Vortical Structures in Turbulent Shear Flows and Their Implications for Subgrid Scale Modelling.

湍流剪切流中的涡流结构及其对亚网格尺度建模的影响。

• 批准号: 9221023
• 负责人: James Wallace
• 金额: $ 36万
• 依托单位: University of Maryland, College Park
• 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: 1993-08-01 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9221023&HistoricalAwards=false
• 关键词: Vortical; Structures; Turbulent; Shear; Flows

9221023 Wallace A combined experimental and numerical modeling investigation is to be conducted on equilibrium and non-equilibrium turbulent boundary layers. The experimental part will utilize unique multi-element hot wire probes previously developed by the investigator. The plan is to use a two-probe arrangement of these instruments to obtain two-point turbulence information which characterize spatial extent and coherence of organized turbulent structures. One of the issues to be addressed is energy transfer from small to large scales, or backscatter. The modeling component is aimed at incorporating the effects of backscatter into Large Eddy Simulation models. Concurrent Direct Numerical Simulations are to complement the experiments. Large Eddy Simulation modeling is an important predictive tool for complex turbulent flows. Many important features are still not accounted for, and more realism will permit more accurate engineering predictions. ***

小行星9221023 将对平衡和非平衡湍流边界层进行试验和数值模拟相结合的研究。实验部分将利用研究人员以前开发的独特的多元素热线探头。该计划是使用这些仪器的两个探头的安排，以获得两点湍流信息的特点的空间范围和有组织的湍流结构的连贯性。要解决的问题之一是从小尺度到大尺度的能量转移，或反向散射。建模组件的目的是将后向散射的影响纳入大涡模拟模型。 并行直接数值模拟是对实验的补充。 大涡模拟是复杂湍流流动的重要预测工具。许多重要的特征仍然没有得到解释，更多的现实主义将允许更准确的工程预测。 ***