VALIDATION OF WAVE RUN-UP CALCULATION METHODS FOR A GRAVITY BASED STRUCTURE
VALIDATION OF WAVE RUN-UP CALCULATION METHODS FOR A GRAVITY BASED STRUCTURE
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DOI：
10.1115/omae2008-57625
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
D. Danmeier;R. Seah;T. Finnigan;D. Roddier;Alexia Aubault;M. Vaché;J. Imamura
中科院分区：
文献类型：
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作者：
D. Danmeier;R. Seah;T. Finnigan;D. Roddier;Alexia Aubault;M. Vaché;J. Imamura
在恶劣环境下重力基础结构（GBS）的设计过程中，必须考虑在操作和极端天气条件下的最大波浪爬高。线性绕射理论和经验修正系数通常用于项目的早期设计阶段，其中波浪爬高是一个问题。当项目接近最终设计时，通常使用模型试验来评估波浪爬高和气隙要求。本文讨论了使用替代方法预测约100米水深的GBS周围的爬高。从二阶衍射代码（WAMIT）和一个完全非线性的计算流体动力学程序（ComFLOW）的结果进行了比较，以评估非线性的重要性，这取决于入射波的陡度和波长。扩展衍射理论到二阶显着改善线性预测，并产生更现实的空间模式的最大助跑。然而，需要CFD模拟来准确预测与非常陡峭的入射波和高度非线性特性相关的爬高。除了规则波计算外，线性和二阶势流计算也与不规则海浪的模型试验结果进行了比较。
During the design of a Gravity-Base Structure (GBS) for harsh environments, it is essential to account for the maximum wave run-up in operational and extreme weather conditions. Linear diffraction theory and empirical correction factors are typically used in the early design phase of a project in which wave run-up is a concern. As the project nears final design, model tests are usually used to assess wave run-up and air gap requirements. This paper addresses the use of alternative methods for prediction of run-up around a GBS in approximately 100 m water depth. Results from a second-order diffraction code (WAMIT) and a fully nonlinear CFD program (ComFLOW) are compared to assess the importance of nonlinearities, which are shown to depend on incident wave steepness and wavelength. Extending diffraction theory to second-order significantly improves linear predictions and produces more realistic spatial patterns of maximum run-up. However CFD simulations are required to accurately predict run-up associated with very steep incident waves and highly nonlinear characteristics. In addition to regular wave computations, linear and second-order potential flow calculations are also compared against model test results for an irregular sea.Copyright © 2008 by ASME