This study compares the predicted synthetic flow fields generated based on the representative structures of the attached eddy model to experimental data captured using Particle Image Velocimetry of a turbulent boundary layer. To this end, wall-parallel and cross-stream planar fields are analyzed qualitatively and quantitatively by examining instantaneous flow features and by statistical two-point correlation functions, respectively. Our results reveal that although single-point flow statistics are in good agreement with the experimental data, a comparison of instantaneous flow fields and multipoint statistics between the attached eddy model and experiments shows differences in the spatial coherence. Based on these observations, a modification to the placement of the representative eddies in the attached eddy model is proposed that incorporates the meandering of these flow structures, which has been extensively reported in turbulent boundary layers. Our results reveal that this subtle modification provides a superior spatial representation of a turbulent boundary layer from the attached eddy model by reducing periodic effects and the overestimated spatial coherence. Similar improvements are also reported for the spatial representation of the spanwise velocity component.

中文翻译：

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从附加的涡流模型获得边界层的改进空间表示

这项研究将基于附着涡模型的代表性结构生成的预测合成流场与使用湍流边界层的粒子图像测速仪捕获的实验数据进行了比较。为此，分别通过检查瞬时流量特征和统计两点相关函数来定性和定量地分析壁平行和横流平面场。我们的结果表明，尽管单点流动统计数据与实验数据非常吻合，但对附加涡流模型和实验之间的瞬时流场和多点统计数据的比较显示出空间相干性的差异。基于这些观察，提出了对代表性涡流在附加涡流模型中的位置的修改，该修改结合了这些流动结构的曲折，这在湍流边界层中已得到广泛报道。我们的结果表明，这种微妙的修改通过减少周期性影响和高估了的空间相干性，为附着的涡流模型提供了湍流边界层的出色空间表示。对于翼展速度分量的空间表示，也报告了类似的改进。我们的结果表明，这种微妙的修改通过减少周期性影响和高估了的空间相干性，为附着的涡流模型提供了湍流边界层的出色空间表示。对于翼展方向速度分量的空间表示，也报告了类似的改进。我们的结果表明，这种微妙的修改通过减少周期性影响和高估了的空间相干性，为附着的涡流模型提供了湍流边界层的出色空间表示。对于翼展速度分量的空间表示，也报告了类似的改进。