Dynamics of Jet Mixing Layer

将用大量的热线探头进行实验，以诊断湍流射流的相干结构内容。来自这些探头的同时信号将被用来通过从适当的正交分解(POD)推断的模式以及动态模式相互作用来创建流动的实验重建。这将与由现有非同步数据结合建模构建的POD分解进行比较，以推断后一种方案中使用的模型的质量。数据还将受到各种条件采样方案的影响，以评估这些方案捕获相干结构的能力。这项研究的目的是评估各种现有的和拟议的方案，以实验提取湍流的相干内容。目前，由于缺乏关于这些结构的可靠信息，此类流动的预测性建模受到阻碍。

An experiment is to be conducted with a very large number of hotwire probes to diagnose the coherent structure content of a turbulent jet. Simultaneous signals from these probes wiol be utilized to create an experimental reconstruction of the flow by way of the modes inferred from a Proper Orthogonal Decomposition (POD), as well as the dynamical mode interaction. This will be compared to a POD decomposition constructed from existing nonsimultaneous data combined with modeling, to infer the quality of the model used in this latter scheme. The data will also be subjected to various conditional sampling schemes to evaluate the ability of such schemes to capture coherent structures. The research is aimed at evaluating various existing and proposed schemes to experimentally extract the coherent content of turbulent flows. Predictive modeling of such flows is presently handicapped by lack of reliable information on these structures.