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首页> 外文期刊>International Journal of Heat and Fluid Flow >The effect of boundary layer fluctuations on the streamwise vortex structure in simulated plane turbulent mixing layers
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The effect of boundary layer fluctuations on the streamwise vortex structure in simulated plane turbulent mixing layers

机译：边界层波动对模拟平面湍流混合层中流向涡结构的影响

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摘要

This paper details the influence of the magnitude of imposed inflow fluctuations on Large Eddy Simulations of a spatially developing turbulent mixing layer originating from laminar boundary layers. The fluctuations are physically-correlated, and produced by an inflow generation technique. The imposed high-speed side boundary layer fluctuation magnitude is varied from a low-level, up to a magnitude sufficiently high that the boundary layer can be considered, in a mean sense, as nominally laminar. Cross-plane flow visualisation shows that each simulation contains streamwise vortices in the laminar and turbulent regions of the mixing layer. Statistical analysis of the secondary shear stress reveals that mixing layers originating from boundary layers with low-level fluctuations contain a spatially stationary streamwise structure. Increasing the high-speed side boundary layer fluctuation magnitude leads to a weakening of this stationary streamwise structure, or its removal from the flow entirely. The mixing layer growth rate reduces with increasing initial fluctuation level. These findings are discussed in terms of the available experimental data on mixing layers, and recommendations for both future experimental and numerical research into the mixing layer are made. (C) 2017 Elsevier Inc. All rights reserved.
机译：本文详细介绍了流入波动幅度对源自层状边界层的空间发展湍流混合层的大涡模拟的影响。波动是物理相关的，并且是由流入产生技术产生的。施加的高速侧边界层波动幅度从低电平变化到足够高的幅度，以至于在平均意义上可以将边界层视为名义层流。跨平面流动可视化显示，每个模拟都在混合层的层流和湍流区域中包含沿流方向的涡流。二次剪切应力的统计分析显示，源自边界层的，具有低水平波动的混合层包含空间固定的流向结构。高速侧边界层波动幅度的增加会导致这种固定的流式结构变弱，或者将其从流中完全去除。随着初始波动水平的增加，混合层的生长速率降低。将根据混合层上的可用实验数据对这些发现进行讨论，并对混合层的未来实验和数值研究提出建议。 （C）2017 Elsevier Inc.保留所有权利。

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