Dynamics of Vortex Sheets

涡流片动力学

• 批准号: 9311811
• 负责人: Dale Pullin
• 金额: $ 23.66万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9311811&HistoricalAwards=false
• 关键词: Dynamics; Vortex; Sheets

9311811 Pullin An investigation will be carried out of the relation between small scale vortex structures and the large scale energy containing eddies typical of turbulence. A model of this relationship has been developed and is to be extended and applied. The approach is through small scale vortices which can be re-oriented, stretched, or compressed driven by the distortions of the large scale motion. A Large Eddy Simulation model results from this approach. It will be tested against Direct Numerical Simulations of turbulent channel flow. This research is an attempt to use the known deterministic governing equations as a basis for turbulence models, rather than ad hoc closure assumptions. This can lead to a more reliable turbulent flow modeling capability with greater range of applicability. ***

小行星9311811 将对小尺度涡旋结构与湍流典型的大尺度含能涡旋之间的关系进行研究。这种关系的一个模型已经建立，并将得到推广和应用。该方法是通过小尺度涡，可以重新定向，拉伸，或压缩驱动的大尺度运动的扭曲。 一个大涡模拟模型的结果，从这种方法。它将针对湍流槽道流的直接数值模拟进行测试。 这项研究是一种尝试，使用已知的确定性控制方程作为湍流模型的基础，而不是特设的封闭假设。这可以导致具有更大适用范围的更可靠的湍流建模能力。 ***