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

主要研究者：沈连标编号：1605080拟议的研究重点是研究靠近称为朗缪尔细胞的流动结构产生的湍流。这些是成对的大的，水平反向旋转的漩涡，出现在海洋和湖泊中，并在风和波浪的方向对齐。它们在许多环境问题中发挥着重要作用，包括海上溢油的迁移、大气和海洋之间温室气体的转移以及影响水生生态系统的湖泊中的迁移和混合过程。本文提出采用大涡模拟（LES）模型，通过数值网格不断适应水面的变形，来捕捉和理解朗缪尔胞的动态和形成过程。这是模拟这种流动的一个步骤，因为当前的模拟和现有的理论，如Craik-Leibovich（C-L）模型，简化了假设平坦界面的流动。我们的目标是直接捕捉的形成和发展的朗缪尔细胞，没有简化的（C-L）模型。详细的流场描述将被用来研究朗缪尔池中湍流脉动和涡动力学的基本机制，在此基础上，C-L理论将被修正和更新。这项研究可能会影响我们对海上石油泄漏的运输，大气和海洋之间温室气体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的理解。 作为该项目教育范围的一部分，美国原住民高中学生将通过参加PI共同组织的夏令营活动了解环境流体力学。

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.