CFD-Based Simulations of Hydrodynamic Behaviors of a Floating Barge Near Shore

Y. Teng, Jaime HuiChoo Tan
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Abstract

This paper presents Computational Fluid Dynamics (CFD)-based simulations of the hydrodynamic behaviors of a floating barge in shallow waters on an inclined seabed near shore. The hull hydrodynamic behaviors with respect to water depth are quantified by evaluation of the hydrodynamic coefficients, i.e., added mass, viscous damping coefficients, and current drag coefficients, which are required for the prediction of hull motion responses and mooring loads of the barge. CFD simulations are performed to predict the hull hydrodynamic coefficients with consideration of the actual seabed conditions, including water depth and varying bathymetry. Added mass and viscous damping coefficients are calculated using forced harmonic oscillations, while current drag coefficient is obtained using steady current flow simulation. These hydrodynamic coefficients are calculated for three of the six degrees of freedom (DOFs), i.e., surge, sway, and yaw of the hull. By considering three different nearshore water depths with a flat seabed and two inclined seabeds, the hull added mass, viscous damping, and current drag coefficients are quantified and compared against the coefficients in deepwater conditions. The hydrodynamic coefficients are found to be significantly affected by shallow water depths. Overall trends show exponential increase of added mass and viscous damping coefficients as water depth reduces. There is a further linear increase in the coefficients when the seabed bathymetry changes from flat to inclined, particularly when the water depth to hull draft ratio is less than 4.50. Similarly, current drag coefficients increase with decreasing water depths for flat seabed conditions, while for inclined seabed conditions, they may increase or decrease depending on the directions with respect to the shore and the current heading. This paper demonstrates the efficiency of CFD simulations in predicting a floating barge’s hydrodynamic behaviors in shallow water conditions, including varying nearshore bathymetry and viscous effects. The CFD simulation methodologies presented may be extended for the hydrodynamic behavior assessments of other nearshore floating structures such as Floating Offshore Liquefied Gas Terminals (FLGTs), Floating Storage and Regasification Units (FSRUs), and floating wind turbine structures.
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基于cfd的近海浮船水动力特性模拟
本文采用计算流体力学(CFD)方法对近海倾斜海床浅海浮式驳船的水动力特性进行了模拟。通过计算水动力系数,即附加质量、粘性阻尼系数和当前阻力系数,来量化船体随水深的水动力行为,这些水动力系数是预测船体运动响应和驳船系泊载荷所必需的。考虑到实际海底条件,包括水深和变化的水深,进行CFD模拟来预测船体水动力系数。附加质量和粘性阻尼系数采用强迫谐波振荡计算,电流阻力系数采用稳态流模拟计算。这些水动力系数计算了六个自由度(dfs)中的三个,即船体的浪涌、摇摆和偏航。通过考虑三种不同的近岸水深,一个平坦的海床和两个倾斜的海床,船体的附加质量、粘性阻尼和电流阻力系数被量化,并与深水条件下的系数进行了比较。水动力系数受浅水深的影响较大。总体趋势表明,随着水深的减小,附加质量和粘性阻尼系数呈指数增长。当海底水深由平向斜变化时,特别是水深与船体吃水比小于4.50时,各系数进一步呈线性增加。同样,在平坦海床条件下,水流阻力系数随水深的减小而增大,而在倾斜海床条件下,水流阻力系数随相对于海岸和水流航向的方向而增大或减小。本文证明了CFD模拟在预测浮式驳船在浅水条件下的水动力行为方面的有效性,包括变化的近岸水深和粘性效应。所提出的CFD模拟方法可以扩展到其他近岸浮式结构的水动力行为评估,如浮式海上液化天然气终端(FLGTs)、浮式储存和再气化装置(fsru)和浮式风力涡轮机结构。
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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