Loading on a vertical cylinder in multidirectional waves
Loading on a vertical cylinder in multidirectional waves
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DOI：
10.1115/1.2827083
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发表时间：
1995-08
影响因子：
1.6
通讯作者：
J. Chaplin;K. Subbiah;M. B. Irani
中科院分区：
文献类型：
--
作者：
J. Chaplin;K. Subbiah;M. B. Irani
本文介绍了不规则单向和多向波浪中孤立垂直圆柱体局部和总载荷的实验室测量结果。单个波中的最大 Keulegan-Carpenter 数约为 16，最大雷诺数约为 3×10{sup 4}。结果表明，在这些条件下，现有的理论和数值模型低估了由于波传播而导致的圆柱体载荷的减少。除了使用常系数莫里森方程时预测的变化之外，还有流体动力学影响，有助于进一步减小力。与 Dena (1977) 的混合方法的比较表明，在目前的条件下，对于扩散函数 cos{sup 2s} {theta}（其中 s = 8 和 s = 2），这些减少分别在 3% 和 6% 的范围内。尽管在阻力主导的体系中规模效应可能变得更加重要，但在 Keulegan-Carpenter 数较高时，预计会出现更大幅度的减少。
This paper presents laboratory measurements of local and total loading on an isolated vertical cylinder in irregular unidirectional and multidirectional waves. Maximum Keulegan-Carpenter numbers in individual waves were about 16, and maximum reynolds numbers about 3 {times} 10{sup 4}. It is shown that in these conditions, existing theoretical and numerical models underestimate the reduction in loading on a cylinder due to wave spreading. Besides the changes that are predicted when Morison`s equation is used with constant coefficients, there are hydrodynamic influences that contribute further force reductions. Comparisons with Dena`s (1977) hybrid approach suggest that in the present conditions these reductions are in the region of 3 and 6 percent for a spreading function cos{sup 2s} {theta}, with s = 8 and s = 2, respectively. Larger reductions can be expected at higher Keulegan-Carpenter numbers, though scale effects are likely to become more important in the drag-dominated regime.