Direct Phase-Resolved Simulation of Wind-Waves

风波的直接相位解析模拟

• 批准号: 1341063
• 负责人: Lian Shen
• 金额: $ 19.52万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-03-18 至 2017-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1341063&HistoricalAwards=false
• 关键词: Direct; Phase; Resolved; Simulation; Wind

Intellectual merit: The wind-wave problem is a classic subject in physical oceanography and fluid mechanics with many important applications. The objective of this study is to develop a wave-phase-resolved numerical capability for the simulation of wind-waves under moderate sea conditions, to investigate the interaction between the wind and waves, to effectively capture the effect of wave breaking dissipation in the wave simulation, and to perform simulation-based study of the dynamic evolution of wind-waves. The study aims at establishing a framework for physics-based fine-resolution simulation of wind-waves that can be used by theoretical, numerical, and experimental studies for model development and cross comparison.The simulation builds on a suite of advanced numerical methods including a high-order spectral method (HOSM) for nonlinear waves, large-eddy simulation (LES) with advanced subgrid-scale (SGS) models for wind turbulence on boundary-fitted grid that follows the wave motion, and, as an auxiliary tool, a hybrid multi-fluid simulation (HMFS) method for steep and breaking waves. The wind simulation will be dynamically coupled with the wave simulation with two-way interactions. From the HOSM simulation, the wave field will provide a realistic bottom boundary condition for the wind LES. Using a new dynamic SGS sea-surface roughness model, the effect of short gravity waves on the wind will be modeled without ad hoc tuning of the model coefficient. In return, the wind LES will provide wind forcing for the HOSM simulation of the waves. Using wave breaking models, which will be assessed and calibrated with the auxiliary HMFS of steep and breaking waves, wave breaking dissipation will also be taken into account in the HOSM. As such, the processes of wind input, nonlinear wave interaction, and wave breaking dissipation will all be incorporated to the phase-resolved simulation of the wave field for the first time. Systematic tests and extensive comparisons with other studies are planned in the proposed project.Some of the proposed computations, such as the wind LES over dynamically-evolving nonlinear wave field with dynamic SGS sea-surface roughness modeling, the phase-resolved simulation of nonlinear wave field with direct wind input and modeling of wave breaking dissipation, and the simulation of steep and breaking wind-waves, are the first of their kind. This study will produce detailed data of the interacting wind and wave fields in a wave-phase-resolved context, which can shed new light on the long- standing problem of wind-wave dynamics. The results of the proposed research will be useful for the comparison with experiment measurement and theoretical analysis. The simulation data will also be helpful for the development of improved models for large-scale wave-phase-averaged simulations.Broader impacts: The topic of this study is of interest to the scientific community as well as the general public. The proposed study will lead to improved simulation capability and understanding of wind-waves, which are essential to many applications including weather and climate change, operation and safety of ships and offshore structures, renewable energy, and pollutant transport. In the project, doctoral graduate education will stress multi-disciplinary training with a focus on computation of wave and turbulence problems. Graduate student recruiting and mentoring will leverage an NSF IGERT project on modeling complex systems awarded to JHU. The IGERT project places emphasis on training in high-performance computation of multi-scale multi-physics problems for domestic doctoral students, especially under-represented minorities, women, and first-generation students. Educational outreach will be facilitated by the Center for Educational Outreach at JHU, through which the PI will work with local Baltimore high schools to expose high school students, especially those from underserved communities, to university research and to inspire them to pursue higher education and careers in science and engineering.

智力优点：风波问题是具有许多重要应用的物理海洋学和流体力学中的经典主题。这项研究的目的是开发波相分辨的数值能力，以在中等海洋条件下模拟风波，研究风与波之间的相互作用，以有效地捕获波浪仿真中波浪破裂耗散的影响，并对基于模拟的风波动力学进化进行基于模拟的研究。该研究旨在建立一个基于物理学的风波的精细分辨率模拟框架，该框架可以通过理论，数值和实验研究用于模型开发和交叉比较。该模拟建立在一套高级数值方法的套件上遵循波动运动的边界拟合网格，作为辅助工具，用于陡峭和破裂波的混合多流体模拟（HMFS）方法。风模拟将与波动模拟与双向相互作用动态耦合。从HOSM模拟中，波场将为风LE提供现实的底部边界条件。使用新的动态SGS海面粗糙度模型，短重力波对风的影响将在不临时调整模型系数的情况下进行建模。作为回报，风LES将为波浪模拟提供强力。使用波浪破裂模型，将通过陡峭和断裂波的辅助HMF进行评估和校准，在HOSM中还将考虑波浪破裂耗散。因此，首次将风输入，非线性波相互作用和波浪破坏耗散的过程首次纳入波场的相分辨模拟。 Systematic tests and extensive comparisons with other studies are planned in the proposed project.Some of the proposed computations, such as the wind LES over dynamically-evolving nonlinear wave field with dynamic SGS sea-surface roughness modeling, the phase-resolved simulation of nonlinear wave field with direct wind input and modeling of wave breaking dissipation, and the simulation of steep and breaking wind-waves, are the first of their kind.这项研究将在波相分辨的环境中产生相互作用的风和波场的详细数据，这可以使人们对风波动力学的长期存在问题发明新的启示。拟议研究的结果将有助于与实验测量和理论分析进行比较。模拟数据还将有助于开发改进的大规模波相平均模拟模型。Boader的影响：这项研究的主题对科学界和公众都感兴趣。拟议的研究将导致改进的模拟能力和对风波的理解，这对于许多应用至关重要，包括天气和气候变化，船舶和近海结构的操作和安全性，可再生能源以及污染物的运输。在该项目中，博士研究生教育将强调多学科培训，重点是计算波浪和湍流问题。研究生招聘和指导将利用NSF IGERT项目来建模授予JHU的复杂系统。 Igert项目重点是为国内博士学生，尤其是代表性不足的少数群体，妇女和第一代学生培训多规模多物理问题的高性能计算培训。 JHU的教育外展中心将促进教育外展活动，PI将与当地的巴尔的摩高中合作，以揭露高中生，尤其是来自服务不足的社区的学生，向大学研究，并激发他们从事科学和工程领域的高等教育和职业。