Collaborative Research: Sediment Transport in Oscillating Turbulent Boundary Layers

合作研究：振荡湍流边界层中的沉积物输送

• 批准号: 0351443
• 负责人: Kenneth Kiger
• 金额: $ 32.44万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-15 至 2008-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0351443&HistoricalAwards=false
• 关键词: Collaborative; Research; Sediment; Transport; Oscillating

0351667/0351443A closely integrated numerical and experimental investigation of sediment transport mechanisms within turbulent oscillatory boundary layer flows will be conducted. The study will complement and extend the existing knowledge base through a focus on understanding the micromechanics of the transport process. The idea is to apply to the problem at hand techniques that have been developed during the last decade in the engineering community to study turbulent particle laden flows. On the numerical side, this will be done through the novel use of a combined Eulerian/Lagrangian Direct Numerical Simulation and Large Eddy Simulation of the fluid/particle motion using an immersed boundary technique and a two-fluid collisional wall model for the mobile sediment bed. The numerical modeling for the fluid phase will be done in conjunction with a Lagrangian based approach for the particulate phase to study the behavior, at the individual particle level, of the sediment entrainment mechanisms as well as the modification induced by the particles on the turbulence of the fluid phase. For the experiments, recent innovations in two-phase Particle Image Velocimetry techniques, pioneered in our laboratory, will be applied to provide detailed, instantaneous, spatially resolved measurements of both the fluid and the sediment phase within an oscillatory boundary layer water channel. The challenge is to adapt these techniques to the scales and parameter range encountered in the ocean.Broader ImpactsThe motion of sediments over the continental shelf is an important topic in coastal studies. Examples of applications include transport of particulate organic matter and man-made contaminants; prediction of the optical properties of the water column; evaluation of burial rates of archaeological artifacts; prediction of coastal flooding and erosion; evaluation of habitat of commercial fisheries; and the design of intakes and outfalls of sewage treatment plant and cooling systems. The development of a state-of-the-art experimental facility with a wide range of potential applications will open research possibilities in other areas, and foster further interdisciplinary collaborations. The development of a numerical tool incorporating the most advanced numerical techniques for the solution of two-phase wall-bounded turbulent flows will allow new insight of the process. The graduate students and a post-doc trained in this project will be exposed to advanced numerical and experimental techniques, within an exciting interdisciplinary environment. Finally, The output from model and experiments will be included in the teaching portfolio of the investigators.

0351667/0351443A将进行湍流振荡边界层流动中泥沙输运机制的紧密结合的数值和实验研究。该研究将通过重点了解运输过程的微观力学来补充和扩展现有的知识基础。这个想法是将过去十年来在工程界发展起来的技术应用于手头的问题，这些技术用于研究湍流粒子负载流。在数值方面，这将通过结合欧拉/拉格朗日直接数值模拟和流体/颗粒运动的大涡模拟的新方法来完成，该模拟使用浸入边界技术和移动沉积物床的双流体碰撞壁模型。流体相的数值模拟将与基于拉格朗日的颗粒相方法结合进行，以研究单个颗粒水平上沉积物夹带机制的行为以及颗粒对流体相湍流引起的修改。在实验中，我们实验室首创的两相粒子图像测速技术的最新创新将应用于提供振荡边界层水道内流体和沉积物相的详细、瞬时、空间分辨测量。挑战在于使这些技术适应海洋中遇到的尺度和参数范围。更广泛的影响沉积物在大陆架上的运动是海岸研究中的一个重要课题。应用的例子包括微粒有机物质和人为污染物的运输；水柱光学性质的预测；考古文物埋藏率的评价海岸洪水和侵蚀预报；商业渔业生境评价；污水处理厂的进、出口及冷却系统的设计。发展具有广泛潜在应用的最先进的实验设施将为其他领域的研究开辟可能性，并促进进一步的跨学科合作。数值工具的发展结合了最先进的数值技术来解决两相壁界湍流，将使人们对这一过程有新的认识。在这个项目中培养的研究生和博士后将在一个令人兴奋的跨学科环境中接触到先进的数值和实验技术。最后，模型和实验的结果将被纳入研究者的教学作品集。