Hydrodynamic coefficients of generic subsea modules in forced oscillation tests – importance of structural elements

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 : 2023-04-11 DOI:10.1115/1.4062293

M. Prsic, F. Solaas, T. Kristiansen

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Abstract

A systematic study of hydrodynamic coefficients for simplified subsea modules has been performed to support the estimation of the coefficients needed for planning of subsea installation operations. The coefficients are assessed for a nearly two-dimensional test setup. The tests are performed as forced oscillations at various amplitudes and periods, representing the forces on the module lowered through the water column. The importance of each of the main components of the subsea modules – mudmat, protection roof and process equipment of different shapes inside the modules are studied at fully submerged condition. Results for the module elements, generic contents and different combinations of these elements are presented. For the tested modules, damping is generally the dominating hydrodynamic force. However, the presence of the content inside the modules will generally increase the importance of added mass. Estimation of the hydrodynamic coefficients by summation of the coefficients for the individual structure elements generally overestimates the damping, compared to the coefficients measured for the complete modules. For added mass, estimation based on summation gives generally good results.

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强迫振荡试验中通用海底模块的水动力系数——结构元件的重要性

已经对简化海底模块的流体动力学系数进行了系统研究，以支持海底安装操作规划所需系数的估计。这些系数是针对几乎二维的测试设置进行评估的。测试以不同振幅和周期的强迫振荡形式进行，代表通过水柱下降的模块上的力。在完全浸没的条件下，研究了海底模块的每个主要部件的重要性——模块内的泥垫、保护屋顶和不同形状的工艺设备。给出了模块元素、通用内容和这些元素的不同组合的结果。对于测试的模块，阻尼通常是主要的流体动力。然而，模块内内容物的存在通常会增加附加质量的重要性。与整个模块测量的系数相比，通过对单个结构元件的系数求和来估计流体动力学系数通常会高估阻尼。对于附加质量，基于求和的估计通常会给出良好的结果。

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.