Study of The Fundamental Dynamics of Water Wave Effects on Turbulence for Environmental Applications

PI：沈，连建议编号：1605080拟议的研究集中在靠近朗缪尔池的流动结构附近产生的湍流的研究。这些是出现在海洋和湖泊中的水平反向旋转的大漩涡对，它们在风和波浪方向上对齐。它们在许多环境问题上发挥着重要作用，包括海上石油泄漏的运输，温室气体在大气和海洋之间的转移，以及影响水生生态系统的湖泊中的运输和混合过程。提出了用大涡模拟(LES)模式来捕捉和理解朗缪尔环流的动力学和形成过程，其中数值网格不断地适应水面的变形。这是对这种流动建模的一步改变，因为当前的模拟和现有的理论，如Craik-Leibovich(C-L)模型，假设界面平坦，简化了流动。其目标是直接捕捉朗缪尔细胞的形成和演化，而不需要简化(C-L)模型。详细的流场描述将被用来研究朗缪尔池中湍流涨落和涡动力学的基本机制，并在此基础上对C-L理论进行修正和更新。这项研究可能会影响我们对海上漏油运输、温室气体在大气和海洋之间的转移以及湖泊中影响水生生态系统的运输和混合过程的理解。作为该项目教育范围的一部分，美国原住民高中生将通过参加由国际和平协会联合组织的夏令营活动来了解环境流体力学。

PI: Shen, LianProposal Number: 1605080The proposed research is focused on the study of turbulence generated close to the flow structures known as Langmuir cells. These are pairs of large, horizontal counter-rotating vortices that appear in the ocean and in lakes and are aligned in the wind and wave direction. They play an important role in many environmental problems including the transport of oil spills at sea, transfer of greenhouse gases between the atmosphere and oceans, and the transport and mixing processes in lakes that affect aquatic ecosystems. It is proposed to use Large Eddy Simulation (LES) models, where the numerical mesh continuously adopts to the water surface deformation, to capture and understand the dynamics and the process of formation of Langmuir cells. This is a step change in modeling such flows, since current simulations and existing theories, like the Craik-Leibovich (C-L) model, simplify the flow assuming flat interfaces. The goal is to capture the formation and evolution of Langmuir cells directly, without the simplifications of the (C-L) model. Detailed descriptions of the flow field will be used to investigate the fundamental mechanisms of turbulence fluctuations and vortex dynamics in Langmuir cells, based on which the C-L theory will be corrected and updated. This research could impact our understanding of transport of oil spills at sea, transfer of greenhouse gases between the atmosphere and oceans, and the transport and mixing processes in lakes that affect aquatic ecosystems. As part of the educational scope of the project, Native American high school students will be introduced to environmental fluid mechanics through their participation in summer camp activities co-organized by the PI.