CAREER: Non-equilibrium wall-bounded turbulent flows at high Reynolds numbers

职业：高雷诺数下的非平衡壁面湍流

• 批准号: 1453633
• 负责人: Johan Larsson
• 金额: $ 50万
• 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: 2015
• 资助国家: 美国
• 起止时间: 2015-03-01 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1453633&HistoricalAwards=false
• 关键词: CAREER; Non; equilibrium; wall; bounded

1453633LarssonEven though the majority of flows in industry and in the environment are turbulent, significant gaps exist in our knowledge of their behavior, especially in non-canonical cases (i.e., cases where the flow is not at equilibrium). This is the white space that this CAREER proposal aims to cover -- to develop theory and models for the simulation of compressible, non-equilibrium turbulent flows with Large Eddy Simulations (LES). In addition to the scientific broader impact, educational activities are proposed that are focused on the development of a new classroom software tool that can be used to provide experiential learning to undergraduate and graduate students by offering visual answers to fluid dynamics questions. The software tool would be available to other educators.The goal of this proposal is to invent new LES models that can accurately simulate the behavior of non-equilibrium turbulent flows close to solid walls (these are known as wall models). This is a critical yet missing element from currently available computational techniques, and the solution to this problem would open up a whole new area of engineering flows that we would be able to predict. The PI proposes to obtain high fidelity simulation data using direct numerical simulations of representative flow cases and then utilize these data to both develop and validate his new models. Successful completion of this project would constitute a step change in our predictive capabilities for non-equilibrium turbulent flows close to solid walls.

1453633larssoneven尽管工业和环境中的大部分流量都是动荡的，但我们对行为的了解中存在很大的差距，尤其是在非典型情况下（即，流量不处于平衡的情况下）。这是这项职业提议旨在涵盖的空白 - 开发理论和模型，以模拟具有大型涡流模拟（LES）的可压缩，非平衡湍流。除了更广泛的影响外，还提出了侧重于开发新的课堂软件工具的教育活动，该工具可用于通过为流体动力学问题提供视觉答案来提供体验式学习，以提供本科生和研究生。该提案的目的是发明可以准确模拟靠近固体壁的非平衡湍流流动的行为（这些称为墙模型）的新LES模型的目标。这是当前可用的计算技术中关键但缺失的元素，解决此问题的解决方案将为我们能够预测的全新工程流动。 PI建议使用代表性流动案例的直接数值模拟获得高保真模拟数据，然后利用这些数据来开发和验证他的新模型。该项目的成功完成将构成我们对接近实心壁的非平衡湍流流动的预测能力的一步变化。