EAGER: Understanding fundamental mechanisms involved in turbulence, current and wave interactions for offshore wind-turbines

项目负责人：Bhaganagar， kiran提案编号：1348480机构：德克萨斯大学圣安东尼奥分校标题：渴望：了解海上风力涡轮机湍流、水流和波浪相互作用的基本机制由于海流和波浪诱导的强迫产生的额外载荷，与陆上风力涡轮机相比，海上风力涡轮机（WT）中的尾流-尾流相互作用相当重要。波浪对尾迹的影响一直是海上小涡设计的重要瓶颈之一。虽然风能已经发展成为一种成熟的技术，但在美国仍未实现海上小涡。为了解决这一问题，有一种强烈的动力来推进对限制风力发电场性能的关键外部因素的基本理解。在这个方向上，该项目将通过使用大涡模拟（LES）作为工具来系统地理解波浪/电流振幅强迫和风速对尾流-尾流相互作用的影响，从而解决尾流-水流-空气相互作用所涉及的挑战。当前研究的目的是确定由于波浪-电流相互作用对风力涡轮机的水动力。PI将根据动态强迫参数发展尾迹区域的平均和湍流流动的标度规律。所开发的标度定律将与现有的尾迹模型进行比较。这项研究的智力价值在于，它本质上是基础性的，因为通过理解影响小波的关键流体动力和空气动力过程的相互作用，我们将能够根据尾流区域的波/流/风的动态参数制定风速损失和湍流强度增强的标度规律。这项研究具有变革性，因为这些近海小波近尾流区域的尺度规律将首次为现有的尾流模型提供准确的参数化。本研究将促进对近海小波尾迹区以下3个基本方面的基本认识：(1)修正表面粗糙度、平均速度亏损和尾迹区湍流的标度；(2)理解波浪能量非线性响应引起的共振；(3)分离波浪产生的湍流、WT产生的湍流和风引起的湍流。这个项目更广泛的影响是它与美国的能源危机直接相关，美国迫切需要使风能更容易获得，风能是可持续能源的主要来源。这项研究的结果将提供更现实的预测工具，这将成为未来海上风电场装置的重要指导方针。作为该提案的一部分，具体的努力是鼓励更多的女性在工程领域接受教育和职业生涯。

PI: Bhaganagar, KiranProposal Number: 1348480Institution: University of Texas at San AntonioTitle: EAGER: Understanding fundamental mechanisms involved in turbulence, current and wave interactions for offshore wind-turbinesThe wake-wake interactions are quite substantial in an offshore wind turbines (WT) compared to onshore WT due to additional loading that arises due to sea current and wave-induced forcing. The effect of wave forcing on the wakes has been one of the important bottlenecks in the design of offshore WT. Though wind energy has matured to a technology, still offshore WT has not been realized in United States yet. To address this concern, there is a strong impetus to advance fundamental understanding of key external factors limiting the wind farms performance. Towards this direction, this project will address the challenges involved in the wake-current-air interactions by using large eddy simulation (LES) as a tool to systematically understand the effect of wave/current amplitude forcing and wind speed on the wake-wake interactions. The objectives of the current study are to determine the hydrodynamic forces due to the wave-current interaction on wind turbines. The PI will develop scaling laws of the mean and turbulence flow in the wake region in terms of dynamic forcing parameters. The scaling laws developed will be compared with the existing wakemodels.The intellectual merit of this study is that it is fundamental in nature as by understanding the interplay of key hydrodynamic and aerodynamic processes affecting the WT, we will be able to lay down the scaling laws of the loss of wind velocity and enhancement of turbulence intensity in terms of the dynamic parameters of wave/current/wind in the wake region. The research is transformative as these scaling laws in the near-wake region of offshore WT will provide, for the first time, accurate parameterization for the existing wake models. The present study will advance the fundamental understanding of the following 3 fundamental aspects in the wake region of offshore WT: (1) Scaling of modified surface roughness, mean velocity deficit and turbulence in the wake region (2) Understanding resonance due to the nonlinear response of the wave energy (3) Isolating the wave-generated turbulence, WT-generated turbulence and turbulence due to wind.The broader impacts of this project are its direct relevance to energy crisis in United States, where there is an urgent need to make wind energy more accessible, and a major source of sustainable form of energy. The results of this study will provide more realistic predictive tools, which will serve as important guidelines for future of offshore wind-farm installations. Specific efforts are being targeted as a part of this proposal to encourage more women to pursue education and careers in engineering.