Spatial input-output analysis of large-scale structures in actuated turbulent boundary layers
Spatial input-output analysis of large-scale structures in actuated turbulent boundary layers
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DOI：
10.2514/6.2021-2873
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Chang Liu;I. Gluzman;Mitchell Lozier;S. Midya;S. Gordeyev;F. Thomas;D. Gayme
中科院分区：
文献类型：
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作者：
Chang Liu;I. Gluzman;Mitchell Lozier;S. Midya;S. Gordeyev;F. Thomas;D. Gayme
本文发展了一种空间输入输出方法来研究受局部单频激励的湍流边界层动力学。该方法利用单向空间积分将问题转化为空间演化方程。该技术是用来检查在给定的时间频率的局部周期性驱动的效果，基于一个实验装置，其中一个积极的大规模被引入到湍流边界层的外层。首先，与从空间输入输出分析获得的锁相模态速度场相关的大尺度结构与基于热线测量计算的结构紧密匹配。然后，该方法被用来进一步调查的响应的边界层合成生成的大规模。象限轨迹分析表明，空间输入输出响应产生的剪切应力分布与那些在规范的壁有界湍流湍流湍流的顺序和观察到的事件的类型。还观察到不同象限行为的优势与致动频率之间的预期对应关系。这些结果突出了空间输入-输出框架的承诺，用于分析驱动壁边界湍流湍流结构的形成和流向演变。
This paper develops a spatial input–output approach to investigate the dynamics of a turbulent boundary layer subject to a localized single frequency excitation. This method uses one-way spatial integration to reformulate the problem in terms of spatial evolution equations. The technique is used to examine the effect of localized periodic actuation at a given temporal frequency, based on an experimental set-up in which an active large-scale is introduced into the outer layer of a turbulent boundary layer. First, the large-scale structures associated with the phase-locked modal velocity field obtained from spatial input-output analysis are shown to closely match those computed based on hot-wire measurements. The approach is then used to further investigate the response of the boundary layer to the synthetically generated large-scale. A quadrant trajectory analysis indicates that the spatial input-output response produces shear stress distributions consistent with those in canonical wall-bounded turbulent flows in terms of both the order and types of events observed. The expected correspondence between the dominance of different quadrant behavior and actuation frequency is also observed. These results highlight the promise of a spatial input-output framework for analyzing the formation and streamwise evolution of structures in actuated wall-bounded turbulent flows.