving large roll motion of ships. The overset method is applied to solve the six degrees-of-freedom motion of the ship with moonpool in beam waves. Based on computational fluid dynamics (CFD) method, the improved method of considering the roll damping of square moonpool are proposed. The improved method of considering moonpool damping is used in vulnerability assessment for excessive acceleration. The comparative analysis of the Level 1 and Level 2 vulnerability assessment of the excessive acceleration of a ship with moonpool is completed. The influence of moonpool on the vulnerability assessment of excessive acceleration is studied by comparing with the model test results. The results show that the main factor affecting the estimation accuracy of lateral acceleration of the ship is the accuracy of roll amplitude calculation. The existence of moonpool will reduce the roll damping coefficient of the ship. The improved methods proposed in this paper can effectively improve the estimation of lateral acceleration of ships with moonpool in the Level 1 vulnerability criteria and increase the safety margin in the Level 2 vulnerability assessment. In the direct stability assessment, the CFD method can simulate the large-amplitude roll motion of the ship with moonpool and bilge keels, and can capture the strong nonlinear phenomena

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基于CFD方法的月池船舶横摇阻尼和超加速度预测改进方法

过大加速度是船舶大横摇稳定性失效模式之一。应用overset方法求解了带有月池的船舶在梁波中的六自由度运动。基于计算流体动力学（CFD）方法，提出了考虑方形月池滚动阻尼的改进方法。将改进的考虑月池阻尼的方法用于过加速度的脆弱性评估。完成了月球池船舶过加速一级和二级易损性评估的对比分析。通过与模型试验结果的比较，研究了月池对过加速度易损性评估的影响。结果表明，影响船舶横向加速度估算精度的主要因素是横摇幅度计算的准确性。月池的存在会降低船舶的横摇阻尼系数。本文提出的改进方法可以有效地提高一级脆弱性标准中月球池船舶横向加速度的估计，并提高二级脆弱性评估中的安全裕度。在直接稳定性评估中，CFD方法可以模拟带有月池和舱底龙骨的船舶的大幅度滚转运动，并可以捕捉到强烈的非线性现象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Offshore Mechanics and Arctic Engineering-Transactions of the Asme 工程技术-工程：大洋

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Offshore Mechanics and Arctic Engineering is an international resource for original peer-reviewed research that advances the state of knowledge on all aspects of analysis, design, and technology development in ocean, offshore, arctic, and related fields. Its main goals are to provide a forum for timely and in-depth exchanges of scientific and technical information among researchers and engineers. It emphasizes fundamental research and development studies as well as review articles that offer either retrospective perspectives on well-established topics or exposures to innovative or novel developments. Case histories are not encouraged. The journal also documents significant developments in related fields and major accomplishments of renowned scientists by programming themed issues to record such events. Scope: Offshore Mechanics, Drilling Technology, Fixed and Floating Production Systems; Ocean Engineering, Hydrodynamics, and Ship Motions; Ocean Climate Statistics, Storms, Extremes, and Hurricanes; Structural Mechanics; Safety, Reliability, Risk Assessment, and Uncertainty Quantification; Riser Mechanics, Cable and Mooring Dynamics, Pipeline and Subsea Technology; Materials Engineering, Fatigue, Fracture, Welding Technology, Non-destructive Testing, Inspection Technologies, Corrosion Protection and Control; Fluid-structure Interaction, Computational Fluid Dynamics, Flow and Vortex-Induced Vibrations; Marine and Offshore Geotechnics, Soil Mechanics, Soil-pipeline Interaction; Ocean Renewable Energy; Ocean Space Utilization and Aquaculture Engineering; Petroleum Technology; Polar and Arctic Science and Technology, Ice Mechanics, Arctic Drilling and Exploration, Arctic Structures, Ice-structure and Ship Interaction, Permafrost Engineering, Arctic and Thermal Design.