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首页> 外文会议>25th International Conference on Offshore Mechanics and Arctic Engineering 2006(OMAE2006) vol.4 >HYDRODYNAMIC WAVE LOADING ON OFFSHORE STRUCTURES SIMULATED BY A TWO-PHASE FLOW MODEL
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HYDRODYNAMIC WAVE LOADING ON OFFSHORE STRUCTURES SIMULATED BY A TWO-PHASE FLOW MODEL

机译：两相流模型模拟的海上结构上的水动力波载荷

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The numerical simulation of hydrodynamic wave loading on different types of offshore structures is important to predict forces on and water motion around these structures. This paper presents a numerical study of two-phase flow over a sloping bottom with the presence of breaking waves.rnThe details of the numerical model, an improved Volume Of Fluid (iVOF) method, are presented in the paper. The program has been developed initially to study the sloshing of liquid fuel in satellites. This micro-gravity environment requires a very accurate and robust description of the free surface. Later, the numerical model has been used for calculations of green water loading and the analysis of anti-roll and sloshing tanks, including the coupling with ship motions. The model has been extended recently to take two-phase flow effects into account. Two-phase flow effects are particularly important near the free surface, where loads on offshore structures strongly depend on the interaction between different phases like air and water. Entrapment of air pockets and entrainment of bubble clouds have a cushioning effect on breaking wave impacts.rnThe velocity field around the interface of air and water, being continuous across the free surface, requires special attention. By using a newly-developed gravity-consistent discretisation, spurious velocities at the free surface are prevented. Thus far, the second air phase has been treated as incompressible. Taking compressibility effects into account requiresrna pressure-density relation for grid cells containing air. The expansion and compression of air pockets is considered as an adiabatic process.rnThe numerical model is validated on several test cases. In this paper special attention will be paid to the impact of a breaking wave over a sloping bottom.
机译：在不同类型的海上结构上进行水动力波载荷的数值模拟对于预测这些结构上的力和水运动很重要。本文对存在倾斜波的倾斜底部两相流动进行了数值研究。rn本文介绍了数值模型的详细内容，即改进的流体体积（iVOF）方法。该程序最初是为了研究卫星中液体燃料的晃动而开发的。这种微重力环境要求对自由表面进行非常准确和可靠的描述。后来，该数值模型被用于计算绿水负荷，并分析防倾水和晃荡水箱，包括与船舶运动的耦合。该模型最近进行了扩展，以考虑到两相流效应。两相流效应在自由表面附近尤为重要，因为在海上自由结构上的载荷在很大程度上取决于空气和水等不同相之间的相互作用。气泡的夹带和气泡云的夹带对破碎波的冲击具有缓冲作用。rn围绕空气和水的速度场在自由表面上是连续的，需要特别注意。通过使用新开发的重力一致离散，可以防止自由表面的杂散速度。到目前为止，第二空气相已被视为不可压缩的。考虑到压缩性的影响，对于包含空气的网格单元，需要压力-密度关系。气袋的膨胀和压缩被认为是绝热过程。数值模型在几个测试案例中得到了验证。在本文中，将特别注意破碎波对倾斜底部的影响。

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