UNS: Strained Turbulence and Mixing in Flows of a conducting fluid in a magnetic field

UNS：磁场中导电流体流动中的应变湍流和混合

• 批准号: 1510749
• 负责人: Pui-Kuen Yeung
• 金额: $ 30.04万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1510749&HistoricalAwards=false
• 关键词: UNS; Strained; Turbulence; Mixing; Flows

1510749(Yeung)The goal of this proposal is to investigate effects of magnetic forces in turbulent flows that occur in manufacturing processes where liquid metals are involved.High fidelity simulations will be utilized, since experiments in these physical systems with liquid metals are not feasible. The proposed research is expected to have a longer term impact on manufacturing, a research area of National interest, for example in the production of aluminum that involves electrical currents that melt the ore), as well as magnetic fields.The objectives of the proposed research are to pursue fundamental advances in the study of turbulent flow of an electrically conducting fluid in a uniform magnetic field, in the low-magnetic-Reynolds number regime. Numerical simulations of high fidelity (i.e., direct numerical simulations, DNS) of turbulent flows will be utilized to study the magnetohydrodynamic (MHD) phenomena that are important in this physical situation and the effects of the Lorentz force of electromagnetic induction on flow development and on mixing. The nature of MHD turbulence is not sufficiently understood - very little experimental data are available. Simulations of passive scalar fields are proposed to provide insights on time scales of mixing and relaxation from different initial conditions. The proposed DNS would provide results to model the Reynolds stress tensor accounting for the Joule dissipation effect and to close the turbulence equations for lower-order modeling. In addition, a training activity is proposed to recent initiatives in a summer internship program specifically targeted towards undergraduate students with disabilities, to be selected from a national pool of applicants through working closely with the American Association for the Advancement of Science. Selected high school teachers from the Atlanta area participating in a summer program will be encouraged to incorporate elements of the science into high-school physics curricula.

1510749(Yeung)该提案的目标是研究涉及液态金属的制造过程中发生的湍流中磁力的影响。将利用高保真度模拟，因为在这些液态金属物理系统中进行实验是不可行的。拟议的研究预计将对制造业产生长期影响，这是国家利益的研究领域，例如涉及熔化矿石的电流的铝生产以及磁场。拟议研究的目标是在低磁雷诺数范围内的均匀磁场中导电流体的湍流研究中取得根本性进展。湍流的高保真度数值模​​拟（即直接数值模拟，DNS）将用于研究在这种物理情况下很重要的磁流体动力学（MHD）现象以及电磁感应洛伦兹力对流动发展和混合的影响。 MHD 湍流的性质尚未得到充分了解 - 可用的实验数据很少。提出了无源标量场的模拟，以提供对不同初始条件下混合和弛豫时间尺度的见解。所提出的 DNS 将提供结果来对考虑焦耳耗散效应的雷诺应力张量进行建模，并闭合低阶建模的湍流方程。此外，还针对最近专门针对残疾本科生的暑期实习计划倡议提出了一项培训活动，该计划将通过与美国科学促进会密切合作从全国申请人库中选出。将鼓励来自亚特兰大地区参加暑期项目的选定高中教师将科学元素纳入高中物理课程。