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Wave-current interaction effects on waves and their loads on a vertical cylinder
Coastal Engineering ( IF 4.2 ) Pub Date : 2021-01-06 , DOI: 10.1016/j.coastaleng.2020.103832
Amin Ghadirian , Malene Hovgaard Vested , Stefan Carstensen , Erik Damgaard Christiensen , Henrik Bredmose

This paper uses a novel approach to investigate the effect of wave-current interactions on the wave loads on a vertical surface piercing cylinder in representative current and wave conditions in the North Sea wind farms. We used an iterative method in the experiments to ensure the same nominal sea states at the location of the installed cylinder in different current conditions for each sea state. While earlier studies have focused on the current effect on crest statistics, we here look at the force statistics. With using a first-principle engineering model, the representative force coefficients for all of the cases were computed. The force coefficients for the cases with current are consistently smaller than the cases without current. In the investigation of the measured force distribution in depth, at the time of the peak force, we observed that the force distribution of opposing currents cases were concentrated closer to the free surface compared to the cases with no and following currents. Using the harmonic separation method, the surface elevation time series of waves on following current and the inline force time series of waves on the no-current cases were the most linear while the surface elevation time series of waves on the opposing current were the most nonlinear. The consequence of neglecting different wave-current interaction effects in calculation of wave loads was investigated and it was observed that the most significant effect is the change of the force coefficients in presence of currents.



中文翻译:

波流相互作用对波及其在垂直圆柱体上的载荷的影响

本文采用一种新颖的方法来研究在北海风电场中有代表性的电流和波浪条件下,波浪-电流相互作用对垂直表面穿孔圆柱体上波浪载荷的影响。我们在实验中使用了一种迭代方法,以确保在每种海况的当前条件不同的情况下,已安装气缸的位置处的名义海况相同。虽然较早的研究集中于当前对波峰统计的影响,但我们在这里查看力的统计。使用第一原理工程模型,计算了所有情况下的代表性力系数。有电流情况下的力系数始终小于无电流情况下的力系数。在调查测得的深度力分布时,在达到峰值力时,我们观察到,与没有电流和跟随电流的情况相比,反向电流情况的力分布集中在自由表面附近。使用谐波分离法,跟随电流上的波的表面高度时间序列和无电流情况下的内力波的时间序列是最线性的,而反向电流上的波的表面高度时间序列是最非线性的。 。研究了在计算波浪荷载时忽略不同波浪-电流相互作用效应的结果,发现最显着的影响是存在电流时力系数的变化。使用谐波分离法,跟随电流上的波的表面高度时间序列和无电流情况下的内力波的时间序列是最线性的,而相反电流上的波的表面高度时间序列是最非线性的。 。研究了在计算波浪荷载时忽略了不同的波浪-电流相互作用效应的结果,发现最显着的影响是存在电流时力系数的变化。使用谐波分离法,跟随电流上的波的表面高度时间序列和无电流情况下的内力波的时间序列是最线性的,而反向电流上的波的表面高度时间序列是最非线性的。 。研究了在计算波浪荷载时忽略了不同的波浪-电流相互作用效应的结果,发现最显着的影响是存在电流时力系数的变化。

更新日期:2021-02-15
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