The flow around a surface mounted cube with incoming turbulent or laminar boundary layer has been topic of many experimental and numerical investigations in the past decades. Despite its simple geometry the flow generates a set of complex vortical structures in front and around the cube, includes flow separation at the three front plane edges with corresponding subsequent shear layer dynamics enveloping recirculation zones. Downstream of the cube a large unsteady flow separation region is present which is associated with typical quasi-periodic bluff-body wake dynamics. Therefore the flow configuration is well suited to enhance the understanding of similar unsteady and separated flow phenomena in many aerodynamic and engineering applications. In the present experimental investigation we aim at resolving a large spectrum of spatial and temporal scales in the flow around a cube with incoming laminar and turbulent boundary layers by using the most recent developments of dense 3D Lagrangian particle tracking (LPT) and high resolution TR-PIV for Reynolds numbers based on cube size in the range $$\text {Re}_H = U_\infty \,H\,\nu ^{-1} = 2000 - 8000$$ . The results documented in the present paper consist of snapshots and the analysis of long time-series of highly resolved 3D and 2D velocity fields suited to enhance the understanding of coherent structure dynamics and of corresponding statistical Lagrangian and Eulerian flow properties. Premultiplied velocity spectra and 3D pressure distributions are calculated and discussed as well. Finally, the measurement data is compared to results obtained with a simulation based on the lattice Boltzmann method (LBM).

中文翻译：

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表面贴装立方体周围的流动：时间分辨 PIV、3D Shake-The-Box 和 LBM 模拟的表征

在过去的几十年中，具有传入湍流或层流边界层的表面安装立方体周围的流动一直是许多实验和数值研究的主题。尽管其几何形状简单，但流动会在立方体的前面和周围产生一组复杂的涡旋结构，包括在三个前平面边缘处的流动分离以及相应的后续剪切层动力学包围再循环区。在立方体的下游存在一个大的非定常流动分离区域，它与典型的准周期性钝体尾流动力学有关。因此，流动配置非常适合增强对许多空气动力学和工程应用中类似的不稳定和分离流动现象的理解。在目前的实验研究中，我们的目标是通过使用密集 3D 拉格朗日粒子跟踪 (LPT) 和高分辨率 TR-基于立方体大小的雷诺数 PIV，在 $$\text {Re}_H = U_\infty \,H\,\nu ^{-1} = 2000 - 8000$$ 范围内。本论文中记录的结果包括快照和高分辨率 3D 和 2D 速度场的长时间序列分析，适用于增强对相干结构动力学和相应统计拉格朗日和欧拉流动特性的理解。还计算和讨论了预乘速度谱和 3D 压力分布。最后，