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首页> 外文期刊>Marine Structures >Validation and application of nonlinear hydrodynamics from CFD in an engineering model of a semi-submersible floating wind turbine
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Validation and application of nonlinear hydrodynamics from CFD in an engineering model of a semi-submersible floating wind turbine

机译：基于半潜水浮动风力涡轮机工程模型中CFD非线性流体动力学的验证与应用

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摘要

Nonlinear hydrodynamics play a significant role in accurate prediction of the dynamic responses of floating wind turbines (FWTs), especially near the resonance frequencies. This study investigates the use of computational fluid dynamics (CFD) simulations to improve an engineering model (based on potential flow theory with Morison-type drag) by modifying the second-order difference-frequency quadratic transfer functions (QTFs) and frequency-dependent added mass and damping for a semi-submersible FWT. The results from the original and modified engineering models are compared to experimental data from decay tests and irregular wave tests. In general, the CFD results based on forced oscillation tests suggest increasing the frequency-depending added mass and damping at low frequencies compared to first order potential flow theory. The modified engineering model predicts natural periods close to the experimental results in decay tests (within 5%), and the underprediction of the damping is reduced compared to the original engineering model. The motions, mooring line tensions and tower-base loads in the lowfrequency response to an irregular wave are underestimated using the original engineering model. The additional linear damping increases this underestimation, while the modified QTFs based on CFD simulations of a fixed floater in bichromatic waves result in larger differencefrequency wave loads. The combined modifications give improved agreement with experimental data in terms of damage equivalent loads for the mooring lines and tower base.
机译：非线性流体动力学在浮动风力涡轮机（FWT）的动态响应的精确预测中起着重要作用，特别是在谐振频率附近。本研究通过修改二阶差分频率二次传输函数（QTFS）来调查计算流体动力学（CFD）模拟来改善工程模型（基于潜在流动理论的潜在流动理论），并添加频率依赖性半潜水FWT的质量和阻尼。将原始和修改工程模型的结果与来自衰减测试和不规则波试验的实验数据进行比较。通常，基于强制振荡测试的CFD结果表明与第一阶电位流理论相比，基于强制振荡测试的频率取决于频率依赖性增加的质量和阻尼。改进的工程模型预测衰减试验中实验结果（在5％之内）接近实验结果的自然时期，与原始工程模型相比，阻尼的潜在欠压。使用原始工程模型低估了低频率对不规则波的低频率响应的动作，系泊线张力和塔基载荷。附加线性阻尼增加这种低估，而基于在双色波中的固定浮动的CFD模拟的修改QTF导致较大的偏差波负荷。组合修改在系泊线和塔基底座的损坏等同载荷方面提供了改进的同步。

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